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-45997r2_rule		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
SUSE Linux Enterprise Server v11 for System z Security Technical Implementation Guide	2018-09-19

Details

Check Text ( C-43280r3_chk )
Locate the sshd_config file: # more /etc/ssh/sshd_config Examine the file. If the variables 'Protocol 2,1’ or ‘Protocol 1’ are defined on a line without a leading comment, this is a finding.

Fix Text (F-39363r4_fix)
Edit the sshd_config file and set the "Protocol" setting to "2". Restart the SSH daemon. # /sbin/service sshd restart