Title

RHEL 9 must prevent device files from being interpreted on file systems that contain user home directories. (Cat II impact)

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 Content

Verify "/home" is mounted with the "nodev" option with the following command: Note: If a separate file system has not been created for the user home directories (user home directories are mounted under "/"), this is automatically a finding, as the "nodev" option cannot be used on the "/" system. $ mount | grep /home tmpfs on /home type tmpfs (rw,nodev,nosuid,noexec,seclabel) If the "/home" file system is mounted without the "nodev" option, this is a finding.

Fix Text

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

Additional Identifiers

Rule ID: SV-257850r925537_rule

Vulnerability ID: V-257850

Group Title: SRG-OS-000368-GPOS-00154

Expert Comments

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