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Cisco IOS XR Router NDM Security Technical Implementation Guide

	Version 1 Release 2

	2020-01-24

	U_Cisco_IOS-XR_Router_NDM_STIG_V1R2_Manual-xccdf.xml

This Security Technical Implementation Guide is published as a tool to improve the security of Department of Defense (DoD) information systems. The requirements are derived from the National Institute of Standards and Technology (NIST) 800-53 and related documents. Comments or proposed revisions to this document should be sent via email to the following address: disa.stig_spt@mail.mil.

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Vulnerabilities (64)

V-96371

The Cisco router must be configured to limit the number of concurrent management sessions to an organization-defined number.

Finding ID

CISC-ND-000010

Rule ID

SV-105509r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000001-NDM-000200

CCI

CCI-000054

Target Key

(None)

Documentable

Discussion

Device management includes the ability to control the number of administrators and management sessions that manage a device. Limiting the number of allowed administrators and sessions per administrator based on account type, role, or access type is helpful in limiting risks related to DoS attacks. This requirement addresses concurrent sessions for administrative accounts and does not address concurrent sessions by a single administrator via multiple administrative accounts. The maximum number of concurrent sessions should be defined based upon mission needs and the operational environment for each system. At a minimum, limits must be set for SSH, HTTPS, account of last resort, and root account sessions.

Fix Text

Configure the router to limit the number of concurrent management sessions to an organization-defined number as shown in the example below. RP/0/0/CPU0:R3(config)#ssh server session-limit 2

Check Content

Note: This requirement is not applicable to file transfer actions such as FTP, SCP and SFTP. Review the router configuration to determine if concurrent management sessions are limited as show in the example below: ssh server session-limit 2 If the router is not configured to limit the number of concurrent management sessions, this is a finding.

V-96373

The network element must provide automated support for account management functions.

Finding ID

CISC-ND-000060

Rule ID

SV-105511r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000023-NDM-000205

CCI

CCI-000015

Target Key

(None)

Documentable

Discussion

If account management functions are not automatically enforced, an attacker could gain privileged access to a vital element of the network security architecture. Account management functions include: assignment of group or role membership; identifying account type; specifying user access authorizations (i.e., privileges); account removal, update, or termination; and administrative alerts.

Fix Text

Step 1: Configure the router to use an authentication server as shown in the following example: RP/0/0/CPU0:R3(config)#radius-server host 10.1.3.16 key xxxxxxxx Step 2: Configure the authentication order to use the authentication server as primary source for authentication as shown in the following example: RP/0/0/CPU0:R3(config)#aaa authentication login LOGIN_AUTHENTICATION group radius local Step 3: Configure all network connections associated with a device management to use an authentication server for the purpose of login authentication as shown in the following example: RP/0/0/CPU0:R3(config)#line default RP/0/0/CPU0:R3(config-line)#login authentication LOGIN_AUTHENTICATION RP/0/0/CPU0:R3(config-line)#exit RP/0/0/CPU0:R3(config)#line console RP/0/0/CPU0:R3(config-line)#login authentication LOGIN_AUTHENTICATION

Check Content

The Cisco router is not compliant with this requirement. However, the risk associated with this requirement can be fully mitigated if the router is configured to utilize an authentication server to authenticate and authorize users for administrative access. Review the router configuration to verify that the device is configured to use an authentication server as primary source for authentication as shown in the following example: radius-server host 10.1.3.16 auth-port 1645 acct-port 1646 key xxxxxxxxxx … … … aaa authentication login LOGIN_AUTHENTICATION group radius local line console login authentication LOGIN_AUTHENTICATION ! line default login authentication LOGIN_AUTHENTICATION transport input ssh If the router is not configured to use an authentication server to authenticate and authorize users for administrative access, this is a finding.

V-96375

The Cisco router must automatically remove or disable temporary user accounts after 72 hours.

Finding ID

CISC-ND-000070

Rule ID

SV-105513r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000024-NDM-000206

CCI

CCI-000016

Target Key

(None)

Documentable

Discussion

Temporary accounts are established as part of normal account activation procedures when there is a need for short-term accounts without the demand for immediacy in account activation. If temporary accounts remain active when no longer needed, they may be used to gain unauthorized access. The risk is greater for the network device since these accounts have elevated privileges. To mitigate this risk, automated termination of all temporary accounts must be set upon account creation.

Fix Text

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V-96377

The Cisco router must automatically disable accounts after a 35-day period of account inactivity.

Finding ID

CISC-ND-000080

Rule ID

SV-105515r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000025-NDM-000207

CCI

CCI-000017

Target Key

(None)

Documentable

Discussion

Since the accounts in the network device are privileged or system-level accounts, account management is vital to the security of the network device. Inactive accounts could be reactivated or compromised by unauthorized users, allowing exploitation of vulnerabilities and undetected access to the network device. This control does not apply to the account of last resort or root account. DoD prohibits local user accounts on the device, except for an account of last resort and (where applicable) a root account.

Fix Text

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V-96379

The Cisco router must be configured to enforce approved authorizations for controlling the flow of management information within the device based on control policies.

Finding ID

CISC-ND-000140

Rule ID

SV-105517r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000038-NDM-000213

CCI

CCI-001368

Target Key

(None)

Documentable

Discussion

A mechanism to detect and prevent unauthorized communication flow must be configured or provided as part of the system design. If management information flow is not enforced based on approved authorizations, the network device may become compromised. Information flow control regulates where management information is allowed to travel within a network device. The flow of all management information must be monitored and controlled so it does not introduce any unacceptable risk to the network device or data. Application-specific examples of enforcement occur in systems that employ rule sets or establish configuration settings that restrict information system services or message-filtering capability based on message content (e.g., implementing key word searches or using document characteristics). Applications providing information flow control must be able to enforce approved authorizations for controlling the flow of management information within the system in accordance with applicable policy.

Fix Text

Configure the Cisco router to restrict management access to specific IP addresses via SSH as shown in the example below. RP/0/0/CPU0:R3(config)#ipv4 access-list MANAGEMENT_NET RP/0/0/CPU0:R3(config-ipv4-acl)#permit x.x.x.0 0.0.0.255 log RP/0/0/CPU0:R3(config-ipv4-acl)#deny any log RP/0/0/CPU0:R3(config-ipv4-acl)#exit RP/0/0/CPU0:R3(config)#vty default 0 4 RP/0/0/CPU0:R3(config)#line default RP/0/0/CPU0:R3(config-line)#transport input ssh RP/0/0/CPU0:R3(config-line)#access-class MANAGEMENT_NET in RP/0/0/CPU0:R3(config-line)#end

Check Content

Review the Cisco router configuration to verify that it is compliant with this requirement. Step 1: Verify that the line vty has an ACL inbound applied as shown in the example below. line default access-class ingress MANAGEMENT_NET transport input ssh ! vty-pool default 0 4 Step 2: Verify that the ACL permits only hosts from the management network to access the router. ipv4 access-list MANAGEMENT_NET 10 permit ipv4 x.x.x.0 0.0.0.255 any log 20 deny ipv4 any any log If the Cisco router is not configured to enforce approved authorizations for controlling the flow of management information within the device based on control policies, this is a finding.

V-96381

The Cisco router must be configured to enforce the limit of three consecutive invalid logon attempts after which time lock out the user account from accessing the device for 15 minutes.

Finding ID

CISC-ND-000150

Rule ID

SV-105519r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000065-NDM-000214

CCI

CCI-000044

Target Key

(None)

Documentable

Discussion

By limiting the number of failed login attempts, the risk of unauthorized system access via user password guessing, otherwise known as brute-forcing, is reduced.

Fix Text

Check Content

V-96383

The Cisco router must be configured to display the Standard Mandatory DoD Notice and Consent Banner before granting access to the device.

Finding ID

CISC-ND-000160

Rule ID

SV-105521r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000068-NDM-000215

CCI

CCI-000048

Target Key

(None)

Documentable

Discussion

Display of the DoD-approved use notification before granting access to the network device ensures privacy and security notification verbiage used is consistent with applicable federal laws, Executive Orders, directives, policies, regulations, standards, and guidance. System use notifications are required only for access via logon interfaces with human users.

