RHEL 9 must prevent device files from being interpreted on file systems that contain user home directories.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-257850	RHEL-09-231045	SV-257850r925537_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.

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	2023-12-01

Details

Check Text ( C-61591r925535_chk )
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.

Check Text ( C-61591r925535_chk )

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 (F-61515r925536_fix)
Modify "/etc/fstab" to use the "nodev" option on the "/home" directory.