A security vulnerability known as the “RollJam” attack allows hackers to intercept and replay wireless key fob signals, potentially granting unauthorized access to cars and garages. This vulnerability exploits weaknesses in common keyless entry systems, affecting millions of vehicles. By using a Car Alarm Frequency Scanner, attackers can jam the legitimate signal from the key fob and record the unique code transmitted. This captured code can then be used to unlock the car or garage door at a later time.
Understanding the RollJam Attack
The RollJam attack works by employing a device that jams the radio frequency used by key fobs and simultaneously records the transmitted codes. When a car owner presses their key fob, the RollJam device blocks the signal from reaching the car, preventing it from unlocking. Simultaneously, it intercepts and stores the code. The device then transmits a previously recorded code, which the car recognizes, leading the owner to believe the key fob malfunctioned. Unbeknownst to the owner, a fresh, unused code has been captured and stored by the RollJam for later use. This allows the attacker to unlock the car at their convenience.
Vulnerable Vehicles and Systems
Testing has shown that various car brands, including Nissan, Cadillac, Ford, Toyota, Lotus, Volkswagen, and Chrysler, as well as certain alarm systems and garage door openers, are susceptible to this type of attack. The vulnerability stems from the use of Keeloq and Hisec chips in these systems, which do not utilize expiring codes. This makes them vulnerable to replay attacks. While some manufacturers, like Cadillac, claim newer models have updated systems, a significant number of vehicles remain at risk.
The Need for Improved Security
Although similar jamming and replay attacks have been demonstrated before, the RollJam attack highlights the need for enhanced security measures in keyless entry systems. The core issue lies in the use of static or rolling codes that don’t expire.
More secure systems, like those employing Dual Keeloq chips, use time-sensitive codes that expire quickly, rendering replay attacks ineffective. Two-factor authentication methods used in online security often rely on codes that expire within seconds, providing a higher level of protection. Car manufacturers should adopt similar practices to safeguard vehicles against these vulnerabilities.
Conclusion
The RollJam attack and the use of a car alarm frequency scanner underscore the critical need for upgraded security in keyless entry systems. The widespread vulnerability of vehicles relying on non-expiring codes calls for immediate action from manufacturers. Implementing expiring codes or other robust security measures is crucial to protect car owners from potential theft and unauthorized access. Until then, millions of vehicles remain susceptible to this relatively simple attack.
