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

From Red Hat Enterprise Linux 5 Security Technical Implementation Guide

Associated with IA controls: DCPP-1

Associated with: CCI-001436

SV-37820r1_rule The SSH client must be configured to only use the SSHv2 protocol.

Vulnerability discussion

SSHv1 is not a DoD-approved protocol and has many well-known vulnerability exploits. Exploits of the SSH client could provide access to the system with the privileges of the user running the client.

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Fix text

Edit the /etc/ssh/ssh_config file and add or edit a "Protocol" configuration line not allowing versions less than 2.

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