The feature, which you'll find in iOS 11.4.1, locks down the data connection over the Lightning port one hour after the last time your iOS device is unlocked. This countdown can be reset by simply plugging in Apple's Lightning to USB 3.0 adaptor.
Today, the company released iOS 11.4.1, watchOS 4.3.2, and tvOS 11.4.1 to the general public. macOS 10.13.6 High Sierra is still listed as being in beta.
As a concession to user convenience, the restrictions on the Lightning port only comes into effect if the Lightning port is not now being used, and the device has not been unlocked for more than a hour. After all, if you're listening to music with your iPhone hooked up to a USB audio interface, you don't want the music to stop after an hour, and to re-authenticate before you can continue. This prevents the USB Restricted Mode lock from turning after the one-hour timer.
Restricted Mode is activated if the iPhone or iPad is left locked for more than hour.
The research team isn't sure if third-party adaptors have a similar effect, but this same method can't be achieved with Apple's Lightning to 3.5mm adaptor.
While Apple might fix the flaw in the next iOS 11.4 release or in the iOS 12, Afonin doesn't consider it as a severe vulnerability and calls it an "oversight". The researcher also underlined that with the release of iOS 11.4.1, the procedure of "properly seizing and transporting" an iPhone could include a compatible Lightning accessory.
Apple hasn't confirmed the once-every-ten-minute limits, but if true, that's a really big problem for companies like Grayshift ... and a really good thing for customers who just want their devices to be as secure as possible. In future iOS releases, it may make sense for Apple to make the policies more stringent, by only prolonging the timeouts for accessories that have been previously authorised as trustworthy.
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