cyberstrikeus 1.1.9 Ensure noexec option set on /var/tmp partition (Scored)
Profile Applicability
- Level 1 - Server
- Level 1 - Workstation
Description
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.
Audit Procedure
mount | grep /var/tmp
# Verify that the noexec option is set on /var/tmp
# Expected output: tmpfs on /var/tmp type tmpfs (rw,nosuid,nodev,noexec,relatime)
Expected Result
The output should show the noexec option is set for the /var/tmp partition.
Remediation
# 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
Default Value
By default, the noexec option is not set on /var/tmp.
References
- CIS Ubuntu Linux 14.04 LTS Benchmark v2.1.0
- CIS Controls: 2 Inventory of Authorized and Unauthorized Software
Profile
- Level 1