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

From SOLARIS 10 X86 SECURITY TECHNICAL IMPLEMENTATION GUIDE

Associated with IA controls: DCPP-1

Associated with: CCI-001436

SV-26749r1_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.

Check content

Check the SSH client configuration for allowed protocol versions. # grep -i protocol /etc/ssh/ssh_config | grep -v '^#' If the returned protocol configuration allows versions less than 2, this is a finding.

Fix text

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

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