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Microsoft Lync 2013 STIG

Version 1 Release 41
2018-04-272015-04-13
U_MSicrosoft_Office_Lync_2013_V1R1_STIG_VSCAP_1R4-1_MaBenuchmalrk-xccdf.xml
The Microsoft Lync 2013 Security Technical Implementation Guide (STIG) is published as a tool to improve the security of Department of Defense (DoD) information systems. Comments or proposed revisions to this document should be sent via e-mail to the following address: disa.stig_spt@mail.mil.

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Vulnerabilities (3)

The ability of Lync to store user passwords must be disabled.

Finding ID
DTOO420
Rule ID
SV-52834r1_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO420 - Store user passwords
CCI
CCI-000196001632
Target Key
(None)
Documentable
No
Discussion

Lync 2013 provides a single, unified client for real-time communications, including voice and video calls, Lync Meetings, presence, instant messaging, and persistent chat. These features require the ability to log into the service with a username and password. The Lync client could potentially be configured to store user passwords locally which would allow it to be susceptible to compromise and to be used maliciously.

Fix Text

Set the policy value for Computer Configuration -> Administrative Templates -> Microsoft Lync 2013 -> Microsoft Lync Feature Policies "Allow storage of user passwords" to "Disabled".

Check Content

Verify the policy value for Computer Configuration -> Administrative Templates -> Microsoft Lync 2013 -> Microsoft Lync Feature Policies "Allow storage of user passwords" is set to "Disabled". Procedure: Use the Windows Registry Editor to navigate to the following key: HKLM\Software\Policies\Microsoft\office\15.0\lync Criteria: If the value savepassword is REG_DWORD = 0, this is not a finding.

Responsibility

System Administrator

Session Initiation Protocol (SIP) security mode must be configured.

Finding ID
DTOO421
Rule ID
SV-52835r1_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO421 - Session Initiation Protocol (SIP) security mode
CCI
CCI-001184001632
Target Key
(None)
Documentable
No
Discussion

Lync 2013 provides a single, unified client for real-time communications, including voice and video calls, Lync Meetings, presence, instant messaging, and persistent chat, using the Session Initiation Protocol (SIP). SIP is widely used for controlling multimedia communication sessions, such as voice and video calls over Internet Protocol (IP) networks. By using TLS it would render a sniff/man in the middle attack very difficult to impossible to achieve within the time period in which a given conversation could be attacked. TLS authenticates all parties and encrypts all traffic. This does not prevent listening over the wire, but the attacker cannot read the traffic unless the encryption is broken.

Fix Text

Set the policy value for Computer Configuration -> Administrative Templates -> Microsoft Lync 2013 -> Microsoft Lync Feature Policies "Configure SIP security mode" to "Enabled".

Check Content

Verify the policy value for Computer Configuration -> Administrative Templates -> Microsoft Lync 2013 -> Microsoft Lync Feature Policies "Configure SIP security mode" is set to "Enabled". Procedure: Use the Windows Registry Editor to navigate to the following key: HKLM\Software\Policies\Microsoft\office\15.0\lync Criteria: If the value enablesiphighsecuritymode is REG_DWORD = 1, this is not a finding.

Responsibility

System Administrator

In the event a secure Session Initiation Protocol (SIP) connection fails, the connection must be restricted from resorting to the unencrypted HTTP.

Finding ID
DTOO422
Rule ID
SV-52836r2_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO422 - Session Initiation Protocol (SIP)
CCI
CCI-001184001632
Target Key
(None)
Documentable
No
Discussion

Lync 2013 provides a single, unified client for real-time communications, including voice and video calls, Lync Meetings, presence, instant messaging, and persistent chat. The Lync client has a fall back option so that, in the event the Lync client cannot make a secure SIP connection to the Lync server, it will fall back to an unencrypted HTTP connection. In that event, all traffic will be unencrypted and in clear text. The configuration must be set to prevent HTTP being used for SIP connections in the event TLS or TCP fail.

Fix Text

Set the policy value for Computer Configuration -> Administrative Templates -> Microsoft Lync 2013 -> Microsoft Lync Feature Policies "Disable HTTP fallback for SIP connection" to "Enabled".

Check Content

Verify the policy value for Computer Configuration -> Administrative Templates -> Microsoft Lync 2013 -> Microsoft Lync Feature Policies "Disable HTTP fallback for SIP connection" is set to "Enabled". Procedure: Use the Windows Registry Editor to navigate to the following key: HKLM\Software\Policies\Microsoft\office\15.0\lync Criteria: If the value disablehttpconnect is REG_DWORD = 1, this is not a finding.

Responsibility

System Administrator