Anonymous enumeration of SAM accounts must not be allowed.

From Windows 8/8.1 Security Technical Implementation Guide

Part of Restrict Anonymous SAM Enumeration

Associated with IA controls: ECSC-1

Associated with: CCI-000366

SV-48508r2_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

Analyze the system using the Security Configuration and Analysis snap-in. (See "Performing Analysis with the Security Configuration and Analysis Snap-in" in the STIG Overview document.) Expand the Security Configuration and Analysis tree view. Navigate to Local Policies -> Security Options. If the value for "Network access: Do not allow anonymous enumeration of SAM accounts" is not set to "Enabled", this is a finding. The policy referenced configures the following registry value: 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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