Cis Ubuntu1404 V210 5 2 2

---
name: "CIS Ubuntu 14.04 LTS - 5.2.2 Ensure SSH Protocol is set to 2"
description: "Verify SSH is configured to use Protocol version 2 only"
category: "cis-os-hardening"
version: "2.1.0"
author: "cyberstrike-official"
tags:
  - cis
  - ubuntu
  - ubuntu-14.04
  - level-1
  - scored
  - ssh
cis_id: "5.2.2"
cis_benchmark: "CIS Ubuntu Linux 14.04 LTS Benchmark v2.1.0"
tech_stack:
  - ubuntu
  - linux
cwe_ids: []
chains_with: []
prerequisites: []
severity_boost: "high"
---

# 5.2.2 Ensure SSH Protocol is set to 2 (Scored)

## Profile Applicability

- Level 1 - Server
- Level 1 - Workstation

## Description

SSH supports two different and incompatible protocols: SSH1 and SSH2. SSH1 was the original protocol and was subject to security issues. SSH2 is more advanced and secure.

## Rationale

SSH v1 suffers from insecurities that do not affect SSH v2.

## Audit Procedure

Run the following command and verify that output matches:

```bash
grep "^Protocol" /etc/ssh/sshd_config
```

## Expected Result

```
Protocol 2
```

## Remediation

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

```
Protocol 2
```

## Default Value

Protocol 2

## References

- CIS Controls: 3.4 - Use Only Secure Channels For Remote System Administration

## Profile

- Level 1 - Server
- Level 1 - Workstation