Cis Docker V170 5.10
DevOps & Securitycis-docker-v170-5.10Cis Docker V170 5.10 is an Agent Skill for devops & security published in the CyberStrikeus/CyberStrike repository on GitHub: a SKILL.md instruction file an AI agent can load to do this task.
Ensure that the host's network namespace is not shared
How to use this skill
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- Open your project in Codex.
- Copy and paste the prompt below.
- Review files and risks before approving any action.
Inspect the Agent Skill at https://github.com/CyberStrikeus/CyberStrike/blob/HEAD/.cyberstrike/skill/CIS_benchmarks/Server_Software/Docker/CIS_Docker_Benchmark_v1.7.0/cis-docker-v170-5.10/SKILL.md and all supporting files. Report provenance, permissions, scripts, dependencies, and security risks. Propose an exact installation into .agents/skills/cis-docker-v170-5-10, but wait for my approval before writing files or running scripts.
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CIS Docker Benchmark v1.7.0 - Control 5.10
Profile Applicability
- Level 1 - Docker - Linux
Description
When the networking mode on a container is set to --net=host, the container is not placed inside a separate network stack. Effectively, applying this option instructs Docker to not containerize the container's networking. The consequence of this is that the container lives "outside" in the main Docker host and has full access to its network interfaces.
Rationale
Selecting this option is potentially dangerous. It allows the container process to open reserved low numbered ports in the way that any other root process can. It also allows the container to access network services such as D-bus on the Docker host. A container process could potentially carry out undesired actions, such as shutting down the Docker host. This option should not be used unless there is a very specific reason for enabling it.
Impact
None.
Audit Procedure
You should use the command below:
docker ps --quiet --all | xargs docker inspect --format='{{ .Id }}: NetworkMode={{ .HostConfig.NetworkMode }}'
If this returns NetworkMode=host, it means that the --net=host option was passed when the container was started.
Remediation
You should not pass the --net=host option when starting any container.
Default Value
By default, containers connect to the Docker bridge when starting and do not run in the context of the host's network stack.
References
CIS Controls
v8:
- 12.2 Establish and Maintain a Secure Network Architecture - Establish and maintain a secure network architecture. A secure network architecture must address segmentation, least privilege, and availability, at a minimum.
v7:
- 12 Boundary Defense - Boundary Defense
Assessment Status
Manual