1.1.3 Ensure nodev option set on /tmp partition

Information

The nodev mount option specifies that the filesystem cannot contain special devices.

Rationale:

Since the /tmp filesystem is not intended to support devices, set this option to ensure that users cannot attempt to create block or character special devices in /tmp.

Solution

If using the /etc/fstab for configuring /tmp do the following:
Edit the /etc/fstab file and add nodev to the fourth field (mounting options) for the /tmp partition. See the fstab(5) manual page for more information.
Run the following command to remount /tmp:

# mount -o remount,nodev /tmp

If using systemd tmp.mount for configuring /tmp do the following:
Edit /etc/systemd/system/local-fs.target.wants/tmp.mount and add the nodev option to the Options line
Example:

[Mount]
What=tmpfs
Where=/tmp
Type=tmpfs
Options=mode=1777,strictatime,noexec,nodev,nosuid

Run the following command to remount /tmp:

# mount -o remount,nosuid /tmp

Additional Information:

If the /etc/fstab includes /tmp it will take precedence over the tmp.mount file

See Also

https://workbench.cisecurity.org/files/3399

Item Details

Category: CONFIGURATION MANAGEMENT

References: 800-53|CM-6, CSCv6|13, CSCv7|5.1

Plugin: Unix

Control ID: 1ebd9fa0ba66bde6ef51ddebcf29b7dc4f7fa7196c2a939986fddd057d49ed2f