The Windows Firewall must block unicast response to multicast or broadcast messages for the Private Profile.

From Windows 7 Security Technical Implementation Guide

Part of Windows Firewall Private - Unicast Response

Associated with IA controls: ECSC-1

SV-25233r2_rule The Windows Firewall must block unicast response to multicast or broadcast messages for the Private Profile.

Vulnerability discussion

A firewall provides a line of defense against attack. To be effective, it must be enabled and properly configured. Unicast responses to multicast or broadcast messages for a private connection will be blocked. This helps minimize the risk of an attacker using broadcast or multicast traffic to deliver malicious payloads.

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Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Windows Firewall with Advanced Security -> Windows Firewall with Advanced Security -> Windows Firewall Properties (this link will be in the right pane) -> Private Profile Tab -> Settings (select Customize) -> Unicast response, "Allow unicast response" to "No". Configure a comparable setting if a third party firewall is used.

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