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
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
Item Details
Category: CONFIGURATION MANAGEMENT, SYSTEM AND SERVICES ACQUISITION
References: 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|SA-3, 800-53|SA-8, 800-53|SA-10, CSCv6|13, CSCv7|5.1
Control ID: 0d4420bf3e9952b90bc2cf6a5ab717f81b77112ee92bf714ad3141c23718b7ab