Positron PX360BT Car Alarm System Replay Attack Vulnerability

A replay attack vulnerability has been identified in the Positron PX360BT car alarm system, specifically in units with software revision 8. The vulnerability arises from a failure to implement effective rolling code security, allowing attackers to capture and reuse RF signals from the remote control. This flaw enables unauthorized disarming of the alarm, unlocking of car doors, and even starting the vehicle without physical access or the original remote. The vulnerability exposes users to significant risks, including vehicle theft and loss of trust in the alarm's anti-cloning claims.

Impact

Exploitation of this vulnerability allows for unauthorized disarming of the car alarm, unlocking of car doors, and starting of the vehicle without physical access or the original remote. This could lead to vehicle theft, vandalism, and personal safety concerns.

Reproduction

The vulnerability can be reproduced by capturing RF signals from the Positron PX360BT remote control using affordable Software-Defined Radio (SDR) tools, such as Flipper Zero or HackRF. Once the signals are captured, they can be replayed to unlock the vehicle, disarm the alarm, or start the vehicle, bypassing the alarm's security measures.

Remediation

Positron should release a firmware update to revise the rolling code algorithm, ensuring proper synchronization and invalidation of used codes. Additionally, hardware updates may be necessary to ensure that receiver modules handle rolling code security correctly.