The LLTD Responder in Microsoft Windows Vista does not send the Mapper a response to a DISCOVERY packet if another host has sent a spoofed response first…

The LLTD Responder in Microsoft Windows Vista does not send the Mapper a response to a DISCOVERY packet if another host has sent a spoofed response first, which allows remote attackers to spoof arbitrary hosts via a network-based race condition, aka the "Total Spoof" attack.