Detections
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RHEL-10-800100 - RHEL 10 must not forward Internet Protocol version 4 (IPv4) source-routed packets.
Information
Source-routed packets allow the source of the packet to suggest that routers forward the packet along a different path than configured on the router, which can be used to bypass network security measures. This requirement applies only to the forwarding of source-routed traffic, such as when IPv4 forwarding is enabled and the system is functioning as a router.Accepting source-routed packets in the IPv4 protocol has few legitimate uses. It must be disabled unless it is absolutely required.
Satisfies: SRG-OS-000420-GPOS-00186, SRG-OS-000142-GPOS-00073
Solution
Configure RHEL 10 to ignore IPv4 source-routed packets.Create a configuration file if it does not already exist:
$ sudo vi /etc/sysctl.d/99-ipv4_accept_source.conf
Add the following line to the file:
net.ipv4.conf.all.accept_source_route = 0
Reload settings from all system configuration files with the following command:
$ sudo sysctl --system
See Also
https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_RHEL_10_V1R1_STIG.zip
Item Details
Audit Name: DISA Red Hat Enterprise Linux 10 STIG v1r1
Category: SYSTEM AND COMMUNICATIONS PROTECTION
References: 800-53|SC-5, 800-53|SC-7a., CAT|II, CCI|CCI-001097, CCI|CCI-002385, Rule-ID|SV-281342r1167176_rule, STIG-ID|RHEL-10-800100, Vuln-ID|V-281342
Plugin: Unix
Control ID: aed7a21e19ae1fe74b259fa1278ba2800a21ff621c6c511743c0d9525d673c3e