AIX must disable Kerberos Authentication in ssh config file to enforce access restrictions.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-91529	AIX7-00-002107	SV-101627r1_rule		Medium

Description
Without auditing the enforcement of access restrictions against changes to the application configuration, it will be difficult to identify attempted attacks and an audit trail will not be available for forensic investigation for after-the-fact actions. Enforcement actions are the methods or mechanisms used to prevent unauthorized changes to configuration settings. Enforcement action methods may be as simple as denying access to a file based on the application of file permissions (access restriction). Audit items may consist of lists of actions blocked by access restrictions or changes identified after the fact.

Description

Without auditing the enforcement of access restrictions against changes to the application configuration, it will be difficult to identify attempted attacks and an audit trail will not be available for forensic investigation for after-the-fact actions. Enforcement actions are the methods or mechanisms used to prevent unauthorized changes to configuration settings. Enforcement action methods may be as simple as denying access to a file based on the application of file permissions (access restriction). Audit items may consist of lists of actions blocked by access restrictions or changes identified after the fact.

STIG	Date
IBM AIX 7.x Security Technical Implementation Guide	2020-02-24

Details

Check Text ( C-90683r1_chk )
Check the SSH daemon configuration for the Kerberos authentication setting: # grep -i KerberosAuthentication /etc/ssh/sshd_config \| grep -v '^#' If the setting is present and set to "yes", this is a finding.

Fix Text (F-97727r1_fix)
Edit the "/etc/ssh/sshd_config" file and add or change the "KerberosAuthentication" value of the setting to "no". Refresh sshd: # stopsrc -s sshd # startsrc -s sshd