Local users on domain-joined computers must not be enumerated.

From Windows Server 2012/2012 R2 Domain Controller Security Technical Implementation Guide

Part of WINCC-000051

Associated with IA controls: ECSC-1

Associated with: CCI-000381

SV-51611r1_rule Local users on domain-joined computers must not be enumerated.

Vulnerability discussion

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.

Check content

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 Type: REG_DWORD Value: 0

Fix text

Configure the policy value for Computer Configuration -> Administrative Templates -> System -> Logon -> "Enumerate local users on domain-joined computers" to "Disabled".

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