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The system must ignore ICMPv4 redirect messages by default.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-208859 | OL6-00-000091 | SV-208859r793644_rule | Low |
| Description |
|---|
| This feature of the IPv4 protocol has few legitimate uses. It should be disabled unless it is absolutely required. |
| STIG | Date |
|---|---|
| Oracle Linux 6 Security Technical Implementation Guide | 2021-12-03 |
Details
| Check Text ( C-9112r357557_chk ) |
|---|
| The status of the "net.ipv4.conf.default.accept_redirects" kernel parameter can be queried by running the following command: $ sysctl net.ipv4.conf.default.accept_redirects The output of the command should indicate a value of "0". If this value is not the default value, investigate how it could have been adjusted at runtime, and verify it is not set improperly in "/etc/sysctl.conf". $ grep net.ipv4.conf.default.accept_redirects /etc/sysctl.conf If the correct value is not returned, this is a finding. |
| Fix Text (F-9112r357558_fix) |
|---|
| To set the runtime status of the "net.ipv4.conf.default.accept_redirects" kernel parameter, run the following command: # sysctl -w net.ipv4.conf.default.accept_redirects=0 If this is not the system's default value, add the following line to "/etc/sysctl.conf": net.ipv4.conf.default.accept_redirects = 0 |