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RHEL-10-400160 RHEL 10 must ensure that all local interactive user home directories are group-owned by the home directory owner's primary group.

DISA STIG library V1R3
All changes in this version
first version loaded CAT II

Maps to AC-3, SC-5 via CCI-000213, CCI-002385

Title

RHEL 10 must ensure that all local interactive user home directories are group-owned by the home directory owner's primary group.

Control

Verify RHEL 10 interactive users' home directories are group-owned by the 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 several log files containing system login information. The returned directory "/home/disauser" is used as an example. $ sudo ls -ld $(awk -F: '($3>=1000)&&($7 !~ /nologin/){print $6}' /etc/passwd) drwxr-x--- 2 disauser admin 4096 Jun 5 12:41 disauser Check the user's primary group with the following command: $ sudo grep $(grep disauser /etc/passwd | awk -F: '{print $4}') /etc/group admin:x:250:disauser,doduser,nsauser If the user home directory referenced in "/etc/passwd" is not group-owned by that user's primary GID, this is a finding.

Discussion

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. Users who share the same group may not be able to access files that they legitimately should be able to access. Satisfies: SRG-OS-000080-GPOS-00048, SRG-OS-000420-GPOS-00186

Related controls

CCI-000213, CCI-002385

Fix

Configure RHEL 10 interactive users' home directories to be group-owned by the user's primary GID. 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 "disauser", who has a home directory of "/home/disauser" and has a primary group of users. $ sudo chgrp users /home/disauser