cyberstrikeus Ensure nosuid option set on /dev/shm partition
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.
Impact
None noted.
Audit Procedure
Command Line
# Run the following command and verify that nothing is returned:
findnmt -n /dev/shm | grep -v nosuid
Expected Result
No output should be returned.
Remediation
Command Line
# Edit the /etc/fstab file and add nosuid 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