Re: Is this an issue for any PC using EFI
The proof-of-concept attack only attacks Macs, but it has never been seen in the wild - it needs the attacker to have physical access to the machine or else use social engineering to trick the user into attacking themselves.
The attack uses Thunderbolt, which is seen comparatively few non-Apple machines - there probably isn't a big enough pool or PC targets for it to worth an attacker's effort. Even on these PCs, "Intel has never allowed [PC] motherboard vendors to hang the Thunderbolt silicon / add-in card off the CPU's PCIe lanes. These have to hang off the platform controller hub (PCH). On the other hand, Apple was allowed to hook up the Thunderbolt silicon directly to the CPU."* so this might prevent a similar attack on generic PCs.
As a PC user, I wish Thunderbolt was more common. The idea of a thin-n-light laptop plugging into an external GPU+monitor is an attractive one for CAD users- but I appreciate it might be a bit niche when USB 3 and ethernet takes care of most users' data transfer needs.