Finding ID | Version | Rule ID | IA Controls | Severity |
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V-216656 | CISC-RT-000180 | SV-216656r855817_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. Mask Reply 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 | 2023-05-30 |
Check Text ( C-17889r287925_chk ) |
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Review the router configuration and verify that ip mask-reply command is not enabled on any external interfaces as shown in the example below: interface GigabitEthernet0/1 ip address x.x.x.x 255.255.255.0 ip mask-reply If the ip mask-reply command is configured on any external interface, this is a finding. |
Fix Text (F-17887r287926_fix) |
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Disable ip mask-reply on all external interfaces as shown below: R4(config)#int g0/1 R4(config-if)#no ip mask-reply |