Basically, an exploit has been discovered that allows a remote user to execute arbitrary bytecode through a wc3 map. There is a possibility to make this map have the same name and look exactly like another map, but it would actually download a virus into your computer and you would never know it.
DotA has been targeted by this attack; there are custom games which have the same preview image as DotA, and when you enter them they are downloaded before you enter the game (very small file size) thus resulting in you not knowing this is a fake map. Once the game starts, the malicious code is executed.
This means a malicious user will be able to grab everyone's cd-keys in a game, plant a keylogger in your computer, any known virus etc.
It is extremely recommended to not play any custom games with people you do not know. You should also refrain from downloading any new maps from a source that you do not completely trust, until a patch is released. Also, if you see too many people downloading a map you know they should already have, it is very possible that this is a hacked map. You should notify them and leave the game immediately.
COMODO is the only known program to prevent warcraft from running the malicious code as of now. Every other AV/firewall/anti-malware program other than that does not currently prevent this exploit from being used.
Blizzard has been notified about the issue.
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