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

From Red Hat Enterprise Linux 7 Security Technical Implementation Guide

Associated with: CCI-001764

SV-95721r1_rule The Red Hat Enterprise Linux operating system must mount /dev/shm with the nodev option.

Vulnerability 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 unprivileged users to attain unauthorized administrative access.

Check content

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

Configure the "/etc/fstab" to use the "nodev" option for all lines containing "/dev/shm".

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