after looking over here
http://www.gnucitizen.org/blog/flash-upnp-attack-faq
it seems that not even one person has been hit with this yet.
seems it might be a good idea to block flash and just enable it when you're using a flash-based site like youtube (also speeds up surfing). you can use flashblock extension for ff or in opera go to tools>quick preferences> and uncheck enable plugins. if you're using ie I'm not certain how to block flash (you're probably beyond help anyways in that case--just kidding!
).
if you're feeling clever you can disable UPnP and do things the old fashioned way.
seems that if this becomes any kind of a problem (i.e. one or more ppl affected by it) they will patch the security hole in the next release of flash, so its always good to stay updated.
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