# Cis Ubuntu1804 V220 2 2 4

> Ensure DHCP Server is not installed

- Skill: `cyberstrikeus/cis-ubuntu1804-v220-2-2-4` (Agent Skill)
- Install (CLI): `npx skillmds@latest add cyberstrikeus/cis-ubuntu1804-v220-2-2-4`
- Raw SKILL.md: https://api.skillmd.com/api/skills/cyberstrikeus/cis-ubuntu1804-v220-2-2-4/raw
- Safety review: PASS (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: cyberstrikeus (https://skillmd.com/u/cyberstrikeus)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/cyberstrikeus/cis-ubuntu1804-v220-2-2-4

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# 2.2.4 Ensure DHCP Server is not installed (Automated)

## Profile

- Level 1 - Server
- Level 1 - Workstation

## Description

The Dynamic Host Configuration Protocol (DHCP) is a service that allows machines to be dynamically assigned IP addresses.

## Rationale

Unless a system is specifically set up to act as a DHCP server, it is recommended that this package be removed to reduce the potential attack surface.

## Audit Procedure

### Command Line

Run the following commands to verify `isc-dhcp-server` is not installed:

```bash
# dpkg-query -s isc-dhcp-server &>/dev/null && echo "isc-dhcp-server is installed"
```

Nothing should be returned.

## Expected Result

No output (empty result).

## Remediation

### Command Line

Run the following command to remove `isc-dhcp-server`:

```bash
# apt purge isc-dhcp-server
```

## References

1. More detailed documentation on DHCP is available at http://www.isc.org/software/dhcp.
2. NIST SP 800-53 Rev. 5: CM-7

## CIS Controls

- v8: 4.8 - Uninstall or Disable Unnecessary Services on Enterprise Assets and Software
- v7: 9.2 - Ensure Only Approved Ports, Protocols and Services Are Running