cis-docker-v160-1-1-2

name	cis-docker-v160-1.1.2
description	Ensure only trusted users are allowed to control Docker daemon
category	cis-docker
version	1.6.0
author	cyberstrike-official
tags	["cis","docker","host-configuration","access-control","docker-group","linux"]
cis_id	1.1.2
cis_benchmark	CIS Docker Benchmark v1.6.0
tech_stack	["docker","linux"]
cwe_ids	[]
chains_with	[]
prerequisites	[]
severity_boost	{}

CIS Docker Benchmark v1.6.0 - 1.1.2

Profile Applicability

• Level 1 - Docker - Linux

Description

The Docker daemon currently requires root access to the Docker socket which is, by default, owned by the user root and the group docker.

Rationale

Docker allows you to share a directory between the Docker host and a guest container without limiting the access rights of the container. This means that you can start a container and map the / directory on your host to the container. The container would then be able to modify your host file system without any restrictions. This means that you could gain elevated privileges simply by being a member of the docker group and subsequently start a container which maps the root / directory on the host.

Impact

Provided the proceeding instructions are implemented, rights to build and execute containers as normal user would be restricted.

Audit Procedure

Execute the following command on the docker host and ensure that only trusted users are members of the docker group.

getent group docker

Remediation

You should remove any untrusted users from the docker group. Additionally, you should not create a mapping of sensitive directories from the host to container volumes.

Default Value

Not Applicable

References

1. https://docs.docker.com/engine/security/#docker-daemon-attack-surface
2. http://www.projectatomic.io/blog/2015/08/why-we-dont-let-non-root-users-run-docker-in-centos-fedora-or-rhel/

CIS Controls

Controls Version	Control	IG 1	IG 2	IG 3
v8	6.1 Establish an Access Granting Process Establish and follow a process, preferably automated, for granting access to enterprise assets upon new hire, rights grant, or role change of a user.	●	●	●
v7	4 Controlled Use of Administrative Privileges Controlled Use of Administrative Privileges