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

From Red Hat Enterprise Linux 6 Security Technical Implementation Guide

Associated with: CCI-000774

SV-50408r1_rule The SSH daemon must be configured to use only the SSHv2 protocol.

Vulnerability discussion

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

Check content

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

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

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