Detections
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1.197 RHEL-09-254015

Information

RHEL 9 must ignore IPv6 Internet Control Message Protocol (ICMP) redirect messages.

GROUP ID: V-257972
RULE ID: SV-257972r991589

An illicit ICMP redirect message could result in a man-in-the-middle attack.

Solution

Configure RHEL 9 to ignore IPv6 ICMP redirect messages.

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

net.ipv6.conf.all.accept_redirects = 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-257972r991589_rule, STIG-ID|RHEL-09-254015, Vuln-ID|V-257972

Plugin: Unix

Control ID: 160ef7f0191815ff1469029a52c9413ea0fb75752cd65d4b1b238492b0c62cf7