[1]https://semiaccurate.com/2017/05/01/remote-security-exploit-2008-int
   el-platforms/
   > First a little bit of background. SemiAccurate has known about this
   vulnerability for literally years now, it came up in research we were
   doing on hardware backdoors over five years ago. What we found was
   scary on a level that literally kept us up at night. For obvious
   reasons we couldn’t publish what we found out but we took every
   opportunity to beg anyone who could even tangentially influence the
   right people to do something about this security problem. SemiAccurate
   explained the problem to literally dozens of “right people” to
   seemingly no avail. We also strongly hinted that it existed at every
   chance we had.
   ...
   >  The problem is quite simple, the ME controls the network ports and
   has DMA access to the system. It can arbitrarily read and write to any
   memory or storage on the system, can bypass disk encryption once it is
   unlocked (and possibly if it has not, SemiAccurate hasn’t been able to
   100% verify this capability yet), read and write to the screen, and do
   all of this completely unlogged. Due to the network access abilities,
   it can also send whatever it finds out to wherever it wants, encrypted
   or not.
   keep in mind, just how many computers run Intel. We don't backdoor
   encryption. We backdoor everything.
   We should have adopted the Clipper chip.

References

   1. https://semiaccurate.com/2017/05/01/remote-security-exploit-2008-intel-platforms/