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1.1.2.7.3 Ensure nosuid option set on /var/log/audit partition

Information

The nosuid mount option specifies that the filesystem cannot contain setuid files.

Since the /var/log/audit filesystem is only intended for variable files such as logs, set this option to ensure that users cannot create setuid files in /var/log/audit.

Solution

- IF - a separate partition exists for /var/log/audit.

Edit the /etc/fstab file and add nosuid to the fourth field (mounting options) for the /var/log/audit partition.

Example:

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

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

# mount -o remount /var/log/audit

Impact:

Setting the nosuid option prevents setuid and setgid bits from taking effect on the /var/log/audit filesystem, which is not expected to contain privileged executables; this typically has no operational impact.

See Also

https://workbench.cisecurity.org/benchmarks/27891

Item Details

Category: ACCESS CONTROL, CONFIGURATION MANAGEMENT, MEDIA PROTECTION

References: 800-53|AC-3, 800-53|AC-5, 800-53|AC-6, 800-53|CM-7(2), 800-53|MP-2, CSCv7|14.6

Plugin: Unix

Control ID: d8735ef6470d3d51cf4aab25003ca100dae6250ece8fa3bf38c0fa74747ceb6a