1.1.3.3 Ensure nosuid option set on /var partition

Information

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

Since the /var filesystem is only intended for variable files such as logs, set this option to ensure that users cannot create setuid files in /var

Solution

IF the /var partition exists, edit the /etc/fstab file and add nosuid to the fourth field (mounting options) for the /var partition.

Example:

<device> /var <fstype> defaults,rw,nosuid,nodev,relatime 0 0

Run the following command to remount /var with the configured options:

# mount -o remount /var

See Also

https://workbench.cisecurity.org/benchmarks/15023