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V-101615

The Cisco switch must be configured to log all packets that have been dropped at interfaces via an access control list (ACL).

Finding ID
CISC-RT-000200
Rule ID
SV-110719r1_rule
Severity
Cat III
CCE
(None)
Group Title
SRG-NET-000078-RTR-000001
CCI
CCI-000134
Target Key
(None)
Documentable
No
Discussion

Auditing and logging are key components of any security architecture. It is essential for security personnel to know what is being done or attempted to be done, and by whom, to compile an accurate risk assessment. Auditing the actions on network devices provides a means to recreate an attack or identify a configuration mistake on the device.

Fix Text

Configure ACLs to log packets that are dropped as shown in the example below: SW1(config)#ip access-list extended INGRESS_FILTER … … … SW1(config-ext-nacl)#deny ip any any log

Check Content

Review all ACLs used to filter traffic and verify that packets being dropped at interfaces via an ACL are logged as shown in the configuration below: ip access-list extended INGRESS_FILTER permit tcp any any established permit tcp any host x.11.1.5 eq www permit icmp host x.11.1.1 host x.11.1.2 echo permit icmp any any echo-reply … … … deny ip any any log If packets being dropped are not logged, this is a finding.