cyberstrikeus Ensure nodev option set on removable media partitions
Description
The nodev mount option specifies that the filesystem cannot contain special devices.
Rationale
Removable media containing character and block special devices could be used to circumvent security controls by allowing non-root users to access sensitive device files such as /dev/kmem or the raw disk partitions.
Impact
None noted.
Audit Procedure
Command Line
# Run the following command and verify that the nodev option is set on all removable media partitions.
mount
Expected Result
Verify that the nodev option is set on all removable media partitions.
Remediation
Command Line
# Edit the /etc/fstab file and add nodev to the fourth field (mounting options) of all removable media partitions.
# Look for entries that have mount points that contain words such as floppy or cdrom.
# See the fstab(5) manual page for more information.
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: Manual