Anonymous enumeration of SAM accounts will not be allowed.

From Windows Server 2008 R2 Domain Controller Security Technical Implementation Guide

Part of Restrict Anonymous SAM Enumeration

Associated with IA controls: ECSC-1

SV-33732r1_rule Anonymous enumeration of SAM accounts will not be allowed.

Vulnerability discussion

This is a Category 1 finding as it allows anonymous logon users (null session connections) to list all account names, thus providing a list of potential points to attack the system.

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Fix text

Configure the policy values for Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options -> “Network access: Do not allow anonymous enumeration of SAM accounts” to “Enabled".

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