Fix Text

Configure the Cisco router to display the Standard Mandatory DoD Notice and Consent Banner before granting access as shown in the following example: RP/0/0/CPU0:R3(config)#banner login # Enter TEXT message. End with the character '#'. You are accessing a U.S. Government (USG) Information System (IS) that is provided for USG-authorized use only. By using this IS (which includes any device attached to this IS), you consent to the following conditions: -The USG routinely intercepts and monitors communications on this IS for purposes including, but not limited to, penetration testing, COMSEC monitoring, network operations and defense, personnel misconduct (PM), law enforcement (LE), and counterintelligence (CI) investigations. -At any time, the USG may inspect and seize data stored on this IS. -Communications using, or data stored on, this IS are not private, are subject to routine monitoring, interception, and search, and may be disclosed or used for any USG-authorized purpose. -This IS includes security measures (e.g., authentication and access controls) to protect USG interests--not for your personal benefit or privacy. -Notwithstanding the above, using this IS does not constitute consent to PM, LE or CI investigative searching or monitoring of the content of privileged communications, or work product, related to personal representation or services by attorneys, psychotherapists, or clergy, and their assistants. Such communications and work product are private and confidential. See User Agreement for details. # RP/0/0/CPU0:R3(config)#end

Check Content

Review the Cisco router configuration to verify that it is compliant with this requirement as shown in the example below. banner login ^C You are accessing a U.S. Government (USG) Information System (IS) that is provided for USG-authorized use only. By using this IS (which includes any device attached to this IS), you consent to the following conditions: -The USG routinely intercepts and monitors communications on this IS for purposes including, but not limited to, penetration testing, COMSEC monitoring, network operations and defense, personnel misconduct (PM), law enforcement (LE), and counterintelligence (CI) investigations. -At any time, the USG may inspect and seize data stored on this IS. -Communications using, or data stored on, this IS are not private, are subject to routine monitoring, interception, and search, and may be disclosed or used for any USG-authorized purpose. -This IS includes security measures (e.g., authentication and access controls) to protect USG interests--not for your personal benefit or privacy. -Notwithstanding the above, using this IS does not constitute consent to PM, LE or CI investigative searching or monitoring of the content of privileged communications, or work product, related to personal representation or services by attorneys, psychotherapists, or clergy, and their assistants. Such communications and work product are private and confidential. See User Agreement for details. ^C If the Cisco router is not configured to display the Standard Mandatory DoD Notice and Consent Banner before granting access to the device, this is a finding.

V-96385

Upon successful login, the Cisco router must notify the administrator of the date and time of the last login.

Finding ID

CISC-ND-000180

Rule ID

SV-105523r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000075-NDM-000217

CCI

CCI-000366

Target Key

(None)

Documentable

Discussion

Administrators need to be aware of activity that occurs regarding their network device management account. Providing administrators with information regarding the date and time of their last successful login allows them to determine if any unauthorized activity has occurred. This incorporates all methods of login, including, but not limited to, SSH, HTTP, HTTPS, and physical connectivity.

Fix Text

Check Content

V-96387

Upon successful login, the Cisco router must notify the administrator of the number of unsuccessful login attempts since the last successful login.

Finding ID

CISC-ND-000190

Rule ID

SV-105525r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000076-NDM-000218

CCI

CCI-000366

Target Key

(None)

Documentable

Discussion

Administrators need to be aware of activity that occurs regarding their network device management account. Providing administrators with information regarding the number of unsuccessful attempts made to login to their account allows them to determine if any unauthorized activity has occurred. Without this information, the administrator may not be aware that unauthorized activity has occurred. This incorporates all methods of login, including, but not limited to, SSH, HTTP, HTTPS, and physical connectivity.

Fix Text

Check Content

V-96389

The Cisco router must notify the administrator of changes to access and/or privilege parameters of the administrators account that occurred since the last logon.

Finding ID

CISC-ND-000200

Rule ID

SV-105527r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000079-NDM-000219

CCI

CCI-001395

Target Key

(None)

Documentable

Discussion

Providing administrators with information regarding security-related changes to their account allows them to determine if any unauthorized activity has occurred. Changes to the account could be an indication of the account being compromised. Hence, without notification to the administrator, the compromise could go undetected if other controls were not in place to mitigate this risk.

Fix Text

Check Content

V-96393

The Cisco router must be configured to generate audit records when successful/unsuccessful attempts to logon with access privileges occur.

Finding ID

CISC-ND-000250

Rule ID

SV-105531r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000091-NDM-000223

CCI

CCI-000172

Target Key

(None)

Documentable

Discussion

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter).

Fix Text

Configure the Cisco router to log all logon attempts as shown in the example below. RP/0/0/CPU0:R3(config)#logging buffered informational RP/0/0/CPU0:R3(config)#logging 10.1.22.2 severity info

Check Content

Review the Cisco router configuration to verify that it is compliant with this requirement. The configuration example below will log all logon attempts. logging buffered informational logging 10.1.22.2 vrf default severity info If the Cisco router is not configured to generate audit records when successful/unsuccessful attempts to logon, this is a finding.

V-96395

The Cisco router must produce audit records containing information to establish when (date and time) the events occurred.

Finding ID

CISC-ND-000280

Rule ID

SV-105533r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000096-NDM-000226

CCI

CCI-000131

Target Key

(None)

Documentable

Discussion

It is essential for security personnel to know what is being done, what was attempted, where it was done, when it was done, and by whom it was done in order to compile an accurate risk assessment. Logging the date and time of each detected event provides a means of investigating an attack; recognizing resource utilization or capacity thresholds; or identifying an improperly configured network device. In order to establish and correlate the series of events leading up to an outage or attack, it is imperative the date and time are recorded in all log records.

Fix Text

Configure the router to include the date and time on all log records as shown in the example below. RP/0/0/CPU0:R3(config)#service timestamps log datetime localtime

Check Content

Verify that the router is configured to include the date and time on all log records as shown in the configuration example below. service timestamps log datetime localtime If time stamps are not configured, this is a finding.

V-96397

The Cisco router must produce audit records containing information to establish where the events occurred.

Finding ID

CISC-ND-000290

Rule ID

SV-105535r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000097-NDM-000227

CCI

CCI-000132

Target Key

(None)

Documentable

Discussion

In order to compile an accurate risk assessment and provide forensic analysis, it is essential for security personnel to know where events occurred, such as device hardware components, device software modules, session identifiers, filenames, host names, and functionality. Associating information about where the event occurred within the network device provides a means of investigating an attack; recognizing resource utilization or capacity thresholds; or identifying an improperly configured device.

Fix Text

Configure the log-input parameter after any deny statements to provide the location as to where packets have been dropped via an ACL. RP/0/0/CPU0:R3(config)#ipv4 access-list BLOCK_INBOUND RP/0/0/CPU0:R3(config-ipv4-acl)#deny icmp any any log-input

Check Content

Review the deny statements in all ACLs to determine if the log-input parameter has been configured as shown in the example below. ipv4 access-list BLOCK_INBOUND 10 deny icmp any any log-input If the router is not configured with the log-input parameter after any deny statements to note where packets have been dropped via an ACL, this is a finding.

V-96399

The Cisco router must alert the ISSO and SA (at a minimum) in the event of an audit processing failure.

Finding ID

CISC-ND-000340

Rule ID

SV-105537r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000108-NDM-000232

CCI

CCI-000139

Target Key

(None)

Documentable

Discussion

It is critical for the appropriate personnel to be aware if a system is at risk of failing to process audit logs as required. Without this notification, the security personnel may be unaware of an impending failure of the audit capability and system operation may be adversely affected. Audit processing failures include software/hardware errors, failures in the audit capturing mechanisms, and audit storage capacity being reached or exceeded.

Fix Text

Configure the router to send log messages to the syslog server as shown in the example below. RP/0/0/CPU0:R3(config)#logging 10.1.3.22 severity info

Check Content

The Cisco router is not compliant with this requirement. However, the risk associated with this requirement can be fully mitigated if the router is configured to send logs to a syslog server that can send alerts to the appropriate personnel. Verify that the router is configured to send logs to a syslog server. The configuration should look similar to the example below: logging 10.1.3.22 vrf default severity info If the router is not configured to send log messages to a syslog server, this is a finding.

V-96401

The Cisco router must use cryptographic mechanisms to protect the integrity of audit information at rest.

Finding ID

CISC-ND-000440

Rule ID

SV-105539r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000126-NDM-000242

CCI

CCI-001350

Target Key

(None)

Documentable

Discussion

Audit records may be tampered with. If the integrity of audit data were to become compromised, then forensic analysis and discovery of the true source of potentially malicious system activity is impossible to achieve. Protection of audit records and audit data, including audit configuration settings, is of critical importance. Cryptographic mechanisms are the industry-established standard used to protect the integrity of audit data. An example of a cryptographic mechanism is the computation and application of a cryptographic-signed hash using asymmetric cryptography. This requirement is not intended to cause a new cryptographic hash to be generated every time a record is added to a log file.

Fix Text

Disable archive logging as shown in the example below: RP/0/0/CPU0:R3(config)#no logging archive

Check Content

The Cisco router is not compliant with this requirement. However, the risk associated with this requirement can be fully mitigated if archive logging is not enabled. The following is an example of archive logging. logging archive device disk0 severity notifications file-size 50 frequency daily archive-size 200 If archive logging is configured, this is a finding.

