vnet,
As far as i know you can't. Only if you're having alot of luck on open ports (they must be all open). Otherwise you can't i'm affraid, so it's still a big gamble, you should think logical, abit of a user uses the newest SP's, tho, this aint true always.... So, kinda hard, still it's a useful exploit definately for a DOS

But hey, who wants to dos if he they can penatrate first :]
Anyway, if someone DOES know a technique to find out the SP it would be really usefull, post it here!
Lat0r dudes and dudettes :]
woutiir