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The system must not send ICMPv4 redirects by default.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-208850 | OL6-00-000080 | SV-208850r603263_rule | Medium |
| Description |
|---|
| Sending ICMP redirects permits the system to instruct other systems to update their routing information. The ability to send ICMP redirects is only appropriate for systems acting as routers. |
| STIG | Date |
|---|---|
| Oracle Linux 6 Security Technical Implementation Guide | 2021-06-14 |
Details
| Check Text ( C-9103r357530_chk ) |
|---|
| The status of the "net.ipv4.conf.default.send_redirects" kernel parameter can be queried by running the following command: $ sysctl net.ipv4.conf.default.send_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.send_redirects /etc/sysctl.conf If the correct value is not returned, this is a finding. |
| Fix Text (F-9103r357531_fix) |
|---|
| To set the runtime status of the "net.ipv4.conf.default.send_redirects" kernel parameter, run the following command: # sysctl -w net.ipv4.conf.default.send_redirects=0 If this is not the system's default value, add the following line to "/etc/sysctl.conf": net.ipv4.conf.default.send_redirects = 0 |