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ICMP unreachable notifications, mask replies, and redirects must be disabled on all external interfaces.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-3084 | NET0800 | SV-3084r2_rule | ECSC-1 | Medium |
| Description |
|---|
| The Internet Control Message Protocol (ICMP) supports IP traffic by relaying information about paths, routes, and network conditions. Routers automatically send ICMP messages under a wide variety of conditions. Three ICMP messages are commonly used by attackers for network mapping and diagnosis: Host unreachable, Redirect, and Mask Reply. |
| STIG | Date |
|---|---|
| Perimeter Router Security Technical Implementation Guide | 2018-08-23 |
Details
| Check Text ( C-3580r3_chk ) |
|---|
| Review the device configuration to determine if controls have been defined to ensure the router does not send ICMP unreachables, redirects, and mask replies out to any external interfaces. If ICMP unreachables notifications, mask replies, and redirects are enabled on external interfaces, this is a finding. |
| Fix Text (F-3109r3_fix) |
|---|
| Disable ICMP unreachable notifications, mask replies, and redirects on all external interfaces. |