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The Red Hat Enterprise Linux operating system must mount /dev/shm with secure options.


Overview

Finding ID Version Rule ID IA Controls Severity
V-204486 RHEL-07-021024 SV-204486r853900_rule Low
Description
The "noexec" mount option causes the system to not execute binary files. This option must be used for mounting any file system not containing approved binary files as they may be incompatible. Executing files from untrusted file systems increases the opportunity for unprivileged users to attain unauthorized administrative access. 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. The "nosuid" mount option causes the system to not execute "setuid" and "setgid" files with owner privileges. This option must be used for mounting any file system not containing approved "setuid" and "setguid" files. Executing files 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 2022-09-12

Details

Check Text ( C-4610r462552_chk )
Verify that the "nodev","nosuid", and "noexec" options are configured for /dev/shm:

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

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

If results are returned and the "nodev", "nosuid", or "noexec" options are missing, this is a finding.

Verify "/dev/shm" is mounted with the "nodev", "nosuid", and "noexec" options:

# mount | grep /dev/shm

tmpfs on /dev/shm type tmpfs (rw,nodev,nosuid,noexec,seclabel)

If /dev/shm is mounted without secure options "nodev", "nosuid", and "noexec", this is a finding.
Fix Text (F-4610r462553_fix)
Configure the system so that /dev/shm is mounted with the "nodev", "nosuid", and "noexec" options by adding /modifying the /etc/fstab with the following line:

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