Detections
Analytics

1.11 CISC-RT-000170

Information

The Cisco switch must be configured to have Internet Control Message Protocol (ICMP) unreachable messages disabled on all external interfaces.

Group ID: V-221084
Rule ID: SV-221084r999693

The ICMP supports IP traffic by relaying information about paths, routes, and network conditions. Switches automatically send ICMP messages under a wide variety of conditions. Host unreachable ICMP messages are commonly used by attackers for network mapping and diagnosis.

NOTE: Nessus has provided the target output to assist in reviewing the benchmark to ensure target compliance.

Solution

Disable ip unreachables on all external interfaces as shown below:

SW1(config)# int e2/7
SW1(config-if)# no ip unreachables
SW1(config-if)# end

See Also

https://workbench.cisecurity.org/benchmarks/26426

Item Details

Category: SECURITY ASSESSMENT AND AUTHORIZATION, SYSTEM AND COMMUNICATIONS PROTECTION

References: 800-53|CA-9, 800-53|SC-5, 800-53|SC-7, 800-53|SC-7(5), CSCv7|12.4, Rule-ID|SV-221084r999693_rule, STIG-ID|CISC-RT-000170, Vuln-ID|V-221084

Plugin: Cisco

Control ID: 5bedbc16d60379196053ea112c01df0088b0b76ed53922ea5eeb1b4f05b85b57