Detections
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1.196 RHEL-09-254010

Information

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

GROUP ID: V-257971
RULE ID: SV-257971r991589

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 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.all.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-257971r991589_rule, STIG-ID|RHEL-09-254010, Vuln-ID|V-257971

Plugin: Unix

Control ID: 0a111567ce20c4ccd59b0c2cc7a3bd70ce6f41a4483986dab47151e1aee562f6