The Profiles component in Apple iOS before 9.3 does not properly validate certificates, which allows attackers to spoof an MDM profile trust relationship via unspecified vectors.
https://support.apple.com/HT206166
http://www.zerodayinitiative.com/advisories/ZDI-16-314
http://www.securitytracker.com/id/1035353
http://lists.apple.com/archives/security-announce/2016/Mar/msg00000.html