This article, originally posted by the British publication The Register, highlights a vulnerability that was recently made public by a researcher that would allow an unauthorized user to gain access to the address book of any device using the iOS operating system. The publication and video that is included demonstrate how this exploit is replicated, albeit in a surprisingly simple way. All it requires is that someone calls the iOS device and opts to reply with a text message, thereby bypassing the lock screen and bringing you directly into the device’s address book. While the respond with a text feature can be disabled by delving through long list of sometimes complicated settings, this exploitable feature is always enabled automatically on all iOS devices. Being the owner of not one, but three apple products that use Apple’s iOS operating system, I am less than thrilled at the discovery of such a surface level GUI vulnerability. Thankfully, the article follows up by notifying people of a fix coming within the next two weeks that would remove this particular vulnerability permanently.
Source: https://apple.slashdot.org/story/19/09/15/004237/ios-13-lock-screen-lets-anyone-see-your-address-book