The SSH daemon 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-35209r1_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.

Check content

Check the SSH daemon configuration. Note that keywords are case-insensitive and arguments (args) are case-sensitive. keyword=Protocol Required arg(s)=2 Default arg values include: "2,1" Note: When the default "arg" value exactly matches the required "arg" value (see above), the are not required to exist (commented or uncommented) in the ssh (client) or sshd (server) configuration file. While not required, it is recommended that the configuration file(s) be populated with all keywords and assigned arg values as a means to explicitly document the ssh(d) binary's expected behavior. Examine the file. # cat /opt/ssh/etc/sshd_config | tr '\011' ' ' | tr -s ' ' | sed -e 's/^[ \t]*//' | grep -v '^#' | grep -i "Protocol" | cut -f 2,2 -d " " If the return value is "1" or "2,1" (double quotes are for emphasis only) , this is a finding.

Fix text

Edit the configuration file and modify the Protocol line entry to appear as follows: Protocol 2

Pro Tips

Lavender hyperlinks in small type off to the right (of CSS class id, if you view the page source) point to globally unique URIs for each document and item. Copy the link location and paste anywhere you need to talk unambiguously about these things.

You can obtain data about documents and items in other formats. Simply provide an HTTP header Accept: text/turtle or Accept: application/rdf+xml.