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A few things have to be in place for this to work. First, the scammers need a compromised web server in order to install the malware. Fortunately, there are lots of those around. Second, the malware has to be able to determine which other sites the user has visited. This is possible based on a vulnerability in the JavaScript engine used by Internet Explorer, Firefox, Safari, and Chrome.

New York times said The source of the vulnerability is a specific JavaScript function. When this function is called it leaves a temporary footprint on the computer and any other website can identify this ...