# Cis Ubuntu1804 V220 2 3 5

> Ensure LDAP client is not installed

- Skill: `cyberstrikeus/cis-ubuntu1804-v220-2-3-5` (Agent Skill)
- Install (CLI): `npx skillmds@latest add cyberstrikeus/cis-ubuntu1804-v220-2-3-5`
- Raw SKILL.md: https://api.skillmd.com/api/skills/cyberstrikeus/cis-ubuntu1804-v220-2-3-5/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-v220-2-3-5

---


# 2.3.5 Ensure LDAP client is not installed (Automated)

## Profile

- Level 1 - Server
- Level 1 - Workstation

## Description

The Lightweight Directory Access Protocol (LDAP) was introduced as a replacement for NIS/YP. It is a service that provides a method for looking up information from a central database.

## Rationale

If the system will not need to act as an LDAP client, it is recommended that the software be removed to reduce the potential attack surface.

## Impact

Removing the LDAP client will prevent or inhibit using LDAP for authentication in your environment.

## Audit Procedure

### Command Line

Verify that `ldap-utils` is not installed. Use the following command to provide the needed information:

```bash
# dpkg-query -s ldap-utils &>/dev/null && echo "ldap-utils is installed"
```

Nothing should be returned.

## Expected Result

No output (empty result).

## Remediation

### Command Line

Uninstall `ldap-utils`:

```bash
# apt purge ldap-utils
```

## References

1. 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