Getting into and hijacking the Management Engine means you can take full control of a box, underneath and out of sight of whatever OS, hypervisor or antivirus is installed. This powerful God-mode technology is barely documented and supposedly locked down to prevent miscreants from hijacking and exploiting the engine to silently spy on users or steal corporate data. Positive says it’s found a way to commandeer the Management Engine, which is bad news for organizations with the technology deployed.For some details, we’ll have to wait, but what’s known now is bad enough: Positive has confirmed that recent revisions of Intel’s Management Engine (IME) feature Joint Test Action Group (JTAG) debugging ports that can be reached over USB. JTAG grants you pretty low-level access to code running on a chip, and thus we can now delve into the firmware driving the Management Engine.With knowledge of the firmware internals, security vulnerabilities can be found and potentially remotely exploited at a later date. Alternatively, an attacker can slip into the USB port and meddle the engine as required right there and then.

Source: Intel’s super-secret Management Engine firmware now glimpsed, fingered via USB • The Register