The regular users default primary group must be staff (or equivalent) on AIX.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-215182	AIX7-00-001016	SV-215182r508663_rule		Medium

Description
The /usr/lib/security/mkuser.default file contains the default primary groups for regular and admin users. Setting a system group as the regular users' primary group increases the risk that the regular users can access privileged resources.

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

Details

Check Text ( C-16380r293997_chk )
Check the default primary group for regular users: # lssec -f /etc/security/mkuser.default -s user -a pgrp The above command should yield the following output: user pgrp=staff If the above command shows that the primary group (pgrp) is not "staff", this is a finding.

Fix Text (F-16378r293998_fix)
Set the default primary groups for regular to be "staff". # chsec -f /etc/security/mkuser.default -s user -a pgrp=staff