Detections
Analytics

1.442 OL09-00-006044

Information

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

GROUP ID: V-271881
RULE ID: SV-271881r1092355

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

Solution

Configure OL 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/27024

Item Details

Category: CONFIGURATION MANAGEMENT

References: 800-53|CM-6b., CCI|CCI-000366, Rule-ID|SV-271881r1092355_rule, STIG-ID|OL09-00-006044, Vuln-ID|V-271881

Plugin: Unix

Control ID: 7bd2ad8054836ea73d5b28453f5828fbd0117844d5874d50b7a6b1bae37957af