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Security researcher Robert Fuller discovered an attack method with which Windows and Mac user credentials can be stolen from a locked machine.
This attack is affected against actual Windows and Mac OS computers on which the user has already logged in.
The researcher used USB-based Ethernet dongles like USB Armory or Hak5 Turtle , for which he modified the firmware code to run special software that sets the plug-and-play USB device as the network gateway, DNS, and WPAD servers on the computer it’s connected to.
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