# Cis Ubuntu1204 V110 3 1

> Set User/Group Owner on bootloader config

- Skill: `cyberstrikeus/cis-ubuntu1204-v110-3-1` (Agent Skill)
- Install (CLI): `npx skillmds@latest add cyberstrikeus/cis-ubuntu1204-v110-3-1`
- Raw SKILL.md: https://api.skillmd.com/api/skills/cyberstrikeus/cis-ubuntu1204-v110-3-1/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-v110-3-1

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# 3.1 Set User/Group Owner on bootloader config (Scored)

## Profile Applicability

- Level 1

## Description

Set the owner and group of your boot loaders config file to the root user. These instructions default to GRUB stored at `/boot/grub/grub.cfg`.

## Rationale

Setting the owner and group to root prevents non-root users from changing the file.

## Audit Procedure

### Using Command Line

Perform the following to determine if the `/boot/grub/grub.cfg` file has the correct ownership:

```bash
stat -c "%u %g" /boot/grub/grub.cfg | egrep "^0 0"
```

## Expected Result

The command should return `0 0` indicating root:root ownership. If the above command emits no output then the system is not configured as recommended.

## Remediation

### Using Command Line

Run the following to change ownership of `/boot/grub/grub.cfg`:

```bash
chown root:root /boot/grub/grub.cfg
```

## Default Value

By default, `/boot/grub/grub.cfg` is owned by root:root.

## References

- CIS Ubuntu 12.04 LTS Server Benchmark v1.1.0

## Profile

Level 1 - Scored