Details
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
Supportive Information
The following resource is also helpful.
This security hardening control applies to the following category of controls within NIST 800-53: Access Control, Configuration Management, Identification and Authentication, Media Protection.This control applies to the following type of system Unix.