The Cisco switch must be configured to have Internet Control Message Protocol (ICMP) redirect messages disabled on all external interfaces.
Severity | Group ID | Group Title | Version | Rule ID | Date | STIG Version |
|---|---|---|---|---|---|---|
| medium | V-220435 | SRG-NET-000362-RTR-000115 | CISC-RT-000190 | SV-220435r856237_rule | 2024-06-06 | 3 |
| 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. |
| ℹ️ Check |
|---|
| 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 GigabitEthernet0/1 ip address x.x.x.x 255.255.255.0 no ip redirects If ICMP Redirect messages are enabled on any external interfaces, this is a finding. |
| ✔️ Fix |
|---|
| Disable ICMP redirects on all external interfaces as shown in the example below: SW1(config)#int g0/1 SW1(config-if)#no ip redirects |