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The router must be configured to have Internet Control Message Protocol (ICMP) redirects disabled on all external interfaces.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-78227 | SRG-NET-000362-RTR-000115 | SV-92933r1_rule | Medium |
| Description |
|---|
| 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 |
|---|---|
| Router Security Requirements Guide | 2020-06-30 |
Details
| Check Text ( C-77783r1_chk ) |
|---|
| Review the device configuration to determine if controls have been defined to ensure the router does not send ICMP Redirect messages out to any external interfaces. If ICMP Redirect messages are enabled on any external interfaces, this is a finding. |
| Fix Text (F-84955r1_fix) |
|---|
| Disable ICMP redirects on all external interfaces. |