http://www.pcmag.com/news/349673/5-poisontap-usb-exploit-easily-cracks-sleeping-macs-pcs http://www.bbc.com/news/technology-38012699
In related news, a new tool was released to combat the USB "Rubber Ducky" hacking tools, see link. If I'm correct, HMPA also offers protection against it. https://github.com/JLospinoso/beamgun