Detections
Analytics

CISC-RT-000170 - The Cisco switch must be configured to have Internet Control Message Protocol (ICMP) unreachable messages disabled on all external interfaces - ICMP unreachable messages disabled on all external interfaces

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This audit has been deprecated and will be removed in a future update.

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Information

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.

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://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_Cisco_NX-OS_Switch_Y24M04_STIG.zip

Item Details

References: CAT|II, CCI|CCI-002385, Rule-ID|SV-221084r856637_rule, STIG-ID|CISC-RT-000170, STIG-Legacy|SV-110987, STIG-Legacy|V-101883, Vuln-ID|V-221084

Plugin: Cisco

Control ID: d3a93923582aa8ce078c0ce0d50a360edccd3476800c9b2c2d9cd41ba81b3859