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RHEL-10-800220 - RHEL 10 must not accept router advertisements on all Internet Protocol version 6 (IPv6) interfaces.

Information

An illicit router advertisement message could result in a man-in-the-middle attack.

Satisfies: SRG-OS-000420-GPOS-00186, SRG-OS-000142-GPOS-00085

Solution

Configure RHEL 10 to not accept router advertisements on all IPv6 interfaces, unless the system is a router.

Create a configuration file if it does not already exist:

$ sudo vi /etc/sysctl.d/ipv4_accept_ra.conf

Add the following line to the file:

net.ipv6.conf.all.accept_ra = 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(5), CAT|II, CCI|CCI-001109, CCI|CCI-002385, Rule-ID|SV-281354r1167212_rule, STIG-ID|RHEL-10-800220, Vuln-ID|V-281354

Plugin: Unix

Control ID: b5c7938f0c44cf9961786836d2eca1670c955f3712942c245a032fca7ffc34b7