# Cis Docker 3.13

> Cis Docker 3.13 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 Docker server certificate key file ownership is set to root:root

- Skill name: `cis-docker-3.13`
- Category: [DevOps & Security](https://www.openparable.com/skill/devops-security/1)
- Source: https://github.com/CyberStrikeus/CyberStrike/blob/HEAD/.cyberstrike/skill/CIS_benchmarks/Server_Software/Docker/CIS_Docker_Benchmark_v1.8.0/cis-docker-3.13/SKILL.md
- Repository: CyberStrikeus/CyberStrike (1,211 GitHub stars when collected)

## SKILL.md

# Ensure that the Docker server certificate key file ownership is set to root:root (Manual)

## Profile Applicability

- Level 1 - Docker - Linux

## Description

You should verify that the Docker server certificate key file (the file that is passed along with the `--tlskey` parameter) is individually owned and group owned by `root`.

## Rationale

The Docker server certificate key file should be protected from any tampering or unneeded reads/writes. As it holds the private key for the Docker server certificate, it must be individually owned and group owned by `root` to ensure that it cannot be accessed by less privileged users.

## Impact

None.

## Audit Procedure

You should execute the command below to verify that the Docker server certificate key file is individually owned and group owned by `root`:

```bash
stat -c %U:%G <path to Docker server certificate key file> | grep -v root:root
```

The command above should return no results.

## Remediation

You should execute the following command:

```bash
chown root:root <path to Docker server certificate key file>
```

This sets the individual ownership and group ownership for the Docker server certificate key file to `root`.

## Default Value

By default, the individual ownership and group ownership for the Docker server certificate key file is correctly set to `root`.

## References

1. https://docs.docker.com/registry/insecure/
2. https://docs.docker.com/engine/security/https/

## CIS Controls

| Controls Version | Control                                                                                                                                                                                                                                                                                                                      | IG 1 | IG 2 | IG 3 |
| ---------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---- | ---- | ---- |
| v8               | 5.4 Restrict Administrator Privileges to Dedicated Administrator Accounts - Restrict administrator privileges to dedicated administrator accounts on enterprise assets. Conduct general computing activities, such as internet browsing, email, and productivity suite use, from the user's primary, non-privileged account. | ●    | ●    | ●    |
| v7               | 4 Controlled Use of Administrative Privileges - Controlled Use of Administrative Privileges                                                                                                                                                                                                                                  |      |      |      |

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Source: https://www.openparable.com/skill/devops-security/cis-docker-3-13 (OpenParable). Cite the canonical URL above.