V-96403

The Cisco router must be configured to be configured to prohibit the use of all unnecessary and nonsecure functions and services.

Finding ID

CISC-ND-000470

Rule ID

SV-105541r1_rule

Severity

Cat I

CCE

(None)

Group Title

SRG-APP-000142-NDM-000245

CCI

CCI-000382

Target Key

(None)

Documentable

Discussion

Network devices are capable of providing a wide variety of functions and services. Some of the functions and services provided by default may not be necessary to support essential organizational operations. Additionally, it is sometimes convenient to provide multiple services from a single component (e.g., email and web services); however, doing so increases risk over limiting the services provided by any one component. To support the requirements and principles of least functionality, the network device must support the organizational requirements providing only essential capabilities and limiting the use of ports, protocols, and/or services to only those required, authorized, and approved. Some network devices have capabilities enabled by default; if these capabilities are not necessary, they must be disabled. If a particular capability is used, then it must be documented and approved.

Fix Text

Disable the following services if enabled as shown in the example below. RP/0/0/CPU0:R3(config)#no service ipv4 tcp-small-servers RP/0/0/CPU0:R3(config)#no service ipv4 udp-small-servers RP/0/0/CPU0:R3(config)#no http client vrf xxxxx RP/0/0/CPU0:R3(config)#no telnet ipv4 server

Check Content

Verify that the router does not have any unnecessary or non-secure ports, protocols and services enabled. For example, the following commands should not be in the configuration: service ipv4 tcp-small-servers max-servers 10 service ipv4 udp-small-servers max-servers 10 http client vrf xxxxx telnet vrf default ipv4 server max-servers 1 If any unnecessary or non-secure ports, protocols, or services are enabled, this is a finding.

V-96405

The Cisco router must uniquely identify and authenticate organizational administrators (or processes acting on behalf of organizational administrators).

Finding ID

CISC-ND-000480

Rule ID

SV-105543r1_rule

Severity

Cat I

CCE

(None)

Group Title

SRG-APP-000148-NDM-000246

CCI

CCI-000764

Target Key

(None)

Documentable

Discussion

To assure accountability and prevent unauthenticated access, organizational administrators must be uniquely identified and authenticated for all network management accesses to prevent potential misuse and compromise of the system. This control does not apply to the root account (when applicable) or the account of last resort which are considered to be authorized shared accounts.

Fix Text

Check Content

V-96407

The Cisco router must be configured with only one local account to be used as the account of last resort in the event the authentication server is unavailable.

Finding ID

CISC-ND-000490

Rule ID

SV-105545r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000148-NDM-000346

CCI

CCI-002111

Target Key

(None)

Documentable

Discussion

Authentication for administrative (privileged level) access to the device is required at all times. An account can be created on the device's local database for use when the authentication server is down or connectivity between the device and the authentication server is not operable. This account is referred to as the account of last resort since it is intended to be used as a last resort and when immediate administrative access is absolutely necessary. The account of last resort logon credentials must be stored in a sealed envelope and kept in a safe. The safe must be periodically audited to verify the envelope remains sealed. The signature of the auditor and the date of the audit should be added to the envelope as a record. Administrators should secure the credentials and disable the root account (if possible) when not needed for system administration functions.

Fix Text

Step 1: Configure a local account with the necessary privilege level to troubleshoot network outage and restore operations as shown in the following example: RP/0/0/CPU0:R3(config)#username xxxxxxxxx group netadmin RP/0/0/CPU0:R3(config)#username xxxxxxxxx secret xxxxxx Step 2: Configure the authentication order to use the local account if the authentication server is not reachable as shown in the following example: RP/0/0/CPU0:R3(config)#aaa authentication login default group tacacs+ local

Check Content

Step 1: Review the Cisco router configuration to verify that a local account for last resort has been configured. username xxxxxxxxxxxx group netadmin secret 5 xxxxxxxxxxxxxxxxxxxx Note: The following groups should not be assigned to this local account: root-system and root-lr. A custom group that provides appropriate tasks can be used. Step 2: Verify that local is defined after radius or tacas+ in the authentication order as shown in the example below. aaa authentication login default group tacacs+ local If the Cisco router is not configured with only one local account to be used as the account of last resort in the event the authentication server is unavailable, this is a finding.

V-96409

The Cisco router must use multifactor authentication for network access to privileged accounts.

Finding ID

CISC-ND-000500

Rule ID

SV-105547r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000149-NDM-000247

CCI

CCI-000765

Target Key

(None)

Documentable

Discussion

Multifactor authentication requires using two or more factors to achieve authentication. Factors include: (i) something a user knows (e.g., password/PIN); (ii) something a user has (e.g., cryptographic identification device, token); or (iii) something a user is (e.g., biometric). A privileged account is defined as an information system account with authorizations of a privileged user. Network access is defined as access to an information system by a user (or a process acting on behalf of a user) communicating through a network (e.g., LAN, WAN, or the Internet). This requirement does not apply to the account of last resort or root account. DoD prohibits local user accounts on the device, except for an account of last resort and (where applicable) a root account.

Fix Text

Check Content

V-96411

The Cisco router must use multifactor authentication for local access to privileged accounts.

Finding ID

CISC-ND-000510

Rule ID

SV-105549r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000151-NDM-000248

CCI

CCI-000767

Target Key

(None)

Documentable

Discussion

Multifactor authentication is defined as using two or more factors to achieve authentication. Factors include: (i) Something a user knows (e.g., password/PIN); (ii) Something a user has (e.g., cryptographic identification device, token); or (iii) Something a user is (e.g., biometric). To assure accountability and prevent unauthenticated access, privileged users must utilize multifactor authentication to prevent potential misuse and compromise of the system. Local access is defined as access to an organizational information system by a user (or process acting on behalf of a user) communicating through a direct connection without the use of a network. Applications integrating with the DoD Active Directory and utilizing the DoD CAC are examples of compliant multifactor authentication solutions. This control does not apply to the account of last resort or root account. DoD prohibits local user accounts on the device, except for an account of last resort and (where applicable) a root account.

Fix Text

Check Content

V-96413

The Cisco router must be configured to implement replay-resistant authentication mechanisms for network access to privileged accounts.

Finding ID

CISC-ND-000530

Rule ID

SV-105551r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000156-NDM-000250

CCI

CCI-001941

Target Key

(None)

Documentable

Discussion

A replay attack may enable an unauthorized user to gain access to the application. Authentication sessions between the authenticator and the application validating the user credentials must not be vulnerable to a replay attack. An authentication process resists replay attacks if it is impractical to achieve a successful authentication by recording and replaying a previous authentication message. Techniques used to address this include protocols using nonces (e.g., numbers generated for a specific one-time use) or challenges (e.g., TLS, WS_Security). Additional techniques include time-synchronous or challenge-response one-time authenticators.

Fix Text

Configure the router to use SSH version 2 as shown in the example below. RP/0/0/CPU0:R3(config)#ssh server v2

Check Content

Review the router configuration to verify that SSH version 2 is configured as shown in the example below. ssh server v2 Note: IOS XR supports SSHv1 and SSHv2. SSHv1 uses Rivest, Shamir, and Adelman (RSA) keys while SSHv2 uses Digital Signature Algorithm (DSA) keys. If the router is not configured to implement replay-resistant authentication mechanisms for network access to privileged accounts, this is a finding.

V-96415

The Cisco router must disable identifiers (individuals, groups, roles, and devices) after 35 days of inactivity.

Finding ID

CISC-ND-000540

Rule ID

SV-105553r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000163-NDM-000251

CCI

CCI-000795

Target Key

(None)

Documentable

Discussion

Inactive identifiers pose a risk to network devices. Attackers that are able to exploit an inactive identifier can potentially obtain and maintain undetected access to the device. Owners of inactive accounts may not notice if unauthorized access to their account has been obtained. Network devices need to track periods of inactivity and disable application identifiers after 35 days of inactivity. This control does not apply to the account of last resort or root account. DoD prohibits local user accounts on the device, except for an account of last resort and (where applicable) a root account.

Fix Text

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V-96417

The Cisco router must enforce 24 hours as the minimum password lifetime.

Finding ID

CISC-ND-000640

Rule ID

SV-105555r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000173-NDM-000260

CCI

CCI-000198

Target Key

(None)

Documentable

Discussion

Enforcing a minimum password lifetime helps prevent repeated password changes to defeat the password reuse or history enforcement requirement. Restricting this setting limits the user's ability to change their password. Passwords need to be changed at specific policy-based intervals; however, if the network device allows the user to immediately and continually change their password, then the password could be repeatedly changed in a short period of time to defeat the organization's policy regarding password reuse. This control does not include root account or the account of last resort. For network devices, implementation of this requirement could cause emergency maintenance issues if applied to these local accounts. For example, after maintenance by maintenance personnel who are not normally authorized access to these passwords, the passwords will need to be changed. This is the same as the requirement to change the password when a system administrator with knowledge of the passwords for the root or account of last resort leaves the organization.

