cyberstrikeus 1.1.15 Ensure nosuid option set on /run/shm partition (Scored)
Profile Applicability
- Level 1 - Server
- Level 1 - Workstation
Description
The nosuid mount option specifies that the filesystem cannot contain setuid files.
Rationale
Setting this option on a file system prevents users from introducing privileged programs onto the system and allowing non-root users to execute them.
Audit Procedure
mount | grep /run/shm
# Verify that the nosuid option is set on /run/shm
# Expected output: tmpfs on /run/shm type tmpfs (rw,nosuid,nodev,noexec,relatime)
Expected Result
The output should show the nosuid option is set for the /run/shm partition.
Remediation
# Edit the /etc/fstab file and add nosuid to the fourth field (mounting options)
# for the /run/shm partition. See the fstab(5) manual page for more information.
# Run the following command to remount /run/shm:
mount -o remount,nosuid /run/shm
Default Value
By default, the nosuid option is not set on /run/shm.
References
- CIS Ubuntu Linux 14.04 LTS Benchmark v2.1.0
Profile
- Level 1