# Cis Ubuntu1604 V200 2 2 5

> Ensure LDAP client is not installed

- Skill: `cyberstrikeus/cis-ubuntu1604-v200-2-2-5` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add cyberstrikeus/cis-ubuntu1604-v200-2-2-5`
- Raw SKILL.md: https://api.skillmd.com/api/skills/cyberstrikeus/cis-ubuntu1604-v200-2-2-5/raw
- Safety review: pending (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-ubuntu1604-v200-2-2-5

---


# 2.2.5 Ensure LDAP client is not installed (Automated)

## 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 -s ldap-utils | grep -E '(Status:|not installed)'
```

## Expected Result

```
dpkg-query: package 'ldap-utils' is not installed and no information is available
```

## Remediation

### Command Line

Uninstall ldap-utils:

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

## Default Value

ldap-utils is not installed on minimal server installations.

## References

1. CIS Controls v7 - 2.6 Address unapproved software

## Profile

- Level 1 - Server
- Level 1 - Workstation