I was looking at RSnake's Mr. T the other day. For those who don't know, Rsnake developed a pretty simple proof of concept showing the information that your browser will disclose to someone with a website. You can see a demo here. Notice that your browser gives up your web-based email address?
This got me thinking; why waste your time phishing for passwords? It's a given that everyone reuses passwords. A bit of googling turned up turned up a small academic study showing that the average was just over 3 per person.
So what does all this mean? Where does almost every website send your password? Right to your email account in most cases. So if I can read your email, I can own any account I want that is associated with that email. I can get a password reminder, or a password reset sent there and if I'm smart, the user would never know until it is too late.
So why phish for passwords? I could create a site that grabbed all the user's data (and probably a bit more) than Mr. T grabs, and get the user to give me a password. I could give the user something that they want (think Free Porn). Since I have a one in three chance that the password, (or even one in ten for that matter) I could go take over a lot of users lives. Bank accounts, your resume, your mother's maiden name, passwords to your favorite sites? I read user's email all the time - that's all there for the taking.
Now the second question is; What to do about it? This is a acknowledged problem, but short of carrying around an encrypted USB drive (user's don't want that), or using some form of two-factor authentication, I don't see any answers on the horizon.
The scary thing is, if I'm thinking about this, someone's already doing it.