TMA-COS-1.1.4
Ensure nosuid option set on /tmp partition
MediumLevel 1Automatedcos
Description
The nosuid mount option specifies that the filesystem cannot contain setuid files. Since the /tmp filesystem is only intended for temporary file storage, set this option to ensure that users cannot create setuid files in /tmp .
How it is checked
Audit method: Shell command
shell
if ! findmnt -kn /tmp >/dev/null 2>&1; then echo compliant; elif findmnt -kn /tmp | grep -qw -- nosuid; then echo compliant; else echo /tmp' is mounted without nosuid'; fi- Expected output
compliant
How it is fixed
Fix method: Guidance or infrastructure patch
Run the following command to remount /tmp : # mount -o remount,nosuid /tmp /etc is stateless on Container-Optimized OS. Therefore, /etc cannot be used to make these changes persistent across reboots. The steps mentioned above needs to be performed after every boot.
Properties
- Operating systems
- Any
- Tags
- container-optimized-oscos
- Reference
- CIS Google Container-Optimized OS Benchmark v1.2.0 - 1.1.4 Ensure nosuid option set on /tmp partition
Check this host
Run this on a machine you are allowed to audit. The scan is read-only.
shell
tmaegis scan --target cos