# Cis Ubuntu1804 V220 6 2 2

> Ensure /etc/shadow password fields are not empty

- Skill: `cyberstrikeus/cis-ubuntu1804-v220-6-2-2` (Agent Skill)
- Install (CLI): `npx skillmds@latest add cyberstrikeus/cis-ubuntu1804-v220-6-2-2`
- Raw SKILL.md: https://api.skillmd.com/api/skills/cyberstrikeus/cis-ubuntu1804-v220-6-2-2/raw
- Safety review: PASS (external: skill-scanner PASS, skillspector CAUTION)
- 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-v220-6-2-2

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# 6.2.2 Ensure /etc/shadow password fields are not empty (Automated)

## Profile

- Level 1 - Server
- Level 1 - Workstation

## Description

An account with an empty password field means that anybody may log in as that user without providing a password.

## Rationale

All accounts must have passwords or be locked to prevent the account from being used by an unauthorized user.

## Audit Procedure

### Command Line

Run the following command and verify that no output is returned:

```bash
# awk -F: '($2 == "" ) { print $1 " does not have a password"}' /etc/shadow
```

## Expected Result

No output should be returned.

## Remediation

### Command Line

If any accounts in the `/etc/shadow` file do not have a password, run the following command to lock the account until it can be determined why it does not have a password:

```bash
# passwd -l <username>
```

Also, check to see if the account is logged in and investigate what it is being used for to determine if it needs to be forced off.

## References

1. NIST SP 800-53 Rev. 5: IA-5

## CIS Controls

- v8: **5.2** Use Unique Passwords
- v7: **4.4** Use Unique Passwords