Over the past few years, mobile devices have become increasingly chatty over the Bluetooth Low Energy (BLE) protocol and this turns out to be a somewhat significant privacy risk.
Seven boffins at University of California San Diego – Hadi Givehchian, Nishant Bhaskar, Eliana Rodriguez Herrera, Héctor Rodrigo López Soto, Christian Dameff, Dinesh Bharadia, and Aaron Schulman – tested the BLE implementations on several popular phones, PCs, and gadgets, and found they can be tracked through their physical signaling characteristics albeit with intermittent success.
That means the devices may emit a unique fingerprint, meaning it’s possible to look out for those fingerprints in multiple locations to figure out where those devices have been and when. This could be used to track people; you’ll have to use your imagination to determine who would or could usefully exploit this. That said, at least two members of the team believe it’s worth product makers addressing this privacy weakness.
Source: The Register