Details

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. Redirect 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 ICMP redirects on all external interfaces as shown in the example below:

SW1(config)#int g0/1
SW1(config-if)#no ip redirects

Supportive Information

The following resource is also helpful.

• https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_Cisco_IOS_Switch_Y21M07_STIG.zip

This security hardening control applies to the following category of controls within NIST 800-53: System and Communications Protection.This control applies to the following type of system Cisco.

References

• 800-53|SC-5
• CAT|II
• CCI|CCI-002385
• Rule-ID|SV-220435r622190_rule
• STIG-ID|CISC-RT-000190
• STIG-Legacy|SV-110717
• STIG-Legacy|V-101613
• Vuln-ID|V-220435

Source

• Tenable.com/audits