# Cis Ubuntu1204 V110 9 1 2

> Set User/Group Owner and Permission on /etc/crontab

- Skill: `cyberstrikeus/cis-ubuntu1204-v110-9-1-2` (Agent Skill)
- Install (CLI): `npx skillmds@latest add cyberstrikeus/cis-ubuntu1204-v110-9-1-2`
- Raw SKILL.md: https://api.skillmd.com/api/skills/cyberstrikeus/cis-ubuntu1204-v110-9-1-2/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-ubuntu1204-v110-9-1-2

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# 9.1.2 Set User/Group Owner and Permission on /etc/crontab (Scored)

## Profile Applicability

- Level 1

## Description

The `/etc/crontab` file is used by `cron` to control its own jobs. The commands in this item make sure that root is the user and group owner of the file and that only the owner can access the file.

## Rationale

This file contains information on what system jobs are run by cron. Write access to these files could provide unprivileged users with the ability to elevate their privileges. Read access to these files could provide users with the ability to gain insight on system jobs that run on the system and could provide them a way to gain unauthorized privileged access.

## Audit Procedure

### Using Command Line

Perform the following to determine if the `/etc/crontab` file has the correct permissions:

```bash
stat -c "%a %u %g" /etc/crontab | egrep ".00 0 0"
```

## Expected Result

If the above command emits no output then the system is not configured as recommended. Expected output should match the pattern `.00 0 0` (owner root, group root, permissions restrictive).

## Remediation

### Using Command Line

```bash
chown root:root /etc/crontab
chmod og-rwx /etc/crontab
```

## Default Value

The default permissions on /etc/crontab may vary by installation.

## References

- CIS Ubuntu 12.04 LTS Server Benchmark v1.1.0

## Profile

Level 1 - Scored