RHEL 9 duplicate User IDs (UIDs) must not exist for interactive users.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-258045	RHEL-09-411030	SV-258045r926122_rule		Medium

Description
To ensure accountability and prevent unauthenticated access, interactive users must be identified and authenticated to prevent potential misuse and compromise of the system. Satisfies: SRG-OS-000104-GPOS-00051, SRG-OS-000121-GPOS-00062, SRG-OS-000042-GPOS-00020

STIG	Date
Red Hat Enterprise Linux 9 Security Technical Implementation Guide	2023-12-01

Details

Check Text ( C-61786r926120_chk )
Verify that RHEL 9 contains no duplicate UIDs for interactive users with the following command: $ sudo awk -F ":" 'list[$3]++{print $1, $3}' /etc/passwd If output is produced and the accounts listed are interactive user accounts, this is a finding.

Fix Text (F-61710r926121_fix)
Edit the file "/etc/passwd" and provide each interactive user account that has a duplicate UID with a unique UID.