Cis Ubuntu1204 V110 9 3 10

---
name: cis-ubuntu1204-v110-9-3-10
description: "Do Not Allow Users to Set Environment Options"
category: cis-os-hardening
version: "1.1.0"
author: cyberstrike-official
tags: [cis, ubuntu, 12.04, linux, authentication, ssh, environment]
cis_id: "9.3.10"
cis_benchmark: "CIS Ubuntu 12.04 LTS Server Benchmark v1.1.0"
tech_stack: [ubuntu, linux]
cwe_ids: []
chains_with: []
prerequisites: []
severity_boost: {}
---

# 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