A report on BoingBoing, authored by Damien Zammit, claims that recent Intel x86 processors have a secret and power control mechanism implemented into them that runs on a separate chip that nobody is allowed to audit or examine. From the report: When these are eventually compromised, they’ll expose all affected systems to nearly unkillable, undetectable rootkit attacks. Further explaining the matter, the author claims that a system with a mainboard and Intel x86 CPU comes with Intel Management Engine (ME) , a subsystem composed of a special 32-bit ARC microprocessor that’s physically located inside the chipset. It is an "extra general purpose computer." The problem resides in the way this "extra-computer" works. It runs completely out-of-band with the main x86 CPU "meaning that it can function totally independently even when your main CPU is in a low power state like S3 (suspend)." On some chipsets, the firmware running on the ME implements a system called Intel’s Active Management Technology (AMT) . This is entirely transparent to the operating system, which means that this extra computer can do its job regardless of which operating system is installed and running on the main CPU. From the report: The purpose of AMT is to provide a way to manage computers remotely (this is similar to an older system called "Intelligent Platform Management Interface" or IPMI, but more powerful). To achieve this task, the ME is capable of accessing any memory region without the main x86 CPU knowing about the existence of these accesses. It also runs a TCP/IP server on your network interface and packets entering and leaving your machine on certain ports bypass any firewall running on your system. Update: 06/15 18:54 GMT by M :A reader points out that this "extra computer" could be there to enable low-power functionalities such as quick boot and quality testing.
Editor’s note: The summary is written with inputs from an anonymous reader, who also shared the story. We’ve been unable to verify the claims made by the author.
转载本站任何文章请注明：转载至神刀安全网，谢谢神刀安全网 » Intel x86s Hide Another CPU That Can Take Over Your Machine — You Can't Audit it