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


Overview

Finding ID Version Rule ID IA Controls Severity
V-4295 GEN005500 SV-35209r1_rule ECSC-1 DCPP-1 High
Description
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.
STIG Date
HP-UX 11.23 Security Technical Implementation Guide 2015-12-02

Details

Check Text ( C-35053r1_chk )
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 (F-30340r1_fix)
Edit the configuration file and modify the Protocol line entry to appear as follows:

Protocol 2