Finding ID | Version | Rule ID | IA Controls | Severity |
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RHEL-06-000086 | RHEL-06-000086 | RHEL-06-000086_rule | Medium |
Description |
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Accepting "secure" ICMP redirects (from those gateways listed as default gateways) has few legitimate uses. It should be disabled unless it is absolutely required. |
STIG | Date |
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Red Hat Enterprise Linux 6 Security Technical Implementation Guide | 2013-02-05 |
Check Text ( C-RHEL-06-000086_chk ) |
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The status of the "net.ipv4.conf.all.secure_redirects" kernel parameter can be queried by running the following command: $ sysctl net.ipv4.conf.all.secure_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". If the correct value is not returned, this is a finding. |
Fix Text (F-RHEL-06-000086_fix) |
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To set the runtime status of the "net.ipv4.conf.all.secure_redirects" kernel parameter, run the following command: # sysctl -w net.ipv4.conf.all.secure_redirects=0 If this is not the system's default value, add the following line to "/etc/sysctl.conf": net.ipv4.conf.all.secure_redirects = 0 |