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RHEL 9 must mount /var with the nodev option.


Overview

Finding ID Version Rule ID IA Controls Severity
V-257869 RHEL-09-231140 SV-257869r958804_rule Medium
Description
The "nodev" mount option causes the system to not interpret character or block special devices. Executing character or block special devices from untrusted file systems increases the opportunity for nonprivileged users to attain unauthorized administrative access. The only legitimate location for device files is the "/dev" directory located on the root partition, with the exception of chroot jails if implemented.
STIG Date
Red Hat Enterprise Linux 9 Security Technical Implementation Guide 2024-06-04

Details

Check Text ( C-61610r925592_chk )
Verify "/var" is mounted with the "nodev" option:

$ mount | grep /var

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

If the "/var" file system is mounted without the "nodev" option, this is a finding.
Fix Text (F-61534r925593_fix)
Modify "/etc/fstab" to use the "nodev" option on the "/var" directory.