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The system must not accept ICMPv4 redirect packets on any interface.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-217915 | RHEL-06-000084 | SV-217915r505923_rule | Medium |
| Description |
|---|
| Accepting ICMP redirects has few legitimate uses. It should be disabled unless it is absolutely required. |
| STIG | Date |
|---|---|
| Red Hat Enterprise Linux 6 Security Technical Implementation Guide | 2020-09-03 |
Details
| Check Text ( C-19396r376760_chk ) |
|---|
| The status of the "net.ipv4.conf.all.accept_redirects" kernel parameter can be queried by running the following command: $ sysctl net.ipv4.conf.all.accept_redirects net.ipv4.conf.all.accept_redirects = 0 $ grep net.ipv4.conf.all.accept_redirects /etc/sysctl.conf /etc/sysctl.d/* net.ipv4.conf.all.accept_redirects = 0 If "net.ipv4.conf.all.accept_redirects" is not configured in the /etc/sysctl.conf file or in the /etc/sysctl.d/ directory, is commented out or does not have a value of "0", this is a finding. |
| Fix Text (F-19394r376761_fix) |
|---|
| To set the runtime status of the "net.ipv4.conf.all.accept_redirects" kernel parameter, run the following command: # sysctl -w net.ipv4.conf.all.accept_redirects=0 Set the system to the required kernel parameter by adding the following line to "/etc/sysctl.conf" or a config file in the /etc/sysctl.d/ directory (or modify the line to have the required value): net.ipv4.conf.all.accept_redirects = 0 Issue the following command to make the changes take effect: # sysctl --system |