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The Red Hat Enterprise Linux operating system must mount /dev/shm with the nodev option.


Overview

Finding ID Version Rule ID IA Controls Severity
V-81009 RHEL-07-021022 SV-95721r1_rule Low
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 unprivileged users to attain unauthorized administrative access.
STIG Date
Red Hat Enterprise Linux 7 Security Technical Implementation Guide 2018-11-28

Details

Check Text ( C-80723r1_chk )
Verify that the "nodev" option is configured for /dev/shm.

Check that the operating system is configured to use the "nodev" option for /dev/shm with the following command:

# cat /etc/fstab | grep /dev/shm | grep nodev

tmpfs /dev/shm tmpfs defaults,nodev,nosuid,noexec 0 0

If the "nodev" option is not present on the line for "/dev/shm", this is a finding.

Verify "/dev/shm" is mounted with the "nodev" option:

# mount | grep "/dev/shm" | grep nodev

If no results are returned, this is a finding.
Fix Text (F-87843r1_fix)
Configure the "/etc/fstab" to use the "nodev" option for all lines containing "/dev/shm".