1.1.12 Ensure /var/tmp partition includes the noexec option

Information

The noexec mount option specifies that the filesystem cannot contain executable binaries.

Rationale:

Since the /var/tmp filesystem is only intended for temporary file storage, set this option to ensure that users cannot run executable binaries from /var/tmp.

Solution

For existing /var/tmp partitions, edit the /etc/fstab file and add noexec 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,noexec /var/tmp

See Also

https://workbench.cisecurity.org/files/3397

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|2.6

Plugin: Unix

Control ID: 6c74c03a224d4fbce98fc4cd7ea39a9330f8085b2b502b3c73d7842fd8b1d143