Finding ID | Version | Rule ID | IA Controls | Severity |
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V-216657 | CISC-RT-000190 | SV-216657r531086_rule | Medium |
Description |
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The ICMP supports IP traffic by relaying information about paths, routes, and network conditions. Routers 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 |
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Cisco IOS XE Router RTR Security Technical Implementation Guide | 2020-09-23 |
Check Text ( C-17890r287928_chk ) |
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Review the router 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 Text (F-17888r287929_fix) |
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Disable ICMP redirects on all external interfaces as shown in the example below: R4(config)#int g0/1 R4(config-if)#no ip redirects |