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V-96419

The Cisco router must enforce a 60-day maximum password lifetime restriction.

Finding ID

CISC-ND-000650

Rule ID

SV-105557r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000174-NDM-000261

CCI

CCI-000199

Target Key

(None)

Documentable

Discussion

Any password, no matter how complex, can eventually be cracked. Therefore, passwords need to be changed at specific intervals. One method of minimizing this risk is to use complex passwords and periodically change them. If the network device does not limit the lifetime of passwords and force users to change their passwords, there is the risk that the passwords could be compromised. This requirement does not include root account or the account of last resort which are meant for access to the network device in case of failure.

Fix Text

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V-96421

The Cisco router must be configured to terminate all network connections associated with device management after 10 minutes of inactivity.

Finding ID

CISC-ND-000720

Rule ID

SV-105559r1_rule

Severity

Cat I

CCE

(None)

Group Title

SRG-APP-000190-NDM-000267

CCI

CCI-001133

Target Key

(None)

Documentable

Discussion

Terminating an idle session within a short time period reduces the window of opportunity for unauthorized personnel to take control of a management session enabled on the console or console port that has been left unattended. In addition, quickly terminating an idle session will also free up resources committed by the managed network element. Terminating network connections associated with communications sessions includes, for example, de-allocating associated TCP/IP address/port pairs at the operating system level, or de-allocating networking assignments at the application level if multiple application sessions are using a single, operating system-level network connection. This does not mean that the device terminates all sessions or network access; it only ends the inactive session and releases the resources associated with that session.

Fix Text

Set the idle timeout value to "10" minutes or less on all configured login classes as shown in the example below. RP/0/0/CPU0:R3(config)#line con RP/0/0/CPU0:R3(config-line)#exec-timeout RP/0/0/CPU0:R3(config)#line default RP/0/0/CPU0:R3(config-line)#exec-timeout 10 0

Check Content

Review the Cisco router configuration to verify that all network connections associated with a device management have an idle timeout value set to "10" minutes or less as shown in the following example: line console … … … exec-timeout 10 0 ! line default … … … exec-timeout 10 0 transport input ssh If the Cisco router is not configured to terminate all network connections associated with a device management after 10 minutes of inactivity, this is a finding.

V-96423

The Cisco router must activate a system alert message, send an alarm, and/or automatically shut down when a component failure is detected.

Finding ID

CISC-ND-000790

Rule ID

SV-105561r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000268-NDM-000274

CCI

CCI-001328

Target Key

(None)

Documentable

Discussion

Predictable failure prevention requires organizational planning to address device failure issues. If components key to maintaining the device's security fail to function, the device could continue operating in an insecure state. If appropriate actions are not taken when a network device failure occurs, a denial of service condition may occur which could result in mission failure since the network would be operating without a critical security monitoring and prevention function. Upon detecting a failure of network device security components, the network device must activate a system alert message, send an alarm, or shut down.

Fix Text

Configure the router to send SNMP traps to the SNMP manager as shown in the example below. RP/0/0/CPU0:R3(config)#snmp-server host 10.1.3.44 traps version 3 auth xxxxx RP/0/0/CPU0:R3(config)#snmp-server traps The above command will enable all possible traps and is not necessary—selective set of traps can be enabled as required.

Check Content

The Cisco router is not compliant with this requirement. However, the risk associated with this requirement can be fully mitigated if the router is configured to send SNMP traps and notifications to the SNMP manager for the purpose of sending alarms and notifying appropriate personnel as required by specific events. The SNMP configuration should contain commands similar to the example below. snmp-server host 10.1.3.44 traps private snmp-server traps rf snmp-server traps bfd snmp-server traps ethernet cfm snmp-server traps ntp snmp-server traps ethernet oam events snmp-server traps copy-complete snmp-server traps snmp linkup snmp-server traps snmp linkdown snmp-server traps snmp coldstart snmp-server traps snmp warmstart snmp-server traps snmp authentication … … … snmp-server traps entity-state operstatus snmp-server traps entity-state switchover snmp-server traps entity-redundancy all snmp-server traps entity-redundancy status snmp-server traps entity-redundancy switchover Note: The above is a subset of all the possible traps that can be enabled. Selective traps can be enabled as required. If the router is not configured to send traps to the SNMP manager, this is a finding.

V-96425

The Cisco router must generate alerts that can be forwarded to the administrators and ISSO when accounts are created.

Finding ID

CISC-ND-000800

Rule ID

SV-105563r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000291-NDM-000275

CCI

CCI-001683

Target Key

(None)

Documentable

Discussion

Once an attacker establishes initial access to a system, the attacker often attempts to create a persistent method of reestablishing access. One way to accomplish this is for the attacker to simply create a new account. Notification of account creation is one method for mitigating this risk. A comprehensive account management process will ensure an audit trail which documents the creation of accounts and notifies administrators and Information System Security Officers (ISSO). Such a process greatly reduces the risk that accounts will be surreptitiously created and provides logging that can be used for forensic purposes.

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V-96427

The Cisco router must generate alerts that can be forwarded to the administrators and ISSO when accounts are modified.

Finding ID

CISC-ND-000810

Rule ID

SV-105565r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000292-NDM-000276

CCI

CCI-001684

Target Key

(None)

Documentable

Discussion

Once an attacker establishes initial access to a system, the attacker often attempts to create a persistent method of reestablishing access. One way to accomplish this is for the attacker to simply modify an existing account. Notification of account modification is one method for mitigating this risk. A comprehensive account management process will ensure an audit trail which documents the modification of device administrator accounts and notifies administrators and ISSO. Such a process greatly reduces the risk that accounts will be surreptitiously modified and provides logging that can be used for forensic purposes. The network device must generate the alert. Notification may be done by a management server. This control applies to locally defined accounts, including the root account and the account of last resort.

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V-96429

The Cisco router must generate alerts that can be forwarded to the administrators and ISSO when accounts are disabled.

Finding ID

CISC-ND-000820

Rule ID

SV-105567r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000293-NDM-000277

CCI

CCI-001685

Target Key

(None)

Documentable

Discussion

When application accounts are disabled, administrator accessibility is affected. Accounts are utilized for identifying individual device administrators or for identifying the device processes themselves. In order to detect and respond to events that affect administrator accessibility and device processing, devices must audit account disabling actions and, as required, notify the appropriate individuals so they can investigate the event. Such a capability greatly reduces the risk that device accessibility will be negatively affected for extended periods of time and also provides logging that can be used for forensic purposes.

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V-96431

The Cisco router must generate alerts that can be forwarded to the administrators and ISSO when accounts are removed.

Finding ID

CISC-ND-000830

Rule ID

SV-105569r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000294-NDM-000278

CCI

CCI-001686

Target Key

(None)

Documentable

Discussion

When application accounts are removed, administrator accessibility is affected. Accounts are utilized for identifying individual device administrators or for identifying the device processes themselves. In order to detect and respond to events that affect administrator accessibility and device processing, devices must audit account removal actions and, as required, notify the appropriate individuals so they can investigate the event. Such a capability greatly reduces the risk that device accessibility will be negatively affected for extended periods of time and also provides logging that can be used for forensic purposes.

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V-96435

The Cisco router must notify System Administrators (SAs) and Information System Security Officers (ISSMs) when accounts are created, or enabled when previously disabled.

Finding ID

CISC-ND-000890

Rule ID

SV-105573r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000320-NDM-000284

CCI

CCI-002132

Target Key

(None)

Documentable

Discussion

Once an attacker establishes initial access to a system, the attacker often attempts to create a persistent method of reestablishing access. One way to accomplish this is for the attacker to simply enable a new or disabled account. Notification of account enabling is one method for mitigating this risk. A comprehensive account management process will ensure an audit trail which documents the creation of application user accounts and notifies SAs and ISSMs. Such a process greatly reduces the risk that accounts will be surreptitiously enabled and provides logging that can be used for forensic purposes. In order to detect and respond to events that affect network administrator accessibility and device processing, network devices must audit account enabling actions and, as required, notify the appropriate individuals so they can investigate the event.

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V-96437

The Cisco router must be configured to be compliant with at least one IETF Internet standard authentication protocol.

