The SSH daemon must be configured to use only the SSHv2 protocol.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-219560	OL6-00-000227	SV-219560r793817_rule		High

Description
SSH protocol version 1 suffers from design flaws that result in security vulnerabilities and should not be used.

STIG	Date
Oracle Linux 6 Security Technical Implementation Guide	2021-12-03

Details

Check Text ( C-21285r358220_chk )
To check which SSH protocol version is allowed, run the following command: # grep Protocol /etc/ssh/sshd_config If configured properly, output should be Protocol 2 If it is not, this is a finding.

Fix Text (F-21284r358221_fix)
Only SSH protocol version 2 connections should be permitted. The default setting in "/etc/ssh/sshd_config" is correct, and can be verified by ensuring that the following line appears: Protocol 2