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Cross Site Scripting (XSS) | Elegant Code
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Firesheep Sniffs Out Facebook and Other User Credentials on Wi-Fi Hotspots
Firefox: Firesheep sniffs out and steals cookies—and the account and identity of the owner in the process—of popular web sites (like Facebook and Twitter) from the browsing sessions of other users on the Wi-Fi hotspot you're attached to. Firesheep is a proof-of-concept Firefox extension created by Eric Butler to show how leaky the security many popular web sites (like Facebook, Flickr, Amazon.com, Dropbox, Evernote, and more) employ is. The problem, as Firesheep shockingly demonstrates, is that many web sites only encrypt your login. Once you are logged in they use an unsecured connection with a simple cookie check.