Cis Ubuntu1804 V220 2 2 12

---
name: cis-ubuntu1804-v220-2-2-12
description: "Ensure HTTP Proxy Server is not installed"
category: cis-networking
version: "2.2.0"
author: cyberstrike-official
tags: [cis, ubuntu, linux, ubuntu-18.04, services, http-proxy]
cis_id: "2.2.12"
cis_benchmark: "CIS Ubuntu Linux 18.04 LTS Benchmark v2.2.0"
tech_stack: [ubuntu, linux]
cwe_ids: []
chains_with: []
prerequisites: []
severity_boost: {}
---

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

## Profile

- Level 1 - Server
- Level 1 - Workstation

## 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-query -s squid &>/dev/null && echo "squid is installed"
```

Nothing should be returned.

## Expected Result

No output (empty result).

## Remediation

### Command Line

Run the following command to remove `squid`:

```bash
# apt purge squid
```

## References

1. NIST SP 800-53 Rev. 5: CM-6, CM-7

Additional Information:

Several HTTP proxy servers exist. These and other services should be checked.

## 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