CIS Ubuntu 14.04 LTS - 2.2.2 Ensure X Window System is not installed

DevOps & Security

Verify that X Window System packages are not installed on servers

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How to use this skill

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Prompt to paste

I want to install this Agent Skill for this project in Codex.

Source SKILL.md: https://github.com/CyberStrikeus/CyberStrike/blob/HEAD/.cyberstrike/skill/CIS_benchmarks/Operating_Systems/Ubuntu/CIS_Ubuntu_Linux_14.04_LTS_Benchmark_v2.1.0/cis-ubuntu1404-v210-2-2-2/SKILL.md

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First, summarize what it does, its dependencies, license status if identifiable, and any risks. Show the exact files you propose to add under .agents/skills/cis-ubuntu-14-04-lts-2-2-2-ensure-x-window-system-is-not-installed/. Do not write files or run scripts until I approve.

After I approve, install the complete skill folder, including required referenced files, into that project location. Verify it is discoverable, then tell me its actual invocation name and how to use it. Do not claim it is installed until you have verified it.

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

2.2.2 Ensure X Window System is not installed (Scored)

Profile Applicability

Level 1 - Server

Description

The X Window System provides a Graphical User Interface (GUI) where users can have multiple windows in which to run programs and various add on. The X Windows system is typically used on workstations where users login, but not on servers where users typically do not login.

Rationale

Unless your organization specifically requires graphical login access via X Windows, remove it to reduce the potential attack surface.

Audit Procedure

Run the following command and verify X Windows System is not installed:

dpkg -l xserver-xorg*

Expected Result

No xserver-xorg packages should be installed.

Remediation

Run the following command to remove the X Windows System packages:

apt-get remove xserver-xorg*

Default Value

X Window System may be installed on workstation installations.

References

CIS Controls: 2 Inventory of Authorized and Unauthorized Software

Profile

Level 1 - Server