The Bluetooth functionality in Lemur Vehicle Monitors BlueDriver before 2016-04-07 supports unrestricted pairing without a PIN, which allows remote attackers to send arbitrary CAN commands by leveraging access to a device inside or adjacent to the vehicle, as demonstrated by a CAN command to disrupt braking or steering.
The software does not restrict or incorrectly restricts access to a resource from an unauthorized actor.
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Access control involves the use of several protection mechanisms such as:
When any mechanism is not applied or otherwise fails, attackers can compromise the security of the software by gaining privileges, reading sensitive information, executing commands, evading detection, etc. There are two distinct behaviors that can introduce access control weaknesses: