Many of today"s BitTorrent trackers rely on a ratio system to ensure leechers (P2P users who download data but do not share) to a minimum. The ratio system basically tracks a user"s upload and download amounts and ensures a fair minimum upload ratio is maintained. Now it looks like an exploit has been found which would allow users to "cheat" a tracker into thinking they had a more favourable ratio than they actually did.
However, trackers are already wising up to this exploit and banning users that "trick the tracker" from the network, don"t say you weren"t warned.