The RHEL 8 SSH daemon must not allow unused methods of authentication.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-230291	RHEL-08-010521	SV-230291r627750_rule		Medium

Description
Configuring these settings for the SSH daemon provides additional assurance that remote logon via SSH will not use unused methods of authentication, even in the event of misconfiguration elsewhere.

STIG	Date
Red Hat Enterprise Linux 8 Security Technical Implementation Guide	2021-03-04

Details

Check Text ( C-32960r567619_chk )

Verify the SSH daemon does not allow authentication using unused methods of authentication with the following command: $ sudo grep -i "KerberosAuthentication\|GSSAPIAuthentication" /etc/ssh/sshd_config KerberosAuthentication no GSSAPIAuthentication no If the values are returned as "yes", the returned line is commented out, no output is returned, or has not been documented with the ISSO, this is a finding.

Fix Text (F-32935r567620_fix)
Configure the SSH daemon to not allow authentication using unused methods of authentication. Add the following line in "/etc/ssh/sshd_config", or uncomment the line and set the value to "no": KerberosAuthentication no GSSAPIAuthentication no The SSH daemon must be restarted for the changes to take effect. To restart the SSH daemon, run the following command: $ sudo systemctl restart sshd.service