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The Docker socket must not be mounted inside any containers.

An XCCDF Rule

Description

The Docker socket docker.sock must not be mounted inside a container, with the exception case being during the installation of Universal Control Plane (UCP) component of Docker Enterprise as it is required for install. If the Docker socket is mounted inside a container, it would allow processes running within the container to execute docker commands which effectively allows for full control of the host. By default, docker.sock (Linux) and \\.\pipe\docker_engine (Windows) is not mounted inside containers.

ID
SV-260922r966123_rule
Version
CNTR-MK-000550
Severity
Medium
References
Updated

Remediation Templates

A Manual Procedure

If using Kubernetes orchestration, this check is Not Applicable.

When using Swarm orchestration and using the -v/--volume flags to mount volumes to containers in a docker run command, do not use docker.sock as a volume.

A reference for the docker run command can be found at https://docs.docker.com/engine/reference/run/.