The SSH client must not permit GSSAPI authentication unless needed.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-22474	GEN005525	SV-63953r1_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
Oracle Linux 5 Security Technical Implementation Guide	2020-02-25

Details

Check Text ( C-52451r2_chk )
The default setting for GSSAPIAuthentication is "no". Check for a change from the default. # grep -i GSSAPIAuthentication /etc/ssh/ssh_config | grep -v '^#' If the setting is "yes" this is a finding.

Fix Text (F-54533r1_fix)
Edit the SSH client configuration and set the GSSAPIAuthentication" directive set to "no".