1.1.3.3 Ensure noexec option set on /var partition

Information

The noexec mount option specifies that the filesystem cannot contain executable binaries.

Rationale:

Since the /var filesystem is only intended for variable files such as logs, set this option to ensure that users cannot run executable binaries from /var.

Solution

Edit the /etc/fstab file and add noexec to the fourth field (mounting options) for the /var partition.
Example:

<device> /var <fstype> defaults,rw,nosuid,nodev,noexec,relatime 0 0

Run the following command to remount /var with the configured options:

# mount -o remount /var

See Also

https://workbench.cisecurity.org/files/3939

Item Details

Category: ACCESS CONTROL, MEDIA PROTECTION

References: 800-53|AC-3, 800-53|AC-5, 800-53|AC-6, 800-53|MP-2, CSCv7|14.6

Plugin: Unix

Control ID: 0122a317c26a438ba71b110d5a46a1c630a2b095947fc882768e398f4204606c