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-215169r958362_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	2024-08-16

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