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RHEL-10-800240 - RHEL 10 must not forward Internet Protocol version 6 (IPv6) 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 forwarding is enabled and the system is functioning as a router.

Satisfies: SRG-OS-000420-GPOS-00186, SRG-OS-000142-GPOS-00087

Solution

Configure RHEL 10 to not accept IPv6 source-routed packets.

Create a configuration file if it does not already exist:

$ sudo vi /etc/sysctl.d/ipv6_accept_source_route.conf

Add the following line to the file:

net.ipv6.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

Category: SYSTEM AND COMMUNICATIONS PROTECTION

References: 800-53|SC-5, 800-53|SC-7(7), CAT|II, CCI|CCI-001111, CCI|CCI-002385, Rule-ID|SV-281356r1167218_rule, STIG-ID|RHEL-10-800240, Vuln-ID|V-281356

Plugin: Unix

Control ID: 9363e588b7d7579bbc8a4210f649f4cb11dbc609f0c5ac201ab1f4fa712b7801