Amazon Linux 2023 must mount /dev/shm with the nosuid option.

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 nonprivileged users to attain unauthorized administrative access.

Verify "/dev/shm" is mounted with the "nosuid" option with the following command:

$ mount | grep /dev/shm tmpfs on /dev/shm type tmpfs (rw,nodev,nosuid,noexec,seclabel)

If the /dev/shm file system is not mounted with the "nosuid" option, this is a finding.

Configure Amazon Linux 2023 so that "/dev/shm" is mounted with the "nosuid" option.

Modify "/etc/fstab" to use the "nosuid" option on the "/dev/shm" file system.