# Cis Ubuntu1204 V110 9 3 10

> Do Not Allow Users to Set Environment Options

- Skill: `cyberstrikeus/cis-ubuntu1204-v110-9-3-10` (Agent Skill)
- Install (CLI): `npx skillmds@latest add cyberstrikeus/cis-ubuntu1204-v110-9-3-10`
- Raw SKILL.md: https://api.skillmd.com/api/skills/cyberstrikeus/cis-ubuntu1204-v110-9-3-10/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-ubuntu1204-v110-9-3-10

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# 9.3.10 Do Not Allow Users to Set Environment Options (Scored)

## Profile Applicability

- Level 1

## Description

The `PermitUserEnvironment` option allows users to present environment options to the `ssh` daemon.

## Rationale

Permitting users the ability to set environment variables through the SSH daemon could potentially allow users to bypass security controls (e.g. setting an execution path that has `ssh` executing trojan'd programs).

## Audit Procedure

### Using Command Line

To verify the correct SSH setting, run the following command and verify that the output is as shown:

```bash
grep PermitUserEnvironment /etc/ssh/sshd_config
```

## Expected Result

```
PermitUserEnvironment no
```

## Remediation

### Using Command Line

Edit the `/etc/ssh/sshd_config` file to set the parameter as follows:

```bash
PermitUserEnvironment no
```

## Default Value

PermitUserEnvironment no

## References

- CIS Ubuntu 12.04 LTS Server Benchmark v1.1.0

## Profile

Level 1 - Scored