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	DCPP-1 ECSC-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	2015-06-12

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.

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