Finding ID

CISC-ND-000900

Rule ID

SV-105575r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000325-NDM-000285

CCI

CCI-002353

Target Key

(None)

Documentable

Discussion

Protecting access authorization information (i.e., access control decisions) ensures that authorization information cannot be altered, spoofed, or otherwise compromised during transmission. In distributed information systems, authorization processes and access control decisions may occur in separate parts of the systems. In such instances, authorization information is transmitted securely so timely access control decisions can be enforced at the appropriate locations. To support the access control decisions, it may be necessary to transmit, as part of the access authorization information, supporting security attributes. This is because, in distributed information systems, there are various access control decisions that need to be made, and different entities (e.g., services) make these decisions in a serial fashion, each requiring some security attributes to make the decisions. The network device must be compliant with at least one IETF standard authentication protocol such as Remote Authentication Dial-In User Service (RADIUS), Extensible Authentication Protocol (EAP), Lightweight Directory Access Protocol (LDAP), and Terminal Access Controller Access-Control System Plus (TACACS+). Protocols that are clearly defined in IETF RFC Internet standards (a.k.a. full standards), and are capable of securely conveying authorization information, are suitable for use.

Fix Text

Step 1: Configure the router to use an authentication server as shown in the following example: RP/0/0/CPU0:R3(config)#radius-server host x.x.x.x key xxxxxxxx Step 2: Configure the authentication order to use the authentication server as primary source for authentication as shown in the following example: RP/0/0/CPU0:R3(config)#aaa authentication login LOGIN_AUTHENTICATION group radius local Step 3: Configure all network connections associated with a device management to use an authentication server for the purpose of login authentication as shown in the following example: RP/0/0/CPU0:R3(config)#line default RP/0/0/CPU0:R3(config-line)#login authentication LOGIN_AUTHENTICATION RP/0/0/CPU0:R3(config-line)#exit RP/0/0/CPU0:R3(config)#line console RP/0/0/CPU0:R3(config-line)#login authentication LOGIN_AUTHENTICATION

Check Content

Review the Cisco router configuration to verify that the device is configured to use an authentication server as primary source for authentication as shown in the following example: radius-server host x.x.x.x auth-port 1645 acct-port 1646 key 7 070D2E4E4C10 … … … aaa authentication login LOGIN_AUTHENTICATION group radius local line console login authentication LOGIN_AUTHENTICATION ! line default login authentication LOGIN_AUTHENTICATION transport input ssh If the Cisco router is not configured to use an authentication server as primary source for authentication, this is a finding.

V-96439

The Cisco router must automatically lock the account until the locked account is released by an administrator when three unsuccessful login attempts in 15 minutes are exceeded.

Finding ID

CISC-ND-000950

Rule ID

SV-105577r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000345-NDM-000290

CCI

CCI-002238

Target Key

(None)

Documentable

Discussion

By limiting the number of failed login attempts, the risk of unauthorized system access via user password guessing, otherwise known as brute-forcing, is reduced. Limits are imposed by locking the account.

Fix Text

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V-96441

The Cisco router must notify the administrator, upon successful logon (access), of the location of last logon (terminal or IP address) in addition to the date and time of the last logon (access).

Finding ID

CISC-ND-000960

Rule ID

SV-105579r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000346-NDM-000291

CCI

CCI-002250

Target Key

(None)

Documentable

Discussion

Administrators need to be aware of activity that occurs regarding their account. Providing them with information deemed important by the organization may aid in the discovery of unauthorized access or thwart a potential attacker. Organizations should consider the risks to the specific information system being accessed and the threats presented by the device to the environment when configuring this option. An excessive or unnecessary amount of information presented to the administrator at logon is not recommended.

Fix Text

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V-96443

The Cisco router must be configured to allocate audit record storage capacity in accordance with organization-defined audit record storage requirements.

Finding ID

CISC-ND-000980

Rule ID

SV-105581r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000357-NDM-000293

CCI

CCI-001849

Target Key

(None)

Documentable

Discussion

In order to ensure network devices have a sufficient storage capacity in which to write the audit logs, they need to be able to allocate audit record storage capacity. The task of allocating audit record storage capacity is usually performed during initial device setup if it is modifiable. The value for the organization-defined audit record storage requirement will depend on the amount of storage available on the network device, the anticipated volume of logs, the frequency of transfer from the network device to centralized log servers, and other factors.

Fix Text

Configure the logging buffer size as well as the active log file size and the amount of storage to be reserved for archive log files as shown in the example below. RP/0/0/CPU0:R3(config)#logging buffered 8888888 RP/0/0/CPU0:R3(config)#logging archive RP/0/0/CPU0:R3(config-logging-arch)#severity notifications RP/0/0/CPU0:R3(config-logging-arch)#device harddisk RP/0/0/CPU0:R3(config-logging-arch)#archive-size 100 RP/0/0/CPU0:R3(config-logging-arch)#file-size 10 RP/0/0/CPU0:R3(config-logging-arch)#end

Check Content

Verify that the Cisco router is configured with a logging buffer size as well as on the hard drive. The configuration should look like the example below: logging archive device harddisk severity notifications file-size 10 archive-size 100 … … … logging buffered 8888888 If a logging buffer size and the archive size is not configured, this is a finding. If the Cisco router is not configured to allocate audit record storage capacity in accordance with organization-defined audit record storage requirements, this is a finding.

V-96445

The Cisco router must generate an immediate alert when allocated audit record storage volume reaches 75% of repository maximum audit record storage capacity.

Finding ID

CISC-ND-000990

Rule ID

SV-105583r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000359-NDM-000294

CCI

CCI-001855

Target Key

(None)

Documentable

Discussion

If security personnel are not notified immediately upon storage volume utilization reaching 75%, they are unable to plan for storage capacity expansion. This could lead to the loss of audit information. Note that while the network device must generate the alert, notification may be done by a management server.

Fix Text

Configure the router to send log messages to the syslog server as shown in the example below. RP/0/0/CPU0:R3(config)#logging 10.1.3.22 severity info

Check Content

V-96447

The Cisco router must be configured to generate an alert for all audit failure events.

Finding ID

CISC-ND-001000

Rule ID

SV-105585r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000360-NDM-000295

CCI

CCI-001858

Target Key

(None)

Documentable

Discussion

It is critical for the appropriate personnel to be aware if a system is at risk of failing to process audit logs as required. Without a real-time alert, security personnel may be unaware of an impending failure of the audit capability and system operation may be adversely affected. Alerts provide organizations with urgent messages. Real-time alerts provide these messages immediately (i.e., the time from event detection to alert occurs in seconds or less).

Fix Text

Configure the Cisco router to send critical to emergency log messages to the syslog server as shown in the example below. RP/0/0/CPU0:R3(config)#logging 10.1.12.7 severity critical Note: The parameter "critical" can replaced with a lesser severity level (i.e., error, warning, notice, informational).

Check Content

Review the Cisco router configuration to verify that it is compliant with this requirement as shown in the example below. logging 10.1.12.7 vrf default severity critical Note: The parameter "critical" can be replaced with a lesser severity level (i.e., error, warning, notice, informational). If the Cisco router is not configured to generate an alert for all audit failure events, this is a finding.

V-96449

The Cisco router must be configured to synchronize its clock with the primary and secondary time sources using redundant authoritative time sources.

Finding ID

CISC-ND-001030

Rule ID

SV-105587r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000373-NDM-000298

CCI

CCI-001893

Target Key

(None)

Documentable

Discussion

The loss of connectivity to a particular authoritative time source will result in the loss of time synchronization (free-run mode) and increasingly inaccurate time stamps on audit events and other functions. Multiple time sources provide redundancy by including a secondary source. Time synchronization is usually a hierarchy; clients synchronize time to a local source while that source synchronizes its time to a more accurate source. The network device must utilize an authoritative time server and/or be configured to use redundant authoritative time sources. This requirement is related to the comparison done in CCI-001891. DoD-approved solutions consist of a combination of a primary and secondary time source using a combination or multiple instances of the following: a time server designated for the appropriate DoD network (NIPRNet/SIPRNet); United States Naval Observatory (USNO) time servers; and/or the Global Positioning System (GPS). The secondary time source must be located in a different geographic region than the primary time source.

Fix Text

Configure the Cisco router to synchronize its clock with redundant authoritative time sources as shown in the example below. RP/0/0/CPU0:R3 (config)#ntp server x.x.x.x RP/0/0/CPU0:R3 (config)#ntp server y.y.y.y

Check Content

Review the Cisco router configuration to verify that it is compliant with this requirement as shown in the configuration example below. ntp server x.x.x.x ntp server y.y.y.y If the Cisco router is not configured to synchronize its clock with redundant authoritative time sources, this is a finding.

V-96451

The Cisco router must record time stamps for audit records that meet a granularity of one second for a minimum degree of precision.

Finding ID

CISC-ND-001040

Rule ID

SV-105589r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000375-NDM-000300

CCI

CCI-001889

Target Key

(None)

Documentable

Discussion

Without sufficient granularity of time stamps, it is not possible to adequately determine the chronological order of records. Time stamps generated by the application include date and time. Granularity of time measurements refers to the degree of synchronization between information system clocks and reference clocks.

