How do I install the Cis Docker 4.3 skill?

Run npx skillmds@latest add cyberstrikeus/cis-docker-4-3 in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

What does the Cis Docker 4.3 skill do?

Ensure that unnecessary packages are not installed in the container It is listed under DevOps & Infra on SkillMD.

Is Cis Docker 4.3 safe to use?

SkillMD's automated safety review verdict for this skill is PASS. Independent scanners report: SkillSpector: PASS, Skill Scanner: PASS. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Cis Docker 4.3?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Cis Docker 4.3 free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Cis Docker 4.3?

cyberstrikeus (@cyberstrikeus) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Cis Docker 4.3 by cyberstrikeus — Agent Skill

Name: Cis Docker 4.3
Author: cyberstrikeus

File contents

4.3 Ensure that unnecessary packages are not installed in the container (Manual)

Profile Applicability

Level 1 - Docker - Linux

Description

Containers should have as small a footprint as possible, and should not contain unnecessary software packages which could increase their attack surface.

Rationale

Unnecessary software should not be installed into containers, as doing so increases their attack surface. Only packages strictly necessary for the correct operation of the application being deployed should be installed.

Impact

None.

Audit Procedure

List all the running instances of containers by executing the command below:

docker ps --quiet

For each container instance, execute the relevant command for listing all installed packages, e.g.:

docker exec $INSTANCE_ID rpm -qa

The command above lists the packages installed. You should review the list and ensure that everything installed is actually required.

Remediation

You should not install anything within the container that is not required.

You should consider using a minimal base image rather than the standard Centos, Debian, or Red Hat images if you can. Some of the options available include BusyBox and Alpine.

Not only can this trim your image size considerably, but there would also be fewer pieces of software which could contain vectors for attack.

Default Value

Not Applicable.

References

CIS Controls

v8

4.8 Uninstall or Disable Unnecessary Services on Enterprise Assets and Software

Uninstall or disable unnecessary services on enterprise assets and software, such as an unused file sharing service, web application module, or service function.

v7

5.2 Maintain Secure Images

Maintain secure images or templates for all systems in the enterprise based on the organization's approved configuration standards. Any new system deployment or existing system that becomes compromised should be imaged using one of those images or templates.

---name: cis-docker-4-3description: Ensure that unnecessary packages are not installed in the container---# 4.3 Ensure that unnecessary packages are not installed in the container (Manual)## Profile Applicability- Level 1 - Docker - Linux## DescriptionContainers should have as small a footprint as possible, and should not contain unnecessary software packages which could increase their attack surface.## RationaleUnnecessary software should not be installed into containers, as doing so increases their attack surface. Only packages strictly necessary for the correct operation of the application being deployed should be installed.## ImpactNone.## Audit ProcedureList all the running instances of containers by executing the command below:```bashdocker ps --quiet```For each container instance, execute the relevant command for listing all installed packages, e.g.:```bashdocker exec $INSTANCE_ID rpm -qa```The command above lists the packages installed. You should review the list and ensure that everything installed is actually required.## RemediationYou should not install anything within the container that is not required.You should consider using a minimal base image rather than the standard Centos, Debian, or Red Hat images if you can. Some of the options available include BusyBox and Alpine.Not only can this trim your image size considerably, but there would also be fewer pieces of software which could contain vectors for attack.## Default ValueNot Applicable.## References1. https://docs.docker.com/develop/develop-images/baseimages/2. https://jpetazzo.github.io/2020/02/01/quest-minimal-docker-images-part-1/## CIS Controls### v8**4.8 Uninstall or Disable Unnecessary Services on Enterprise Assets and Software**Uninstall or disable unnecessary services on enterprise assets and software, such as an unused file sharing service, web application module, or service function.### v7**5.2 Maintain Secure Images**Maintain secure images or templates for all systems in the enterprise based on the organization's approved configuration standards. Any new system deployment or existing system that becomes compromised should be imaged using one of those images or templates.

Frequently asked questions

Cis Docker 4.3