UIDs reserved for system accounts must not be assigned to non-system accounts on AIX systems.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-215195 | AIX7-00-001036 | SV-215195r508663_rule | Medium |
| Description |
|---|
| Reserved UIDs are typically used by system software packages. If non-system accounts have UIDs in this range, they may conflict with system software, possibly leading to the user having permissions to modify system files. |
| STIG | Date |
|---|---|
| IBM AIX 7.x Security Technical Implementation Guide | 2022-06-06 |
Details
| Check Text ( C-16393r294036_chk ) |
|---|
| Check the UID assignments of all accounts using: # 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 doej:*:704:1776::/home/doej:/usr/bin/ksh Confirm all accounts with a UID of 128 and below are used by a system account. If a UID reserved for system accounts (0-128) is used by a non-system account, this is a finding. |
| Fix Text (F-16391r294037_fix) |
|---|
| Using the "usermod" command, change the UID numbers for non-system accounts with reserved UIDs (those less or equal to 128): # usermod -u |