Anonymous enumeration of SAM accounts must not be allowed.

From Windows 8 Security Technical Implementation Guide

Part of Restrict Anonymous SAM Enumeration

Associated with IA controls: ECSC-1

SV-48508r1_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.

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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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