# Cis Ubuntu1204 V110 2 13

> Add nosuid Option to Removable Media Partitions

- Skill: `cyberstrikeus/cis-ubuntu1204-v110-2-13` (Agent Skill)
- Install (CLI): `npx skillmds@latest add cyberstrikeus/cis-ubuntu1204-v110-2-13`
- Raw SKILL.md: https://api.skillmd.com/api/skills/cyberstrikeus/cis-ubuntu1204-v110-2-13/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-v110-2-13

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# 2.13 Add nosuid Option to Removable Media Partitions (Not Scored)

## Profile Applicability

- Level 1

## Description

Set `nosuid` on removable media to prevent `setuid` and `setgid` executable files that are on that media from being executed as `setuid` and `setgid`.

## Rationale

Setting this option on a file system prevents users from introducing privileged programs onto the system and allowing non-root users to execute them.

## Audit Procedure

### Using Command Line

```bash
grep <each removable media mountpoint> /etc/fstab
```

Verify that `nosuid` is an option.

## Expected Result

The `nosuid` option should be present in the mount options for each removable media mountpoint.

## Remediation

### Using Command Line

Edit the `/etc/fstab` file and add `nosuid` to the fourth field (mounting options). Look for entries that have mount points that contain words such as floppy or cdrom. See the `fstab(5)` manual page for more information.

## Default Value

By default, the `nosuid` option is not set on removable media partitions.

## References

- CIS Ubuntu 12.04 LTS Server Benchmark v1.1.0

## Profile

Level 1 - Not Scored