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

From Windows Server 2016 Security Technical Implementation Guide

Associated with: CCI-000381

SV-88187r1_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

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 Type: REG_DWORD Value: 0x00000000 (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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