Title

All RHEL 9 local interactive user home directories must be group-owned by the home directory owner's primary group. (Cat II impact)

Discussion

If the Group Identifier (GID) of a local interactive users home directory is not the same as the primary GID of the user, this would allow unauthorized access to the users files, and users that share the same group may not be able to access files that they legitimately should.

Check Content

Verify the assigned home directory of all local interactive users is group-owned by that user's primary GID with the following command: Note: This may miss local interactive users that have been assigned a privileged user identifier (UID). Evidence of interactive use may be obtained from a number of log files containing system logon information. The returned directory "/home/wadea" is used as an example. $ sudo ls -ld $(awk -F: '($3>=1000)&&($7 !~ /nologin/){print $6}' /etc/passwd) drwxr-x--- 2 wadea admin 4096 Jun 5 12:41 wadea Check the user's primary group with the following command: $ sudo grep $(grep wadea /etc/passwd | awk -F: ‘{print $4}') /etc/group admin:x:250:wadea,jonesj,jacksons If the user home directory referenced in "/etc/passwd" is not group-owned by that user's primary GID, this is a finding.

Fix Text

Change the group owner of a local interactive user's home directory to the group found in "/etc/passwd". To change the group owner of a local interactive user's home directory, use the following command: Note: The example will be for the user "wadea", who has a home directory of "/home/wadea", and has a primary group of users. $ sudo chgrp users /home/wadea

Additional Identifiers

Rule ID: SV-258053r926146_rule

Vulnerability ID: V-258053

Group Title: SRG-OS-000480-GPOS-00227

Expert Comments

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