# Cis Ubuntu1604 V200 2 1 13

> Ensure HTTP Proxy Server is not installed

- Skill: `cyberstrikeus/cis-ubuntu1604-v200-2-1-13` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add cyberstrikeus/cis-ubuntu1604-v200-2-1-13`
- Raw SKILL.md: https://api.skillmd.com/api/skills/cyberstrikeus/cis-ubuntu1604-v200-2-1-13/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-v200-2-1-13

---


# 2.1.13 Ensure HTTP Proxy Server is not installed (Automated)

## Description

Squid is a standard proxy server used in many distributions and environments.

## Rationale

If there is no need for a proxy server, it is recommended that the squid proxy be deleted to reduce the potential attack surface.

## Audit Procedure

### Command Line

Run the following command to verify squid is not installed:

```bash
dpkg -s squid | grep -E '(Status:|not installed)'
```

## Expected Result

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

## Remediation

### Command Line

Run the following command to remove squid:

```bash
apt purge squid
```

## Default Value

squid is not installed on minimal server installations. Several HTTP proxy servers exist. These and other services should be checked.

## References

1. CIS Controls v7 - 9.2 Ensure Only Approved Ports, Protocols and Services Are Running

## Profile

- Level 1 - Server
- Level 1 - Workstation