Detections
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1.200 RHEL-09-254030

Information

RHEL 9 must not accept router advertisements on all IPv6 interfaces by default.

GROUP ID: V-257975
RULE ID: SV-257975r991589

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

Solution

Configure RHEL 9 to not accept router advertisements on all IPv6 interfaces by default unless the system is a router.

Add or edit the following line in a single system configuration file, in the "/etc/sysctl.d/" directory:

net.ipv6.conf.default.accept_ra = 0

Load settings from all system configuration files with the following command:

$ sudo sysctl --system

See Also

https://workbench.cisecurity.org/benchmarks/22008

Item Details

Category: CONFIGURATION MANAGEMENT

References: 800-53|CM-6b., CAT|II, CCI|CCI-000366, Rule-ID|SV-257975r991589_rule, STIG-ID|RHEL-09-254030, Vuln-ID|V-257975

Plugin: Unix

Control ID: 8e183fdda8899b6b39b07caa0885a70202e6f17d18e7ead0cda6dc201579c7a7