TMA-ROS1-1.1.9
Ensure nosuid option set on /var/tmp partition
MediumLevel 1Automatedros
Description
The nosuid mount option specifies that the filesystem cannot contain setuid files. The audit requires the nosuid mount option on /var/tmp when it is a separate mount (findmnt); not applicable otherwise. Host-level control from the CIS ROS Melodic benchmark (Ubuntu 18.04 robot hosts); run as root.
How it is checked
Audit method: Shell command
shell
if ! findmnt -kn /var/tmp >/dev/null 2>&1; then echo compliant; elif findmnt -kn -o OPTIONS /var/tmp | tr ',' '\n' | grep -qx -- nosuid; then echo compliant; else echo '/var/tmp is mounted without nosuid'; fi- Expected output
compliant
How it is fixed
Fix method: Guidance or infrastructure patch
Edit the /etc/fstab file and add nosuid to the fourth field (mounting options) for the /var/tmp partition. See the fstab(5) manual page for more information. Run the following command to remount /var/tmp : # mount -o remount,nosuid /var/tmp
Properties
- Operating systems
- Any
- Tags
- rosros1melodicsystem
- Reference
- CIS ROS Melodic Benchmark v1.0.0 - 1.1.9 Ensure nosuid option set on /var/tmp partition
Check this host
Run this on a machine you are allowed to audit. The scan is read-only.
shell
tmaegis scan --target ros