All AIX interactive users home directories must be group-owned by the home directory owner primary group.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-91763	AIX7-00-002086	SV-101861r1_rule		Medium

Description
If the Group Identifier (GID) of the home directory is not the same as the GID of the user, this would allow unauthorized access to files.

STIG	Date
IBM AIX 7.x Security Technical Implementation Guide	2020-02-24

Details

Check Text ( C-90917r3_chk )
Check the group ownership for each user in the "/etc/passwd" file using command: # cut -d: -f6 /etc/passwd \| xargs ls -lLd drwxr-xr-x 21 root system 4096 Jan 29 09:58 / drwxr-xr-x 4 bin bin 45056 Jan 24 12:31 /bin drwxr-xr-x 2 doejohn staff 256 Jan 25 13:18 /home/doejohn drwxr-xr-x 2 sshd system 256 Aug 11 2017 /home/srvproxy drwx------ 2 root system 256 Jan 30 12:54 /root drwxrwxr-x 4 bin bin 256 Mar 23 2017 /usr/sys drwxrwxr-x 15 root adm 4096 Jan 24 12:26 /var/adm drwxr-xr-x 6 root system 4096 Jan 24 07:34 /var/adm/invscout drwxr-xr-x 8 esaadmin system 256 Jan 24 09:02 /var/esa If any user's home directory is not group-owned by the assigned user's primary group, this is a finding. Home directories for application accounts requiring different group ownership must be documented using site-defined procedures.

Check Text ( C-90917r3_chk )

Check the group ownership for each user in the "/etc/passwd" file using command:

# cut -d: -f6 /etc/passwd | xargs ls -lLd

drwxr-xr-x 21 root system 4096 Jan 29 09:58 /

drwxr-xr-x 4 bin bin 45056 Jan 24 12:31 /bin

drwxr-xr-x 2 doejohn staff 256 Jan 25 13:18 /home/doejohn

drwxr-xr-x 2 sshd system 256 Aug 11 2017 /home/srvproxy

drwx------ 2 root system 256 Jan 30 12:54 /root

drwxrwxr-x 4 bin bin 256 Mar 23 2017 /usr/sys

drwxrwxr-x 15 root adm 4096 Jan 24 12:26 /var/adm

drwxr-xr-x 6 root system 4096 Jan 24 07:34 /var/adm/invscout

drwxr-xr-x 8 esaadmin system 256 Jan 24 09:02 /var/esa

If any user's home directory is not group-owned by the assigned user's primary group, this is a finding.

Home directories for application accounts requiring different group ownership must be documented using site-defined procedures.

Fix Text (F-97961r1_fix)
Change the group owner for users home directories to the primary group of the assigned user: # chgrp (Replace examples with appropriate group and home directory.) Document all changes.