Ensure that the Docker socket file ownership is set to root:docker

CriticalLevel 1Automateddocker

Description

The Docker socket (anyone who can write it controls the daemon) must be owned by root:docker. The audit stats every existing candidate path (/var/run/docker.sock, /run/docker.sock); not applicable when none exists.

How it is checked

Audit method: Shell command

shell

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

Expected output: compliant

How it is fixed

Fix method: Shell command

shell

for f in /var/run/docker.sock /run/docker.sock; do if [ -e "$f" ]; then chown root:docker "$f" || exit 1; fi; done

Properties

Operating systems: Any
Tags: dockerpermissions
Reference: CIS Docker Benchmark v1.9.0 - 3.15 Ensure that the Docker socket file ownership is set to root:docker

Check this host

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

shell

tmaegis scan --target docker