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

From Red Hat Enterprise Linux 5 Security Technical Implementation Guide

Associated with IA controls: ECSC-1, DCPP-1

Associated with: CCI-001436

SV-37818r2_rule The SSH daemon 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 daemon could provide immediate root access to the system.

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Fix text

Edit the sshd_config file and set the "Protocol" setting to "2". If using the F-Secure SSH server, set the "Ssh1Compatibility" setting to "no". Restart the SSH daemon. # /sbin/service sshd restart

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