Fix Text

Configure the Cisco router to record time stamps that meet a granularity of one second as shown in the example below. RP/0/0/CPU0:R3(config)#service timestamps log datetime localtime

Check Content

Review the Cisco router configuration to verify that it is compliant with this requirement as shown in the example below. hostname R3 service timestamps log datetime localtime If the router is not configured to record time stamps that meet a granularity of one second, this is a finding.

V-96453

The Cisco router must be configured to record time stamps for log records that can be mapped to Coordinated Universal Time (UTC) or Greenwich Mean Time (GMT).

Finding ID

CISC-ND-001050

Rule ID

SV-105591r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000374-NDM-000299

CCI

CCI-001890

Target Key

(None)

Documentable

Discussion

If time stamps are not consistently applied and there is no common time reference, it is difficult to perform forensic analysis. Time stamps generated by the application include date and time. Time is commonly expressed in UTC, a modern continuation of GMT, or local time with an offset from UTC.

Fix Text

Configure the Cisco router to record time stamps for audit records that can be mapped to UTC or GMT as shown in the example below. RP/0/0/CPU0:R3(config)#clock timezone EST -5 RP/0/0/CPU0:R3(config)#service timestamps log datetime localtime

Check Content

Review the Cisco router configuration to verify that it is compliant with this requirement as shown in the example below. hostname R3 clock timezone EST -5 service timestamps log datetime localtime Note: UTC is the default; hence, the command set time-zone may not be seen in the configuration. This can be verified using the show system uptime command. If the router is not configured to record time stamps for audit records that can be mapped to UTC or GMT, this is a finding.

V-96455

The Cisco router must generate an alert that will then be sent to the ISSO, ISSM, and other designated personnel (deemed appropriate by the local organization) when the unauthorized installation of software is detected.

Finding ID

CISC-ND-001060

Rule ID

SV-105593r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000377-NDM-000301

CCI

CCI-001811

Target Key

(None)

Documentable

Discussion

Unauthorized software not only increases risk by increasing the number of potential vulnerabilities, it also can contain malicious code. Sending an alert (in real time) when unauthorized software is detected allows designated personnel to take action on the installation of unauthorized software. Note that while the device must generate the alert, the notification may be done by a management server.

Fix Text

Configure the router to send log messages to the syslog server as shown in the example below. RP/0/0/CPU0:R3(config)#logging 10.1.3.22 severity info

Check Content

V-96457

The Cisco router must require users to re-authenticate when privilege escalation or role changes occur.

Finding ID

CISC-ND-001100

Rule ID

SV-105595r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000389-NDM-000306

CCI

CCI-002038

Target Key

(None)

Documentable

Discussion

Without re-authentication, users may access resources or perform tasks for which they do not have authorization. When devices provide the capability to change security roles, it is critical the user re-authenticate. In addition to the re-authentication requirements associated with session locks, organizations may require re-authentication of individuals and/or devices in other situations, including (but not limited to) the following circumstances. (i) When authenticators change; (ii) When roles change; (iii) When security categories of information systems change; (iv) When the execution of privileged functions occurs; (v) After a fixed period of time; or (vi) Periodically. Within the DoD, the minimum circumstances requiring re-authentication are privilege escalation and role changes.

Fix Text

Check Content

V-96459

The Cisco router must accept Personal Identity Verification (PIV) credentials.

Finding ID

CISC-ND-001110

Rule ID

SV-105597r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000391-NDM-000308

CCI

CCI-001953

Target Key

(None)

Documentable

Discussion

The use of PIV credentials facilitates standardization and reduces the risk of unauthorized access. DoD has mandated the use of the CAC to support identity management and personal authentication for systems covered under HSPD 12, as well as a primary component of layered protection for national security systems.

Fix Text

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V-96461

The Cisco router must electronically verify Personal Identity Verification (PIV) credentials.

Finding ID

CISC-ND-001120

Rule ID

SV-105599r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000392-NDM-000309

CCI

CCI-001954

Target Key

(None)

Documentable

Discussion

Fix Text

Check Content

V-96463

The Cisco router must be configured to authenticate SNMP messages using a FIPS-validated Keyed-Hash Message Authentication Code (HMAC).

Finding ID

CISC-ND-001130

Rule ID

SV-105601r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000395-NDM-000310

CCI

CCI-001967

Target Key

(None)

Documentable

Discussion

Without authenticating devices, unidentified or unknown devices may be introduced, thereby facilitating malicious activity. Bidirectional authentication provides stronger safeguards to validate the identity of other devices for connections that are of greater risk. A local connection is any connection with a device communicating without the use of a network. A network connection is any connection with a device that communicates through a network (e.g., local area or wide area network, Internet). A remote connection is any connection with a device communicating through an external network (e.g., the Internet). Because of the challenges of applying this requirement on a large scale, organizations are encouraged to only apply the requirement to those limited number (and type) of devices that truly need to support this capability.

Fix Text

Configure the Cisco router to authenticate SNMP messages as shown in the example below. RP/0/0/CPU0:R3(config)#snmp-server group V3GROUP v3 auth read V3READ write V3WRITE RP/0/0/CPU0:R3(config)#snmp-server user V3USER V3GROUP v3 auth sha xxxxxx RP/0/0/CPU0:R3(config)#snmp-server view V3READ iso included RP/0/0/CPU0:R3(config)#snmp-server view V3WRITE iso included RP/0/0/CPU0:R3(config)#snmp-server host x.x.x.x version 3 auth V3USER

Check Content

Review the Cisco router configuration to verify that it is compliant with this requirement as shown in the example below. snmp-server host x.x.x.x traps version 3 auth V3USER snmp-server user V3USER V3GROUP v3 auth sha snmp-server view V3READ iso included snmp-server view V3WRITE iso included snmp-server group V3GROUP v3 auth read V3READ write V3WRITE If the Cisco router is not configured to authenticate SNMP messages using a FIPS-validated HMAC, this is a finding.

V-96465

The Cisco router must be configured to encrypt SNMP messages using a FIPS 140-2 approved algorithm.

Finding ID

CISC-ND-001140

Rule ID

SV-105603r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000395-NDM-000310

CCI

CCI-000068

Target Key

(None)

Documentable

Discussion

Without the strong encryption that is provided by the SNMP Version 3 User-based Security Model (USM), an unauthorized user can gain access to network management information that can be used to create a network outage.

Fix Text

Configure the Cisco router to encrypt SNMP messages using a FIPS 140-2 approved algorithm as shown in the example below. RP/0/0/CPU0:R3(config)#snmp-server group V3GROUP v3 auth read V3READ write V3WRITE RP/0/0/CPU0:R3(config)#snmp-server user V3USER V3GROUP v3 auth sha xxxxxx priv aes 256 xxxxxx RP/0/0/CPU0:R3(config)#snmp-server view V3READ iso included RP/0/0/CPU0:R3(config)#snmp-server view V3WRITE iso included RP/0/0/CPU0:R3(config)#snmp-server host x.x.x.x version 3 auth V3USER

Check Content

Review the Cisco router configuration to verify that it is compliant with this requirement as shown in the example below. snmp-server host x.x.x.x traps version 3 auth V3USER snmp-server user V3USER V3GROUP v3 auth sha encrypted 110B1607150B snmp-server view V3READ iso included snmp-server view V3WRITE iso included snmp-server group V3GROUP v3 auth read V3READ write V3WRITE If the Cisco router is not configured to encrypt SNMP messages using a FIPS 140-2 approved algorithm, this is a finding.

V-96467

The Cisco router must be configured to authenticate NTP sources using authentication that is cryptographically based.

Finding ID

CISC-ND-001150

Rule ID

SV-105605r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000395-NDM-000347

CCI

CCI-001967

Target Key

(None)

Documentable

Discussion

If Network Time Protocol is not authenticated, an attacker can introduce a rogue NTP server. This rogue server can then be used to send incorrect time information to network devices, which will make log timestamps inaccurate and affect scheduled actions. NTP authentication is used to prevent this tampering by authenticating the time source.

Fix Text

Configure the Cisco router to authenticate NTP sources using authentication that is cryptographically based as shown in the example below. RP/0/0/CPU0:R4#ntp authenticate RP/0/0/CPU0:R4#ntp authentication-key 1 md5 xxxxxx RP/0/0/CPU0:R4#ntp trusted-key RP/0/0/CPU0:R4#ntp server x.x.x.x key 1 RP/0/0/CPU0:R4#ntp server y.y.y.y key 1

Check Content

Review the Cisco router configuration to verify that it is compliant with this requirement as shown in the configuration example below. ntp authentication-key 1 md5 encrypted 030654090416 trusted-key 1 server x.x.x.x key 1 server y.y.y.y key 1 If the Cisco router is not configured to authenticate NTP sources using authentication that is cryptographically based, this is a finding.

