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Cis Docker 4.10

DevOps & Security
cis-docker-4.10

Cis Docker 4.10 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 secrets are not stored in Dockerfiles

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How to use this skill

Bring this guide into your coding agent with a prompt tailored to the tool you use.

  1. Open your project in Codex.
  2. Copy and paste the prompt below.
  3. Review files and risks before approving any action.
Prompt to paste
Inspect the Agent Skill at https://github.com/CyberStrikeus/CyberStrike/blob/HEAD/.cyberstrike/skill/CIS_benchmarks/Server_Software/Docker/CIS_Docker_Benchmark_v1.8.0/cis-docker-4.10/SKILL.md and all supporting files. Report provenance, permissions, scripts, dependencies, and security risks. Propose an exact installation into .agents/skills/cis-docker-4-10, but wait for my approval before writing files or running scripts.

Copying this prompt does not install or run the skill. Review third-party files before use.

4.10 Ensure secrets are not stored in Dockerfiles (Manual)

Profile Applicability

  • Level 1 - Docker - Linux

Description

Do not store any secrets in Dockerfiles.

Rationale

Docker images are not opaque and contain information about the commands used to build them. As such secrets should not be included in Dockerfiles used to build images as they will be visible to any users of the image.

Impact

A proper secrets management process will be required for Docker image building.

Audit Procedure

Run the below command to get the list of images:

docker images

Run the below command for each image in the list above, and look for any secrets:

docker history <IMAGE_ID>

Alternatively, if you have access to Dockerfile for the image, verify that there are no secrets as described above.

Remediation

Do not store any kind of secrets within Dockerfiles. Where secrets are required during the build process, make use of a secrets management tool, such as the buildkit builder included with Docker.

Default Value

By default, there are no restrictions on storing config secrets in the Dockerfiles.

References

  1. https://docs.docker.com/develop/develop-images/build_enhancements/#new-docker-build-secret-information

CIS Controls

v8

3 Data Protection

Develop processes and technical controls to identify, classify, securely handle, retain, and dispose of data.

v7

13 Data Protection

Data Protection