cyberstrikeus Ensure noexec option set on /dev/shm partition
Description
The noexec mount option specifies that the filesystem cannot contain executable binaries.
Rationale
Setting this option on a file system prevents users from executing programs from shared memory. This deters users from introducing potentially malicious software on the system.
Impact
None noted.
Audit Procedure
Command Line
# Run the following command and verify that nothing is returned:
findmnt -n /dev/shm | grep -v noexec
Expected Result
No output should be returned.
Remediation
Command Line
# Edit the /etc/fstab file and add noexec 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 - 2.6 Address unapproved software: Ensure that unauthorized software is either removed or the inventory is updated in a timely manner.
Profile
Level 1 - Server / Level 1 - Workstation, Assessment: Automated