TMA-DOCKER-3.3

Ensure that docker.socket file ownership is set to root:root

HighLevel 1Automateddocker

Description

The docker.socket unit file must be owned by root:root so that unprivileged users cannot alter Docker behaviour. The audit stats every existing candidate path (/usr/lib/systemd/system/docker.socket, /lib/systemd/system/docker.socket, /etc/systemd/system/docker.socket); not applicable when none exists.

How it is checked

Audit method: Shell command

shell

for f in /usr/lib/systemd/system/docker.socket /lib/systemd/system/docker.socket /etc/systemd/system/docker.socket; do [ -e "$f" ] || continue; o=$(stat -Lc '%U:%G' "$f") || exit 1; [ "$o" = root:root ] || { echo "$f $o"; exit 0; }; done; echo compliant

Expected output: compliant

How it is fixed

Fix method: Shell command

shell

for f in /usr/lib/systemd/system/docker.socket /lib/systemd/system/docker.socket /etc/systemd/system/docker.socket; do if [ -e "$f" ]; then chown root:root "$f" || exit 1; fi; done

Properties

Operating systems: Any
Tags: dockerpermissions
Reference: CIS Docker Benchmark v1.9.0 - 3.3 Ensure that docker.socket file ownership is set to root:root

Check this host

Run this on a machine you are allowed to audit. The scan is read-only.

shell

tmaegis scan --target docker