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XCCDF
Guide to the Secure Configuration of Ubuntu 20.04
System Settings
Account and Access Control
Protect Accounts by Restricting Password-Based Login
Verify Proper Storage and Existence of Password Hashes
Ensure no duplicate UIDs exist
Ensure no duplicate UIDs exist
An XCCDF Rule
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Ensure no duplicate UIDs exist
Medium Severity
Although the useradd program will not let you create a duplicate User ID (UID), it is possible for an administrator to manually edit the /etc/passwd file and change the UID field. Users must be assigned unique UIDs for accountability and to ensure appropriate access protections.