InformationThe noexec mount option specifies that the filesystem cannot contain executable binaries.
Setting this option on a file system prevents users from executing programs from shared memory. This deters users from introducing potentially malicious software on the system.
SolutionEdit the /etc/fstab file and add noexec to the fourth field (mounting options) for the /dev/shm partition. See the fstab(5) manual page for more information.
Example: vim /etc/fstab
Run the following command to remount /dev/shm:
# mount -o remount,noexec /dev/shm
Some distributions mount /dev/shm through other means and require /dev/shm to be added to /etc/fstab even though it is already being mounted on boot. Others may configure /dev/shm in other locations and may override /etc/fstab configuration. Consult the documentation appropriate for your distribution.
This Benchmark recommendation maps to:
Red Hat Enterprise Linux 7 Security Technical Implementation Guide:
Version 2, Release: 3 Benchmark Date: 26 Apr 2019
Vul ID: V-81013
Rule ID: SV-95725r2_rule
STIG ID: RHEL-07-021024
Severity: CAT III