# Cis Docker 2.5

> Cis Docker 2.5 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 insecure registries are not used

- Skill name: `cis-docker-2.5`
- 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-2.5/SKILL.md
- Repository: CyberStrikeus/CyberStrike (1,211 GitHub stars when collected)

## SKILL.md

# Ensure insecure registries are not used (Manual)

## Profile Applicability

• Level 1 - Docker - Linux

## Description

Docker considers a private registry either secure or insecure. By default, registries are considered secure.

## Rationale

A secure registry uses TLS. A copy of registry's CA certificate is placed on the Docker host at `/etc/docker/certs.d/<registry-name>/` directory. An insecure registry is one which does not have a valid registry certificate, or one not using TLS. Insecure registries should not be used as they present a risk of traffic interception and modification.

Additionally, once a registry has been marked as insecure commands such as `docker pull`, `docker push`, and `docker search` will not result in an error message and users may indefinitely be working with this type of insecure registry without ever being notified of the risk of potential compromise.

## Impact

None.

## Audit Procedure

You should execute the command below to find out if any insecure registries are in use:

```bash
docker info --format 'Insecure Registries:'
```

## Remediation

You should ensure that no insecure registries are in use.

## Default Value

By default, Docker assumes all, but local, registries are secure.

## Additional Information

Docker engine always include 127.0.0.0/8 and ::1/128 as insecure registers

## References

None listed in the benchmark.

## CIS Controls

**Controls Version:** v8

**Control:** 2.5 Allowlist Authorized Software

Use technical controls, such as application allowlisting, to ensure that only authorized software can execute or be accessed. Reassess bi-annually, or more frequently.

**IG 1:**
**IG 2:** ●
**IG 3:** ●

---

**Controls Version:** v7

**Control:** 14.4 Encrypt All Sensitive Information in Transit

Encrypt all sensitive information in transit.

**IG 1:**
**IG 2:** ●
**IG 3:** ●

---

Source: https://www.openparable.com/skill/devops-security/cis-docker-2-5 (OpenParable). Cite the canonical URL above.