| 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:
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
