Group Identifiers (GIDs) reserved for system accounts must not be assigned to non-system groups.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-780	GEN000360	SV-39094r1_rule	ECSC-1	Medium

Description
Reserved GIDs are typically used by system software packages. If non-system groups have GIDs in this range, they may conflict with system software, possibly leading to the group having permissions to modify system files.

STIG	Date
AIX 6.1 SECURITY TECHNICAL IMPLEMENTATION GUIDE	2018-09-18

Details

Check Text ( C-280r2_chk )
# more /etc/passwd Confirm all accounts with a GID of 99 and below (499 and below for Linux) are used by a system account. If a GID reserved for system accounts, 0 - 99 (0 - 499 for Linux), is used by a non-system account, this is a finding.

Fix Text (F-33336r1_fix)
Change the primary group GID numbers for non-system accounts with reserved primary group GIDs (those less or equal to 99 in general, or 499 for Linux). # smitty chuser