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Early on Tuesday, November 29th, Mozilla was provided with code for an exploit using a previously unknown vulnerability in Firefox. The exploit took advantage of a bug in Firefox to allow the attacker to execute arbitrary code on the targeted system by having the victim load a web page containing malicious JavaScript and SVG code. It used this capability to collect the IP and MAC address of the targeted system and report them back to a central server.
The exploit in this case works in essentially the same way as the “network investigative technique” used by FBI to deanonymize Tor users (as FBI described it in an affidavit). This similarity has led to speculation that this exploit was created by FBI or another law enforcement agency.
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