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

Edit the /etc/fstab file and add noexec 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,noexec /var/tmp

Supportive Information

The following resource is also helpful.

• https://workbench.cisecurity.org/files/3148https://workbench.cisecurity.org/files/3148

This security hardening control applies to the following category of controls within NIST 800-53: Configuration Management.This control applies to the following type of system Unix.

References

• 800-53|CM-11
• CSCv6|3.1
• CSCv7|2.6

Source

• Tenable.com/audits