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RHEL-10-800110 RHEL 10 must log Internet Protocol version 4 (IPv4) packets with impossible addresses.

DISA STIG library V1R3
All changes in this version
first version loaded CAT II

Maps to SC-5, SC-7 via CCI-002385, CCI-001098

Title

RHEL 10 must log Internet Protocol version 4 (IPv4) packets with impossible addresses.

Control

Verify RHEL 10 logs IPv4 martian packets. Check the value of the "net.ipv4.conf.all.log_martians" variable with the following command: $ sudo sysctl net.ipv4.conf.all.log_martians net.ipv4.conf.all.log_martians = 1 If "net.ipv4.conf.all.log_martians" is not set to "1" or is missing, this is a finding.

Discussion

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. Satisfies: SRG-OS-000420-GPOS-00186, SRG-OS-000142-GPOS-00074

Related controls

CCI-001098, CCI-002385

Fix

Configure RHEL 10 to log martian packets on IPv4 interfaces. Create a configuration file if it does not already exist: $ sudo vi /etc/sysctl.d/99-ipv4_log_martians.conf Add the following line to the file: net.ipv4.conf.all.log_martians=1 Reload settings from all system configuration files with the following command: $ sudo sysctl --system