Apple described the passcode bug and their resolution as follows:
A person with physical access to the device may be able to bypass the screen lock. A logic issue existed in the handling of emergency calls from the lock screen. This issue was addressed through improved lock state management.
In addition to resolving the iOS lockscreen flaw (CVE-2013-0980), this update also fixes vulnerabilities that will prevent the use of the popular jailbreak software evasi0n, which Charlie Miller has predicted will be “the last public jailbreak ever released.”
Congrats to the #evasi0n team!My new prediction is this is the last public jailbreak ever released. — Charlie Miller (@0xcharlie) February 4, 2013
As news broke of the iOS 6.1.3 update, other Twitter users chimed in, too:
IOS 6.1.3 is out.Jailbreakers stay away!There’s no coming back to 6.1.2 JB even if you saved blobs (except iPhone4 and ipt4g)
— MuscleNerd (@MuscleNerd) March 19, 2013
The Evasi0n jailbreak tool became the most popular jailbreak ever with nearly seven million iOS devices hacked just four days removed from of its official release date, according to Forbes. Perhaps with Charlie Miller’s gloomy prediction coupled with huge numbers of iOS users jailbreaking their iPhones, many people may wish to keep their jailbreak and live with the lockscreen flaws.
Updated March 20, 2013 for security contents of iOS 6.1.3
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Following are descriptions of the six iOS vulnerabilities resolved in this update:
Apple iOS users can download and install the 28.5 MB update in iTunes or through your device Settings (select General > Software Update).