The Oracle Linux operating system must be configured so that all local interactive user home directories are group-owned by the home directory owners primary group.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-221731	OL07-00-020650	SV-221731r880597_rule		Medium

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

STIG	Date
Oracle Linux 7 Security Technical Implementation Guide	2023-06-02

Details

Check Text ( C-23446r880595_chk )
Verify the assigned home directory of all local interactive users is group-owned by that user's primary GID. Check the home directory assignment for all local interactive users on the system with the following command: # ls -ld $(awk -F: '($3>=1000)&&($7 !~ /nologin/){print $6}' /etc/passwd) -rwxr-x--- 1 smithj users 13 Apr 1 04:20 /home/smithj Check the user's primary group with the following command: # grep $(grep smithj /etc/passwd \| awk -F: '{print $4}') /etc/group users:x:250:smithj,marinc,chongt If the user home directory referenced in "/etc/passwd" is not group-owned by that user's primary GID, this is a finding.

Check Text ( C-23446r880595_chk )

Verify the assigned home directory of all local interactive users is group-owned by that user's primary GID.

Check the home directory assignment for all local interactive users on the system with the following command:

# ls -ld $(awk -F: '($3>=1000)&&($7 !~ /nologin/){print $6}' /etc/passwd)

-rwxr-x--- 1 smithj users 13 Apr 1 04:20 /home/smithj

Check the user's primary group with the following command:

# grep $(grep smithj /etc/passwd | awk -F: '{print $4}') /etc/group

users:x:250:smithj,marinc,chongt

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 (F-23435r880596_fix)
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 "smithj", who has a home directory of "/home/smithj", and has a primary group of users. # chgrp users /home/smithj