The Accounts subsystem in Apple iOS before 8 allows attackers to bypass a sandbox protection mechanism and obtain an active iCloud account's Apple ID and metadata via a crafted application.
https://exchange.xforce.ibmcloud.com/vulnerabilities/96099
http://www.securitytracker.com/id/1030866
http://www.securityfocus.com/bid/69917
http://www.securityfocus.com/bid/69882
http://support.apple.com/kb/HT6441
http://archives.neohapsis.com/archives/bugtraq/2014-09/0106.html