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

From Windows 8/8.1 Security Technical Implementation Guide

Associated with IA controls: ECSC-1

Associated with: CCI-000381

SV-48303r2_rule Connected 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 unauthorized 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 Subkey: \Software\Policies\Microsoft\Windows\System\ Value Name: DontEnumerateConnectedUsers Type: REG_DWORD Value: 1

Fix text

Configure the policy value for Computer Configuration -> Administrative Templates -> System -> Logon -> "Do not enumerate connected users on domain-joined computers" to "Enabled".

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