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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
Set Account Expiration Parameters
Ensure shadow Group is Empty
Ensure shadow Group is Empty
An XCCDF Rule
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Ensure shadow Group is Empty
Medium Severity
The shadow group allows system programs which require access the ability to read the /etc/shadow file. No users should be assigned to the shadow group.