That raises questions including the following:
- Does ME in fact extract network credentials from the main OS when latter is running? (IIRC, Snowden indicated the answer is yes - at least in some cases.)
Technically it wouldn't need to since it controls the networking hardware it could set up an ad-hoc wireless network to communicate with other IntelME chips in the local area until it finds one with a wired connection and route traffic through that.