Here's a good article on vulnerabilities in Thunderbolt: http://www.breaknenter.org/2012/02/adventures-with-daisy-in-thunderbolt-dma-land-hacking-macs-through-t

Here's a good article on vulnerabilities in Thunderbolt: http://www.breaknenter.org/2012/02/adventures-with-daisy-in-thunderbolt-dma-land-hacking-macs-through-the-thunderbolt-interface/ http://www.breaknenter.org/2012/02/adventures-with-daisy-in-... Turns out OS X 10.7 and later at least disable DMA access while the computer is locked (unless fast user switching is turned on).