Joined: 16 Mar 2005
Location: 22° 15' N | 114° 10' E
USB connections make snooping easy
... if a malicious device or one that's been tampered with is plugged into adjacent ports on the same external or internal USB hub, this sensitive information can be captured. ... voltage fluctuations of the USB port's data lines can be monitored from the adjacent ports on the USB hub.
It is simpler to just assume that anyone with physical access to the machine already owns it. So the solution is to never let anyone else, or anyone else's things, near your stuff. As was evidenced by the badUSB things some time ago all sorts of bad things can happen from external devices.
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