The Cisco switch must be configured to have Internet Control Message Protocol (ICMP) redirect messages disabled on all external interfaces.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-221085 | CISC-RT-000190 | SV-221085r999694_rule | CCI-002385 | medium |
| Description | ||||
| 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. | ||||
| STIG | Date | |||
| Cisco NX OS Switch RTR Security Technical Implementation Guide | 2024-12-20 | |||
Details
Check Text (C-221085r999694_chk)
Review the switch configuration to verify that the no ip redirects command has been configured on all external interfaces as shown in the example below:
interface Ethernet2/7
no switchport
ip address x.22.4.2/30
no ip redirects
If ICMP Redirect messages are enabled on any external interfaces, this is a finding.
Fix Text (F-22789r409745_fix)
Disable ICMP redirects on all external interfaces as shown in the example below:
SW1(config)# int e2/7
SW1(config-if)# no ip redirects