V-96469

The Cisco router must dynamically manage identifiers.

Finding ID

CISC-ND-001160

Rule ID

SV-105607r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000396-NDM-000311

CCI

CCI-001976

Target Key

(None)

Documentable

Discussion

Dynamic identifier management prevents disruption of operations by minimizing the need for system restarts. Dynamic establishment of new identifiers will occur while the system is operational. New identifiers or changes to existing identifiers must take effect without the need for a system or session restart. Pre-established trust relationships and mechanisms with appropriate authorities (e.g., Active Directory or authentication server) which validate each identifier are essential to prevent unauthorized access by changed or revoked accounts.

Fix Text

Check Content

V-96471

The Cisco router must allow the use of a temporary password for system logons with an immediate change to a permanent password.

Finding ID

CISC-ND-001170

Rule ID

SV-105609r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000397-NDM-000312

CCI

CCI-002041

Target Key

(None)

Documentable

Discussion

Without providing this capability, an account may be created without a password. Non-repudiation cannot be guaranteed once an account is created if a user is not forced to change the temporary password upon initial login. Temporary passwords are typically used to allow access to applications when new accounts are created or passwords are changed. It is common practice for administrators to create temporary passwords for user accounts that allow the users to log in yet force them to change the password once they have successfully authenticated.

Fix Text

Check Content

V-96473

The Cisco router must be configured to use FIPS-validated Keyed-Hash Message Authentication Code (HMAC) to protect the integrity of remote maintenance sessions.

Finding ID

CISC-ND-001200

Rule ID

SV-105611r1_rule

Severity

Cat I

CCE

(None)

Group Title

SRG-APP-000411-NDM-000330

CCI

CCI-002890

Target Key

(None)

Documentable

Discussion

Unapproved mechanisms that are used for authentication to the cryptographic module are not verified and therefore cannot be relied upon to provide confidentiality or integrity, and DoD data may be compromised. Nonlocal maintenance and diagnostic activities are those activities conducted by individuals communicating through a network, either an external network (e.g., the Internet) or an internal network. Currently, HMAC is the only FIPS-approved algorithm for generating and verifying message/data authentication codes in accordance with FIPS 198-1. Products that are FIPS 140-2 validated will have an HMAC that meets specification; however, the option must be configured for use as the only message authentication code use d for authentication to cryptographic modules.

Fix Text

Configure the router to use SSH version 2 as shown in the example below. RP/0/0/CPU0:R3(config)#ssh server v2

Check Content

Review the router configuration to verify that SSH version 2 is configured as shown in the example below. ssh server v2 Note: IOS XR supports SSHv1 and SSHv2. SSHv1 uses Rivest, Shamir, and Adelman (RSA) keys while SSHv2 uses Digital Signature Algorithm (DSA) keys which is FIPS 186-4. If the Cisco router is not configured to use FIPS-validated HMAC to protect the integrity of remote maintenance sessions, this is a finding.

V-96475

The Cisco router must be configured to implement cryptographic mechanisms to protect the confidentiality of remote maintenance sessions.

Finding ID

CISC-ND-001210

Rule ID

SV-105613r1_rule

Severity

Cat I

CCE

(None)

Group Title

SRG-APP-000412-NDM-000331

CCI

CCI-003123

Target Key

(None)

Documentable

Discussion

This requires the use of secure protocols instead of their unsecured counterparts, such as SSH instead of telnet, SCP instead of FTP, and HTTPS instead of HTTP. If unsecured protocols (lacking cryptographic mechanisms) are used for sessions, the contents of those sessions will be susceptible to eavesdropping, potentially putting sensitive data (including administrator passwords) at risk of compromise and potentially allowing hijacking of maintenance sessions.

Fix Text

Configure the router to use SSH version 2 as shown in the example below. RP/0/0/CPU0:R3(config)#ssh server v2

Check Content

Review the router configuration to verify that SSH version 2 is configured as shown in the example below. ssh server v2 Note: IOS XR supports SSHv1 and SSHv2. The AES encryption algorithm is supported on the SSHv2 server and client, but not on the SSHv1 server and client. Any requests for an AES cipher sent by an SSHv2 client to an SSHv1 server are ignored, with the server using 3DES instead. The cipher preference for the SSH server follows the order AES128, AES192, AES256, and, finally, 3DES. The server rejects any requests by the client for an unsupported cipher, and the SSH session does not proceed. If the router is configured to implement SSH version 1, this is a finding.

V-96477

The Cisco router must be configured to off-load log records onto a different system than the system being audited.

Finding ID

CISC-ND-001310

Rule ID

SV-105615r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000515-NDM-000325

CCI

CCI-001851

Target Key

(None)

Documentable

Discussion

Information stored in one location is vulnerable to accidental or incidental deletion or alteration. Off-loading is a common process in information systems with limited audit storage capacity.

Fix Text

Configure the Cisco router to send log records to a syslog server as shown in the example below. RP/0/0/CPU0:R3(config)#logging 10.1.12.7 severity info

Check Content

Review the Cisco router configuration to verify that it is compliant with this requirement as shown in the example below. logging 10.1.12.7 vrf default severity info If the Cisco router is not configured to off-load log records onto a different system than the system being audited, this is a finding.

V-96479

The Cisco router must notify the administrator of the number of successful logon attempts occurring during an organization-defined time period.

Finding ID

CISC-ND-001330

Rule ID

SV-105617r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000516-NDM-000332

CCI

CCI-001391

Target Key

(None)

Documentable

Discussion

Administrators need to be aware of activity that occurs regarding their network device management account. Providing administrators with information regarding the date and time of their last successful login allows the administrator to determine if any unauthorized activity has occurred. This incorporates all methods of login including, but not limited to, SSH, HTTP, HTTPS, and physical connectivity. The organization-defined time period is dependent on the frequency with which administrators typically log in to the network device.

Fix Text

Check Content

V-96481

The Cisco router must use automated mechanisms to alert security personnel to threats identified by authoritative sources (e.g., CTOs) and in accordance with CJCSM 6510.01B.

Finding ID

CISC-ND-001340

Rule ID

SV-105619r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000516-NDM-000333

CCI

CCI-001274

Target Key

(None)

Documentable

Discussion

By immediately displaying an alarm message, potential security violations can be identified more quickly even when administrators are not logged into the network device.

Fix Text

Configure the router to send log messages to the syslog server as shown in the example below. RP/0/0/CPU0:R3(config)#logging 10.1.3.22 severity info

Check Content

V-96483

The Cisco router must be configured to use an authentication server for the purpose of authenticating users prior to granting administrative access.

Finding ID

CISC-ND-001370

Rule ID

SV-105621r1_rule

Severity

Cat I

CCE

(None)

Group Title

SRG-APP-000516-NDM-000336

CCI

CCI-000370

Target Key

(None)

Documentable

Discussion

Centralized management of user accounts and authentication increases the administrative access to the router. This control is particularly important protection against the insider threat. With robust centralized management, audit records for administrator account access to the organization's network devices can be more readily analyzed for trends and anomalies. The alternative method of defining administrator accounts on each device exposes the device configuration to remote access authentication attacks and system administrators with multiple authenticators for each network device.

Fix Text

Check Content

Review the Cisco router configuration to verify that the device is configured to use an authentication server as primary source for authentication as shown in the following example: radius-server host 10.1.3.16 auth-port 1645 acct-port 1646 key xxxxxxxxxx … … … aaa authentication login LOGIN_AUTHENTICATION group radius local line console login authentication LOGIN_AUTHENTICATION ! line default login authentication LOGIN_AUTHENTICATION transport input ssh If the Cisco router is not configured to use an authentication server for the purpose of authenticating users prior to granting administrative access, this is a finding.

V-96485

The Cisco router must employ automated mechanisms to centrally apply authentication settings.

Finding ID

CISC-ND-001380

Rule ID

SV-105623r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000516-NDM-000337

CCI

CCI-000371

Target Key

(None)

Documentable

Discussion

The use of authentication servers or other centralized management servers for providing centralized authentication services is required for network device management. Maintaining local administrator accounts for daily usage on each network device without centralized management is not scalable or feasible. Without centralized management, it is likely that credentials for some network devices will be forgotten, leading to delays in administration, which itself leads to delays in remediating production problems and in addressing compromises in a timely fashion.

Fix Text

Check Content

V-96487

The Cisco router must employ automated mechanisms to centrally verify authentication settings.

Finding ID

CISC-ND-001390

Rule ID

SV-105625r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000516-NDM-000338

CCI

CCI-000372

Target Key

(None)

Documentable

Discussion

Fix Text

Check Content

V-96489

The Cisco router must employ automated mechanisms to detect the addition of unauthorized components or devices.

