Vulnerability Lab has discovered a second iOS 6.1 vulnerability that lets a hacker slip past a lock screen to access a users contact list, voicemails and more. Both attacks require using the Emergency Call function in addition to the lock/sleep button and the screenshot feature. Apple has said a fix is in the works, though a spokesperson didnt say when that would come. The vulnerability is located in the main login module of the mobile iOS device (iphone or ipad) when processing to use the screenshot function in combination with the emegerncy call and power.”]
Source: https://nakedsecurity.sophos.com/2013/02/27/second-iphone-passcode-hack-vulnerability-discovered/