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RHEL-09-411030 RHEL 9 duplicate User IDs (UIDs) must not exist for interactive users.

DISA STIG library V2R10
All changes in this version
first version loaded CAT II

Maps to AU-3(1), IA-2, IA-8 via CCI-000135, CCI-000764, CCI-000804

Title

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

Control

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.

Discussion

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

Related controls

CCI-000135, CCI-000764, CCI-000804

Fix

Edit the file "/etc/passwd" and provide each interactive user account that has a duplicate UID with a unique UID.