Anonymous enumeration of SAM accounts must not be allowed.

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

Part of Restrict Anonymous SAM Enumeration

Associated with: CCI-000366

SV-53122r1_rule Anonymous enumeration of SAM accounts must not be allowed.

Vulnerability discussion

Anonymous enumeration of SAM accounts allows anonymous log on users (null session connections) to list all accounts names, thus providing a list of potential points to attack the system.

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: \System\CurrentControlSet\Control\Lsa\ Value Name: RestrictAnonymousSAM Value Type: REG_DWORD Value: 1

Fix text

Configure the policy value 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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