Positive Technologies plans to demonstrate at the next Black Hat conference how to hack over USB into Intel Management Engine of most CPUs since 2008. The God-mode hack could be exploited by an attacker of the machine to run unsigned code in the Platform Controller Hub on any motherboard The vulnerability affects Intels Management Engine technologies such as Active Management Technology (AMT), Small Business Technology (SBT), and Intel Standard Manageability (ISM) The remote management features allow system administrators to remotely manage computers over an enterprise network. This vulnerability does not exist on Intel-based consumer PCs.”]
Source: http://securityaffairs.co/wordpress/65327/hacking/intel-management-engine-flaw-hack.html