AIX /etc/security/mkuser.sys.custom file must not exist unless it is needed for customizing a new user account.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-215169	AIX7-00-001000	SV-215169r508663_rule		Medium

Description
The "/etc/security/mkuser.sys.custom" is called by "/etc/security/mkuser.sys" to customize the new user account when a new user is created, or a user is logging into the system without a home directory. An improper "/etc/security/mkuser.sys.custom" script increases the risk that non-privileged users may obtain elevated privileges. It must not exist unless it is needed.

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

Details

Check Text ( C-16367r293958_chk )
Check if the "/etc/security/mkuser.sys.custom" file exists: # ls /etc/security/mkuser.sys.custom If the above command shows the file exists, this is a finding.

Fix Text (F-16365r293959_fix)
Remove the "/etc/security/mkuser.sys.custom" file using the following command: # rm /etc/security/mkuser.sys.custom