RHEL 9 must mount /var/tmp with the nodev option.

Documentable No

Rule ID SV-257876r958804_rule

CCI References

CCI-001764

Discussion

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.

Check Procedure

Verify "/var/tmp" is mounted with the "nodev" option:

$ mount | grep /var/tmp

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

If the "/var/tmp" file system is mounted without the "nodev" option, this is a finding.

Fix Action

Modify "/etc/fstab" to use the "nodev" option on the "/var/tmp" directory.