# Cis Ubuntu1804 V220 2 2 2

> Ensure Avahi Server is not installed

- Skill: `cyberstrikeus/cis-ubuntu1804-v220-2-2-2` (Agent Skill)
- Install (CLI): `npx skillmds@latest add cyberstrikeus/cis-ubuntu1804-v220-2-2-2`
- Raw SKILL.md: https://api.skillmd.com/api/skills/cyberstrikeus/cis-ubuntu1804-v220-2-2-2/raw
- Safety review: PASS (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-ubuntu1804-v220-2-2-2

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# 2.2.2 Ensure Avahi Server is not installed (Automated)

## Profile

- Level 1 - Server
- Level 1 - Workstation

## Description

Avahi is a free zeroconf implementation, including a system for multicast DNS/DNS-SD service discovery. Avahi allows programs to publish and discover services and hosts running on a local network with no specific configuration. For example, a user can plug a computer into a network and Avahi automatically finds printers to print to, files to look at and people to talk to, as well as network services running on the machine.

## Rationale

Automatic discovery of network services is not normally required for system functionality. It is recommended to remove this package to reduce the potential attack surface.

## Audit Procedure

### Command Line

Run the following command to verify `avahi-daemon` is not installed:

```bash
# dpkg-query -s avahi-daemon &>/dev/null && echo "avahi-daemon is installed"
```

Nothing should be returned.

## Expected Result

No output (empty result).

## Remediation

### Command Line

Run the following commands to remove `avahi-daemon`:

```bash
# systemctl stop avahi-daemon.service
# systemctl stop avahi-daemon.socket
# apt purge avahi-daemon
```

## References

1. NIST SP 800-53 Rev. 5: SI-4

## 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