[zeugma]

Not just porn. Warez sites tend to be buggy, some newsgroups(age showing), and chat programs can be vectors for the malware.

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This type of attack isn't very effective against most people who don't go to such sites. It could be extremely dangerous though, if someone incorporated it into a hack of a legitimate site. I'd asses the danger of this defect to be low risk, but MS should put out a patch promptly to protect their customers.

[ShadowAce]

This type of attack isn't very effective against most people who don't go to such sites.

True, but it still affects those of us who don't go to those sites, by zombifying those who do. Those zombies then send out attacks/spam/etc to everyone else.