cis-ubuntu2004-v300-2-2-5

DevOps & Security

Ensure ldap client is not installed

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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_20.04_LTS_Benchmark_v3.0.0/cis-ubuntu2004-v300-2-2-5/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-ubuntu2004-v300-2-2-5/. 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

Ensure ldap client is not installed

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

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

Command Line

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

Expected Result

Nothing should be returned.

Remediation

Uninstall ldap-utils:

Command Line

# apt purge ldap-utils

References

NIST SP 800-53 Rev. 5: CM-7

CIS Controls

Controls Version	Control	IG 1	IG 2	IG 3
v8	4.8 Uninstall or Disable Unnecessary Services on Enterprise Assets and SoftwareUninstall or disable unnecessary services on enterprise assets and software, such as an unused file sharing service, web application module, or service function.		●	●
v7	9.2 Ensure Only Approved Ports, Protocols and Services Are RunningEnsure that only network ports, protocols, and services listening on a system with validated business needs, are running on each system.		●	●

MITRE ATT&CK Mappings

Techniques / Sub-techniques	Tactics	Mitigations
T1203, T1203.000, T1543, T1543.002	TA0006, TA0008	M1041, M1042