# Cis Ubuntu1804 V220 4 3 5

> Ensure re-authentication for privilege escalation is not disabled globally

- Skill: `cyberstrikeus/cis-ubuntu1804-v220-4-3-5` (Agent Skill)
- Install (CLI): `npx skillmds@latest add cyberstrikeus/cis-ubuntu1804-v220-4-3-5`
- Raw SKILL.md: https://api.skillmd.com/api/skills/cyberstrikeus/cis-ubuntu1804-v220-4-3-5/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-ubuntu1804-v220-4-3-5

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# CIS Ubuntu Linux 18.04 LTS Benchmark v2.2.0 - Control 4.3.5

## Profile Applicability

- Level 1 - Server
- Level 1 - Workstation

## Description

The operating system must be configured so that the `!authenticate` option is not used in `/etc/sudoers` or in any included sudoers file.

## Rationale

Without re-authentication, users may access resources or perform tasks for which they do not have authorization. When operating systems provide the capability to escalate a functional capability, it is critical the user re-authenticate.

## Audit Procedure

### Command Line

Run the following command to verify that `!authenticate` is not configured:

```bash
grep -r "!authenticate" /etc/sudoers /etc/sudoers.d/
```

### Expected Result

Nothing should be returned. If output is returned, it means re-authentication has been disabled.

## Remediation

### Command Line

Remove any occurrences of `!authenticate` found in `/etc/sudoers` or files in `/etc/sudoers.d/`.

Use `visudo` to edit the files:

```bash
visudo
visudo -f /etc/sudoers.d/<filename>
```

## References

1. NIST SP 800-53 Rev. 5: IA-11

## CIS Controls

v8 - 5.4 Restrict Administrator Privileges to Dedicated Administrator Accounts.

v7 - 4.3 Ensure the Use of Dedicated Administrative Accounts.

## Profile Applicability

- Level 1 - Server
- Level 1 - Workstation

## Assessment Status

Automated