Address Book in Apple iOS before 8 relies on the hardware UID for its encryption key, which makes it easier for physically proximate attackers to obtain sensitive information by obtaining this UID.
https://exchange.xforce.ibmcloud.com/vulnerabilities/96084
http://www.securitytracker.com/id/1030866
http://www.securityfocus.com/bid/69932
http://www.securityfocus.com/bid/69882
http://support.apple.com/kb/HT6441
http://archives.neohapsis.com/archives/bugtraq/2014-09/0106.html