I don't know if this was posted before. Apologies if I'm repeating a thread.
Note in bold the makes and models which were marked vulnerable.
From Wired dated Mar 21, 2016:
For years, car owners with keyless entry systems have reported thieves approaching their vehicles with mysterious devices and effortlessly opening them in seconds. After having his Prius burgled repeatedly outside his Los Angeles home, the New York Times‘ former tech columnist Nick Bilton came to the conclusion that the thieves must be amplifying the signal from the key fob in the house to trick his car’s keyless entry system into thinking the key was in the thieves’ hand. He eventually resorted to keeping his keys in the freezer.
Now a group of German vehicle security researchers has released new findings about the extent of that wireless key hack, and their work ought to convince hundreds of thousands of drivers to keep their car keys next to their Pudding Pops. The Munich-based automobile club ADAC late last week made public a study it had performed on dozens of cars to test a radio “amplification attack” that silently extends the range of unwitting drivers’ wireless key fobs to open cars and even start their ignitions, as first reported by the German business magazine WirtschaftsWoche. The ADAC researchers say that 24 different vehicles from 19 different manufacturers were all vulnerable, allowing them to not only reliably unlock the target vehicles but also immediately drive them away.
“This clear vulnerability in [wireless] keys facilitates the work of thieves immensely,” reads a post in German about the researchers’ findings on the ADAC website. “The radio connection between keys and car can easily be extended over several hundred meters, regardless of whether the original key is, for example, at home or in the pocket of the owner.”...
Here’s the full list of vulnerable vehicles from their findings, which focused on European models: the Audi A3, A4 and A6, BMW’s 730d, Citroen’s DS4 CrossBack, Ford’s Galaxy and Eco-Sport, Honda’s HR-V, Hyundai’s Santa Fe CRDi, KIA’s Optima, Lexus’s RX 450h, Mazda’s CX-5, MINI’s Clubman, Mitsubishi’s Outlander, Nissan’s Qashqai and Leaf, Opel’s Ampera, Range Rover’s Evoque, Renault’s Traffic, Ssangyong’s Tivoli XDi, Subaru’s Levorg, Toyota’s RAV4, and Volkswagen’s Golf GTD and Touran 5T.
Only the BMW i3 resisted the researchers’ attack, though they were still able to start its ignition. And the researchers posit—but admit they didn’t prove—that the same technique likely would work on other vehicles, including those more common in the United States, with some simple changes to the frequency of the equipment’s radio communications...
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