Finding ID

CISC-ND-001400

Rule ID

SV-105627r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000516-NDM-000339

CCI

CCI-000416

Target Key

(None)

Documentable

Discussion

This requirement addresses configuration management of the network device. The network device must automatically detect the installation of unauthorized software or hardware onto the device itself. Monitoring may be accomplished on an ongoing basis or by periodic monitoring. Automated mechanisms can be implemented within the network device and/or in another separate information system or device. If the addition of unauthorized components or devices is not automatically detected, then such components or devices could be used for malicious purposes, such as transferring sensitive data to removable media for compromise.

Fix Text

Check Content

V-96491

The Cisco router must be configured to back up the configuration when changes occur.

Finding ID

CISC-ND-001410

Rule ID

SV-105629r2_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000516-NDM-000340

CCI

CCI-000537

Target Key

(None)

Documentable

Discussion

System-level information includes default and customized settings and security attributes, including ACLs that relate to the network device configuration, as well as software required for the execution and operation of the device. Information system backup is a critical step in ensuring system integrity and availability. If the system fails and there is no backup of the system-level information, a denial of service condition is possible for all who utilize this critical network component. This control requires the network device to support the organizational central backup process for system-level information associated with the network device. This function may be provided by the network device itself; however, the preferred best practice is a centralized backup rather than each network device performing discrete backups.

Fix Text

Configure the Cisco router to send the configuration to an TFTP or FTP server when a configuration change occurs as shown in the example below. RP/0/0/CPU0:R3(config)#configuration commit auto-save filename tftp:// 10.1.3.18

Check Content

Review the Cisco router configuration to verify that it is compliant with this requirement. The example configuration below will send the configuration to an TFTP server when a configuration change occurs. configuration commit auto-save filename tftp://10.1.3.18 If the Cisco router is not configured to conduct backups of the configuration when changes occur, this is a finding.

V-96493

The Cisco router must employ automated mechanisms to assist in the tracking of security incidents.

Finding ID

CISC-ND-001430

Rule ID

SV-105631r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000516-NDM-000342

CCI

CCI-000833

Target Key

(None)

Documentable

Discussion

Despite the investment in perimeter defense technologies, enclaves are still faced with detecting, analyzing, and remediating network breaches and exploits that have made it past the network device. An automated incident response infrastructure allows network operations to immediately react to incidents by identifying, analyzing, and mitigating any network device compromise. Incident response teams can perform root cause analysis, determine how the exploit proliferated, and identify all affected nodes, as well as contain and eliminate the threat. The network device assists in the tracking of security incidents by logging detected security events. The audit log and network device application logs capture different types of events. The audit log tracks audit events occurring on the components of the network device. The application log tracks the results of the network device content filtering function. These logs must be aggregated into a centralized server and can be used as part of the organization's security incident tracking and analysis.

Fix Text

Configure the router to send log messages to the syslog server as shown in the example below. RP/0/0/CPU0:R3(config)#logging 10.1.3.22 severity info

Check Content

The Cisco router is not compliant with this requirement. However, the risk associated with this requirement can be fully mitigated if the router is configured to send logs to a syslog server that can be used to assist in the tracking of security incidents. Verify that the router is configured to send logs to a syslog server. The configuration should look similar to the example below: logging 10.1.3.22 vrf default severity info If the router is not configured to send log messages to a syslog server, this is a finding.

V-96495

The Cisco router must be configured to obtain its public key certificates from an appropriate certificate policy through an approved service provider.

Finding ID

CISC-ND-001440

Rule ID

SV-105633r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000516-NDM-000344

CCI

CCI-001159

Target Key

(None)

Documentable

Discussion

For user certificates, each organization obtains certificates from an approved, shared service provider, as required by OMB policy. For federal agencies operating a legacy public key infrastructure cross-certified with the Federal Bridge Certification Authority (CA) at medium assurance or higher, this Certification Authority will suffice.

Fix Text

Configure the router to obtain its public key certificates from an appropriate certificate policy through an approved service provider as show in the example below. RP/0/0/CPU0:R3(config)#crypto ca trustpoint CA_X RP/0/0/CPU0:R3(config-trustp)#enrollment url http://trustpoint1.example.com

Check Content

Review the router configuration to determine if a CA trust point has been configured. The CA trust point will contain the URL of the CA in which the router has enrolled with. Verify this is a DoD or DoD-approved CA. This will ensure the router has enrolled and received a certificate from a trusted CA. The CA trust point configuration would look similar to the example below. crypto pki trustpoint CA_X enrollment url http://trustpoint1.example.com Note: A remote end-point's certificate will always be validated by the router by verifying the signature of the CA on the certificate using the CA's public key, which is contained in the router's certificate it received at enrollment. Note: This requirement is not applicable if the router does not have any public key certificates. If the Cisco router is not configured to obtain its public key certificates from an appropriate certificate policy through an approved service provider, this is a finding.

V-96497

The Cisco router must be configured to send log data to a syslog server for the purpose of forwarding alerts to the administrators and the ISSO.

Finding ID

CISC-ND-001450

Rule ID

SV-105635r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000516-NDM-000317

CCI

CCI-000366

Target Key

(None)

Documentable

Discussion

The aggregation of log data kept on a syslog server can be used to detect attacks and trigger an alert to the appropriate security personnel. The stored log data can used to detect weaknesses in security that enable the network IA team to find and address these weaknesses before breaches can occur. Reviewing these logs, whether before or after a security breach, are important in showing whether someone is an internal employee or an outside threat.

Fix Text

Configure the router to send log messages to the syslog server as shown in the example below. RP/0/0/CPU0:R3(config)#logging 10.1.3.22 severity info

Check Content

Verify that the router is configured to send logs to a syslog server. The configuration should look similar to the example below: logging 10.1.3.22 vrf default severity info If the router is not configured to send log data to the syslog server, this is a finding.

V-96499

The Cisco router must be configured to send SNMP traps and notifications to the SNMP manager for the purpose of sending alarms and notifying appropriate personnel as required by specific events.

Finding ID

CISC-ND-001460

Rule ID

SV-105637r1_rule

Severity

Cat II

CCE

(None)

Group Title

SRG-APP-000516-NDM-000317

CCI

CCI-000366

Target Key

(None)

Documentable

Discussion

If appropriate actions are not taken when a network device failure occurs, a denial of service condition may occur which could result in mission failure since the network would be operating without a critical security monitoring and prevention function. Upon detecting a failure of any router components, the router must activate a system alert message, send an alarm, or shut down. By immediately displaying an alarm message, potential security violations can be identified more quickly even when administrators are not logged into the device. This can be facilitated by the router sending SNMP traps to the SNMP manager that can then have the necessary action taken by automatic or operator intervention.

Fix Text

Configure the router to send SNMP traps to the SNMP manager. RP/0/0/CPU0:R3(config)#snmp-server host 10.1.3.44 traps version 3 auth xxxxx RP/0/0/CPU0:R3(config)#snmp-server traps

Check Content

Verify that the router is configured to send traps to the SNMP manager. The SNMP configuration should contain commands similar to the example below. snmp-server host 10.1.3.44 traps private snmp-server traps rf snmp-server traps bfd snmp-server traps ethernet cfm snmp-server traps ntp snmp-server traps ethernet oam events snmp-server traps copy-complete snmp-server traps snmp linkup snmp-server traps snmp linkdown snmp-server traps snmp coldstart snmp-server traps snmp warmstart snmp-server traps snmp authentication … … … snmp-server traps entity-state operstatus snmp-server traps entity-state switchover snmp-server traps entity-redundancy all snmp-server traps entity-redundancy status snmp-server traps entity-redundancy switchover Note: The above is a subset of all the possible traps that can be enabled. Selective traps can be enabled as required. If the router is not configured to send traps to the SNMP manager, this is a finding.

V-96501

The Cisco router must be running an IOS release that is currently supported by Cisco Systems.

Finding ID

CISC-ND-001470

Rule ID

SV-105639r1_rule

Severity

Cat I

CCE

(None)

Group Title

SRG-APP-000516-NDM-000317

CCI

CCI-000366

Target Key

(None)

Documentable

Discussion

Network devices running an unsupported operating system lack current security fixes required to mitigate the risks associated with recent vulnerabilities. Running a supported release also enables operations to maintain a stable and reliable network provided by improved quality of service and security features.

Fix Text

Upgrade the router to a supported release.

Check Content

Verify that the router is in compliance with this requirement by having the router administrator enter the following command: show version Verify that the release is still supported by Cisco. All releases supported by Cisco can be found on the following URL: www.cisco.com/c/en/us/support/ios-nx-os-software If the router is not running a supported release, this is a finding.