# Cis Ubuntu1604 V200 2 1 3

> Ensure Avahi Server is not installed

- Skill: `cyberstrikeus/cis-ubuntu1604-v200-2-1-3` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add cyberstrikeus/cis-ubuntu1604-v200-2-1-3`
- Raw SKILL.md: https://api.skillmd.com/api/skills/cyberstrikeus/cis-ubuntu1604-v200-2-1-3/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-v200-2-1-3

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# 2.1.3 Ensure Avahi Server is not installed (Automated)

## 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 -s avahi-daemon | grep -E '(Status:|not installed)'
```

## Expected Result

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

## Remediation

### Command Line

Run the following commands to remove avahi-daemon:

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

## Default Value

avahi-daemon is not installed on minimal server installations.

## References

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

## Profile

- Level 1 - Server
- Level 1 - Workstation