# Cis Ubuntu1204 V110 13 5

> Verify No UID 0 Accounts Exist Other Than root

- Skill: `cyberstrikeus/cis-ubuntu1204-v110-13-5` (Agent Skill)
- Install (CLI): `npx skillmds@latest add cyberstrikeus/cis-ubuntu1204-v110-13-5`
- Raw SKILL.md: https://api.skillmd.com/api/skills/cyberstrikeus/cis-ubuntu1204-v110-13-5/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-ubuntu1204-v110-13-5

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# 13.5 Verify No UID 0 Accounts Exist Other Than root (Scored)

## Profile Applicability

- Level 1

## Description

Any account with UID 0 has superuser privileges on the system.

## Rationale

This access must be limited to only the default `root` account and only from the system console. Administrative access must be through an unprivileged account using an approved mechanism as noted in Item 9.4 Restrict root Login to System Console.

## Audit Procedure

### Using Command Line

Run the following command and verify that only the word "root" is returned:

```bash
/bin/cat /etc/passwd | /usr/bin/awk -F: '($3 == 0) { print $1 }' root
```

## Expected Result

Only `root` should be returned. Any other accounts with UID 0 represent a security risk.

## Remediation

### Using Command Line

Delete any other entries that are displayed besides `root`.

## Default Value

Only the `root` account has UID 0 by default.

## References

- CIS Ubuntu 12.04 LTS Server Benchmark v1.1.0

## Profile

Level 1 - Scored