1.1.9 Ensure nosuid option set on /var/tmp partition (Scored)

Level 1 - Server 
Level 1 - Workstation

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

Since the /var/tmp filesystem is only intended for temporary file storage, set this option to ensure that users cannot create setuid files in /var/tmp.

If a /var/tmp partition exists run the following command and verify that the nosuid option is set on /var/tmp.

# mount | grep /var/tmp 
tmpfs on /var/tmp type tmpfs (rw,nosuid,nodev,noexec,relatime)

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

# mount -o remount,nosuid /var/tmp