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


Finding ID Version Rule ID IA Controls Severity
V-221003 CISC-RT-000200 SV-221003r622190_rule Low
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.
Cisco IOS XE Switch RTR Security Technical Implementation Guide 2023-09-13


Check Text ( C-22718r408803_chk )
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 host x.11.1.1 eq bgp host x.11.1.2
permit tcp host x.11.1.1 host x.11.1.2 eq bgp
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.
Fix Text (F-22707r408804_fix)
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