1.1.8.3 Ensure nosuid option set on /dev/shm partition

Information

The nosuid mount option specifies that the filesystem cannot contain setuid files.

Rationale:

Setting this option on a file system prevents users from introducing privileged programs onto the system and allowing non-root users to execute them.

Solution

Edit the /etc/fstab file and add nosuid to the fourth field (mounting options) for the /dev/shm partition. See the fstab(5) manual page for more information.
Run the following command to remount /dev/shm using the updated options from /etc/fstab:

# mount -o remount /dev/shm

Additional Information:

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.

NIST SP 800-53 Rev. 5:

AC-3

MP-2

See Also

https://workbench.cisecurity.org/files/3939

Item Details

Category: ACCESS CONTROL, MEDIA PROTECTION

References: 800-53|AC-3, 800-53|AC-5, 800-53|AC-6, 800-53|MP-2, CSCv7|14.6

Plugin: Unix

Control ID: 99f929a9a76e2908cb8df0319a513bc50e4c633c280f2d21cc41709ea1c1c9a8