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RHEL 9 must mount /var/log with the nosuid option.


Overview

Finding ID Version Rule ID IA Controls Severity
V-257872 RHEL-09-231155 SV-257872r958804_rule Medium
Description
The "nosuid" mount option causes the system to not execute "setuid" and "setgid" files with owner privileges. This option must be used for mounting any file system not containing approved "setuid" and "setguid" files. Executing files from untrusted file systems increases the opportunity for nonprivileged users to attain unauthorized administrative access.
STIG Date
Red Hat Enterprise Linux 9 Security Technical Implementation Guide 2024-06-04

Details

Check Text ( C-61613r925601_chk )
Verify "/var/log" is mounted with the "nosuid" option:

$ mount | grep /var/log

/dev/mapper/rhel-var-log on /var/log type xfs (rw,nodev,nosuid,noexec,seclabel)

If the "/var/log" file system is mounted without the "nosuid" option, this is a finding.
Fix Text (F-61537r925602_fix)
Modify "/etc/fstab" to use the "nosuid" option on the "/var/log" directory.