IPhone Users Report Battery Life Dropped Significantly After iOS 11.4 Update

Enter your passcode tap switch to Off position

IPhone Users Report Battery Life Dropped Significantly After iOS 11.4 Update

Security researchers at ElcomSoft claim to have found a loophole in the new USB Restricted Mode, which rolled out Monday as part of iOS 11.4.1.

Computer security forensics firm ElcomSoft has found a $39 device - one Apple sells on its on website - that runs contrary to Apple's instructions, fooling the restricted mode and giving access to anyone using the device.

Once you've enabled USB Restricted Mode, your iPhone will completely shut off USB access to the iPhone if your phone hasn't been unlocked for more than an hour, eliminating the potential for attack. There is detailed release note only for the iOS update, which mentions the USB Restricted Mode.

The latest update to iOS introduces a new USB Restricted Mode which is supposed to prevent the Lightning port of an iPhone or iPad being used to transfer data an hour after the device is locked.

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The accompanying explanation gives no indication of its real goal: "Unlock iPhone to allow USB accessories to connect when it has been more than hour since your iPhone was locked", it says underneath a sliding bar.

It's worth noting that nobody has been able to hack USB Restricted Mode yet, once it's actually been an hour since you unlocked the phone.

"With the release of iOS 11.4.1, the procedure for properly seizing and transporting iPhone devices may be altered to include a compatible Lightning accessory".

In iOS 11.4.1, and also in the current iOS 12 beta, if the Lightning port isn't used for an hour, it is deactivated. However, this doesn't mean that the USB connectivity with an Apple device is entirely safe.

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A really interesting tidbit from the ElcomSoft report is that since iOS 11.4, Grayshift's boxes are already weakened significantly.

Enter your device's passcode. Get patching, Cupertino fans, by checking for software updates and installing them. The only way for Apple to now fix this flaw would be to require authentication of all iPhone accessories, but this likely won't happen anytime soon.

Based on Apple's previous update cycles, it is possible that these are the last updates for these operating systems before iOS 12 and its cousins arrive later this year.

Restricted Mode is activated if the iPhone or iPad is left locked for more than hour.

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