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

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-69229	ZSSH0010	SV-83851r1_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
z/OS TSS STIG	2018-12-20

Details

Check Text ( C-70035r1_chk )
Locate the SSH daemon configuration file. May be found in /etc/ssh/ directory. Alternately: From UNIX System Services ISPF Shell navigate to ribbon select tools. Select option 1 - Work with Processes. If SSH Daemon is not active there is no finding. Examine SSH daemon configuration file. If the variables 'Protocol 2,1’ or ‘Protocol 1’ are defined on a line without a leading comment, this is a finding.

Check Text ( C-70035r1_chk )

Locate the SSH daemon configuration file.
May be found in /etc/ssh/ directory.
Alternately:
From UNIX System Services ISPF Shell navigate to ribbon select tools.
Select option 1 - Work with Processes.

If SSH Daemon is not active there is no finding.

Examine SSH daemon configuration 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-75791r1_fix)
Edit the sshd_config file and set the "Protocol" setting to "2".