cis-ubuntu1604-v200-2-2-5

name	cis-ubuntu1604-v200-2-2-5
description	Ensure LDAP client is not installed
category	cis-networking
version	2.0.0
author	cyberstrike-official
tags	["cis","ubuntu","linux","ubuntu-16.04","services"]
cis_id	2.2.5
cis_benchmark	CIS Ubuntu Linux 16.04 LTS Benchmark v2.0.0
tech_stack	["ubuntu","linux"]
cwe_ids	[]
chains_with	[]
prerequisites	[]
severity_boost	{}

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:

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:

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