We have lately seen several security flaws when it comes to access of smartphone protected by a secret in code or other means of lock screen protection. No one seems to be immune to software bugs. The iOS bug made it possible to access limited amount of data on a iPhone while the Samsung Android bug would allow the user to gain access to all phone content by completing multiple steps of actions. This week, a Xperia Z owner found a way to bypass the lock screen on his Xperia Z handset.
We have verified that the Xperia T handset also is affected by the bug. Both our Xperia Z and the Xperia T are running Android 4.1.2 Jelly Bean. The instructions on how to bypass the lock screen is simple. Click on the emergency Call button and enter the following code: *#*#7378423*#*#. The number combination 7378423 is the same as "service" on a numeric key pad. Entering this code will open the service menu which is intended for service personnel. Once inside the menu, start the NFC Diag Test and click on the home key. From there, you should have full access to all content on the phone including messages and all apps. The bug will most likely affect all smartphones from Sony running version 4.1.2 of Android. As seen in the video below, Xperia Z and Xperia T are he two phones we have tested. The bug will let anyone with physical access to any of these smartphones to bypass the Face Unlock, Pattern, PIN or Password screen lock settings.