1.1.3.4 Ensure nosuid option set on /var partition

Information

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

Rationale:

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

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,noexec,relatime 0 0

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

# mount -o remount /var

See Also

https://workbench.cisecurity.org/files/3807

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: 52968966ff0ead1625dcb152df809931aa73c54d181d5cb2f1eb6e0b5d0908f1