this post was submitted on 23 May 2024
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Teslas Can Still Be Stolen With a Cheap Radio Hack—Despite New Keyless Tech (www.wired.com)
submitted 10 months ago by jeffw@lemmy.world to c/technology@lemmy.world
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[–] partial_accumen@lemmy.world 15 points 10 months ago (1 children)

Couldn't a Model 3/Y owner also just disable the phonekey and use the NFC cards? NFC only broadcasts a few inches right? I would think that would be VERY hard for a malicious actor to capture with relay/replay attack.

Following that, is it possible to use the Phonekey only in NFC mode or is it always broadcasting on Bluetooth LE and NFC?

[–] digdug@kbin.social 11 points 10 months ago* (last edited 10 months ago) (1 children)

I just tried this a couple different ways:

  1. Removing permission for "nearby devices" - this unfortunately appears to block both Bluetooth and NFC permission
  2. Turning off the phone's Bluetooth - NFC still works while the Bluetooth radio is off, but you'd basically never be able to safely use Bluetooth anytime you aren't watching your car. Setting a PIN is still unfortunately the only way to go, and hope that a dedicated attacker doesn't also find a way to capture your PIN (e.g. camera zoomed in on your screen).
[–] partial_accumen@lemmy.world 3 points 10 months ago

So we'd need Tesla to push a software change in the app with an option to turn off the Bluetooth LE signal, but leave the NFC on to continue to use Phonekey safely.

I guess the only safe alternative is using the NFC cards.