The Sandbox Profiles component in Apple iOS before 8.3 and Apple TV before 7.2 allows attackers to discover hardware identifiers via a crafted app.
http://lists.apple.com/archives/security-announce/2015/Apr/msg00002.html
http://lists.apple.com/archives/security-announce/2015/Apr/msg00003.html
http://www.securityfocus.com/bid/73983
http://www.securitytracker.com/id/1032050