The Smart Lock Feature allows Android users (Android version 5.0 and later) to automatically unlock their smartphone whenever a trusted device, Wi-Fi network or geo location is in close proximity. Trusted devices could either be NFC tags or Bluetooth devices. Looking at Bluetooth devices, it turned out that the Smart Lock implementation had at least one security issue that got resolved.
The BlueBump attack is the Bluetooth equivalent to a very cool physical security thread called key bumping. When used correctly, an appropriate bump key can be used to open any lock in seconds. Since the BlueBump attack is also about keys (link keys in this case) we named this attack after this amazing technique.