The Group Identifiers (GIDs) reserved for AIX system accounts must not be assigned to non-system accounts as their primary group GID.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-215194 | AIX7-00-001035 | SV-215194r991589_rule | CCI-000366 | 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 | |||
| IBM AIX 7.x Security Technical Implementation Guide | 2024-08-16 | |||
Details
Check Text (C-215194r991589_chk)
From the command prompt, run the following command:
# more /etc/passwd
root:!:0:0::/root:/usr/bin/ksh
daemon:!:1:1::/etc:
bin:!:2:2::/bin:
sys:!:3:3::/usr/sys:
adm:!:4:4::/var/adm:
nobody:!:4294967294:4294967294::/:
invscout:*:6:12::/var/adm/invscout:/usr/bin/ksh
srvproxy:*:203:0:Service Proxy Daemon:/home/srvproxy:/usr/bin/ksh
esaadmin:*:7:0::/var/esa:/usr/bin/ksh
sshd:*:212:203::/var/empty:/usr/bin/ksh
doejohn:*:704:1776::/home/doej:/usr/bin/ksh
Confirm all accounts with a primary GID of 99 and below are used by a system account.
If a GID reserved for system accounts, 0 - 99, is used by a non-system account, this is a finding.
Fix Text (F-16390r294034_fix)
Change the primary GID for non-system accounts that have reserved GIDs as their primary GIDs using the following command:
# chuser pgrp=<non_reserved_group_name> <non_system_user_name>