If GSSAPI authentication is not required on AIX, the SSH daemon must disable GSSAPI authentication.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-215292	AIX7-00-002108	SV-215292r508663_rule		Medium

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
IBM AIX 7.x Security Technical Implementation Guide	2022-06-06

Details

Check Text ( C-16490r294327_chk )
Ask the SA if GSSAPI authentication is used for SSH authentication to the system. If so, this is not applicable. Check the SSH daemon configuration for the GSSAPI authentication setting: # grep -i GSSAPIAuthentication /etc/ssh/sshd_config | grep -v '^#' GSSAPIAuthentication no If the setting is not set to "no", this is a finding.

Fix Text (F-16488r294328_fix)
Edit "/etc/ssh/sshd_config" and remove the "GSSAPIAuthentication" setting or change the value to "no". Refresh sshd: # stopsrc -s sshd # startsrc -s sshd