IPhone SE, iPhone 6s suffer fast battery drain on iOS 11.4

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iOS 11.4.1 users have the ability to flip the feature on or off under the Touch ID & Passcode or Face ID & Passcode settings menu, under USB Accessories. In other words, once the police officer seizes an iPhone, he or she would need to immediately connect that iPhone to a compatible USB accessory to prevent USB Restricted Mode lock after one hour.

They suggest using the $39 Apple Lightning USB3 Camera Adapter. On the contrary; the company today released the latest version of the software update, iOS 11.4.1.

The team of researchers at ElcomSoft have reiterated that once the USB Restricted Mode is enabled, it restricts all the data communications that occur over the Lightning port.

Importantly, this technique would only work if the iOS device is not already in USB Restricted Mode when captured. The way it works is that when an hour has lapsed without the iPhone or iPad being unlocked with a passcode, the Lightning-USB connection will disable any data transfer. The toggle is off by default, and that's how you'll want it in order to use the feature.

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If however someone does get to a phone within that hour period, they can shove in a USB accessory and prevent the smartphone from going into restricted mode until they have a chance to attach a cracking box later on.

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".

Elcomsoft engineer Oleg Afonin noted that testing showed that once USB Restricted Mode kicks in, there is no obvious way to break it.

Aside from this, iOS 11.4.1 includes bug fixes for the Find My AirPods feature and syncing with Exchange accounts. Prior to iOS 11.4.1, isolating the iPhone inside a Faraday bag and connecting it to a battery pack would be enough to safely transport it to the lab. 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.