iOS Lockscreen Bypass Abuses New Group FaceTime Feature
31.10.2019 securityweek Apple
Just hours after Apple announced the availability of a new FaceTime feature in iOS, iPhone enthusiast Jose Rodriguez, known for his YouTube channel videosdebarraquito, found a way to bypass a device’s lockscreen by abusing the newly introduced functionality.
With the release of iOS 12.1, Apple rolled out a new feature called Group FaceTime, which allows users to add other people to their ongoing FaceTime call.
While the feature may be useful for many people, Rodriguez quickly discovered that it can be abused to bypass the passcode on iPhones and gain access to contact information saved on a device.
The hack is easy to carry out and it’s very reliable, unlike other methods discovered by Rodriguez recently, which involved tens of steps and often required multiple attempts to complete.
The attack starts with a phone call to or from the targeted device – Siri can be used to make a phone call to someone in the address book or a specified phone number. If the calling/called device has FaceTime, the hacker can switch the call to FaceTime and then select the “Add Person” option associated with the newly introduced group feature.
The device will prompt the attacker to select someone from the address book. While only contact names are displayed initially, the attacker can use 3D Touch – the feature that allows the device to distinguish between different levels of force being applied to the screen – to obtain additional information for each contact.
In the past years, Rodriguez identified numerous methods to bypass an iPhone’s lockscreen and gain access to contacts and photos stored on a device.
He recently discovered several methods involving Siri and the VoiceOver accessibility feature. Apple has made multiple attempts to patch the bugs after Rodriguez found new variations. The most recent patch came on Tuesday, when Apple released iOS 12.1, but it’s clear that the hacker is very resourceful.
While some of these passcode bypass methods were patched with regular updates, Apple also rolled out iOS updates specifically to address Rodriguez’s hacks.