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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-221085r622190_rule 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 2021-03-29

Details

Check Text ( C-22800r409744_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