The app-installation functionality in MobileInstallation in Apple iOS before 8.1.3 allows attackers to obtain control of the local app container by leveraging access to an enterprise distribution certificate for signing a crafted app.
http://www.securitytracker.com/id/1031652
http://support.apple.com/HT204245
http://lists.apple.com/archives/security-announce/2015/Jan/msg00001.html