The SSH client must not permit GSSAPI authentication unless needed.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-22474	GEN005525	SV-46053r1_rule		Low

Description
GSSAPI authentication is used to provide additional authentication mechanisms to applications. Allowing GSSAPI authentication through SSH exposes the system’s GSSAPI to remote hosts, increasing the attack surface of the system. GSSAPI authentication must be disabled unless needed.

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

Details

Check Text ( C-43324r1_chk )
Check the SSH clients configuration for the GSSAPIAuthentication setting. # grep -i GSSAPIAuthentication /etc/ssh/ssh_config | grep -v '^#' If no lines are returned, or the setting is set to "yes", this is a finding.

Fix Text (F-39409r1_fix)
Edit the SSH client configuration and set (add if necessary) a "GSSAPIAuthentication" directive set to "no".