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

STIG ID: RHEL-09-411045  |  SRG: SRG-OS-000104-GPOS-00051 |  Severity: medium |  CCI: CCI-000764 |  Vulnerability Id: V-258048 | 

Vulnerability Discussion

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.

Check

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

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.
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