All RHEL 9 interactive users must have a primary group that exists.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-258048	RHEL-09-411045	SV-258048r958482_rule		Medium

Description

If a user is assigned the Group Identifier (GID) of a group that does not exist on the system, and a group with the GID is subsequently created, the user may have unintended rights to any files associated with the group.

STIG	Date
Red Hat Enterprise Linux 9 Security Technical Implementation Guide	2024-12-04

Details

Check Text (C-61789r926129_chk)

Verify that all RHEL 9 interactive users have a valid GID.

Check that the interactive users have a valid GID with the following command:

$ sudo pwck -qr

If the system has any interactive users with duplicate GIDs, this is a finding.

Fix Text (F-61713r926130_fix)

Configure the system so that all GIDs are referenced in "/etc/passwd" are defined in "/etc/group".

Edit the file "/etc/passwd" and ensure that every user's GID is a valid GID.