Common Controls Hub
Windows Server 2019 local users on domain-joined member servers must not be enumerated.
The username is one part of logon credentials that could be used to gain access to a system. Preventing the enumeration of users limits this information to authorized personnel.
Windows Server 2019 Security Technical Implementation Guide
Check Text ( C-92735r1_chk )
This applies to member servers. For domain controllers and standalone systems, this is NA.
If the following registry value does not exist or is not configured as specified, this is a finding:
Registry Hive: HKEY_LOCAL_MACHINE
Registry Path: \SOFTWARE\Policies\Microsoft\Windows\System\
Value Name: EnumerateLocalUsers
Value: 0x00000000 (0)
Fix Text (F-99663r1_fix)
Configure the policy value for Computer Configuration >> Administrative Templates >> System >> Logon >> "Enumerate local users on domain-joined computers" to "Disabled".