cyberstrikeus Ensure nodev option set on /dev/shm partition
Description
The nodev mount option specifies that the filesystem cannot contain special devices.
Rationale
Since the /dev/shm filesystem is not intended to support devices, set this option to ensure that users cannot attempt to create special devices in /dev/shm partitions.
Impact
None noted.
Audit Procedure
Command Line
# Run the following command and verify that nothing is returned:
findmnt -n /dev/shm | grep -v nodev
Expected Result
No output should be returned.
Remediation
Command Line
# Edit the /etc/fstab file and add nodev to the fourth field (mounting options) for the /dev/shm partition.
# See the fstab(5) manual page for more information.
# Run the following command to remount /dev/shm:
mount -o remount,nosuid,nodev,noexec /dev/shm
Default Value
Not set by default.
References
- CIS Controls Version 7 - 5.1 Establish Secure Configurations: Maintain documented, standard security configuration standards for all authorized operating systems and software.
Profile
Level 1 - Server / Level 1 - Workstation, Assessment: Automated