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1.1.14 Ensure /var/tmp partition includes the nosuid option

Information

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

Rationale:

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 .

Solution

For existing /var/tmp partitions, edit the /etc/fstab file and add nosuid to the fourth field (mounting options) of the /var/tmp entry. See the fstab(5) manual page for more information.
Run the following command to remount /var/tmp :

# mount -o remount,nosuid /var/tmp

See Also

https://workbench.cisecurity.org/files/3468

Item Details

Category: ACCESS CONTROL, CONFIGURATION MANAGEMENT, MEDIA PROTECTION, SYSTEM AND SERVICES ACQUISITION

References: 800-53|AC-3, 800-53|AC-5, 800-53|AC-6, 800-53|CM-1, 800-53|CM-2, 800-53|CM-6, 800-53|CM-7, 800-53|CM-7(1), 800-53|CM-9, 800-53|MP-2, 800-53|SA-3, 800-53|SA-8, 800-53|SA-10, CSCv7|5.1, CSCv7|13

Plugin: Unix

Control ID: 2a9a29eadbbbc6e6d7e94e72ad091a2763a45df8e263f5c791f151b53e7f371d