Detections
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1.186 RHEL-09-253030

Information

RHEL 9 must log IPv4 packets with impossible addresses by default.

GROUP ID: V-257961RULE ID: SV-257961r991589

The presence of "martian" packets (which have impossible addresses) as well as spoofed packets, source-routed packets, and redirects could be a sign of nefarious network activity. Logging these packets enables this activity to be detected.

Solution

Configure RHEL 9 to log martian packets on IPv4 interfaces by default.

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

net.ipv4.conf.default.log_martians=1

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-257961r991589_rule, STIG-ID|RHEL-09-253030, Vuln-ID|V-257961

Plugin: Unix

Control ID: 091ea042eec5787f283e93dba3917caa53a9eb8abaf080d540b5e714ef21ed91