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

From HP-UX 11.31 Security Technical Implementation Guide

Associated with IA controls: DCPP-1

Associated with: CCI-001436

SV-35212r1_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. Note that keywords are case-insensitive and arguments (args) are case-sensitive. keyword=Protocol arg(s)=2 # cat /opt/ssh/etc/ssh_config | tr '\011' ' ' | tr -s ' ' | sed -e 's/^[ \t]*//' | grep -v '^#' | grep -i "Protocol" If Protocol 2,1 (the default) or Protocol 1 are defined on a line without a leading comment, this is a finding.

Fix text

Edit the client configuration file Protocol entry to look like: Protocol 2

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