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A kill switch was discovered in the Intel Management Engine (ME) by researchers at Positive Technologies, a cybersecurity vendor. How does the Intel kill switch work? And, given the troubles people have had with Intel ME, is the kill switch a good thing?
Recently, security researchers from Positive Technologies discovered a way to disable the Intel Management Engine that referenced a National Security Agency (NSA) program.
Over the years, the Intel ME has caused controversy while being touted as a backdoor into systems for governments, mainly the NSA. With the finding of the Intel kill switch, many people seemed to take it as a nefarious and secretive method the NSA used to spy on systems. But, before we jump to any conclusions, let's dig deeper into what actually occurred.
First of all, the Intel ME has been considered a security risk and backdoor by many people in the past. These chips have separate CPUs, they can't be disabled out of the box with code that's unaudited and they are used by Active Management Technology (AMT) to remotely manage systems. Likewise, these chips have full access to the TCP/IP stack, the memory, they can be active when the system is hibernating or turned off, and they have dedicated connections to the network interface card.
These facts must be pointed out to make a more logical hypothesis based off of what was found by the researchers. The risk that the Intel ME function could come under attack or have a vulnerability that enabled attackers to access systems directly, without interfacing directly with the OS, is a large concern in general, but especially for government agencies.
By setting and using the undocumented feature in a configuration file, the researchers were able to find a way to turn off the Intel ME function and disable it from being used. This configuration setting was labeled HAP, which stands for High Assurance Platform, and it is a framework developed by the NSA as part of a guide on how to secure computing platforms.
Intel has further confirmed that the HAP switch within the configuration was put there per the request of the U.S. government; however, it was only used in a limited release, and it is not an official part of the supported configuration.
Now, before we get too upset about the NSA, I firmly believe that asking to have the Intel kill switch enabled was a good move. The Intel ME is an accident waiting to happen, and if it can't be disabled by default, then the configuration of this code to kill its function actually helps harden the device's security. I wouldn't be as concerned with the NSA requesting the Intel kill switch, since they're probably trying to harden the U.S. government's system from attack.
Intel and other vendors include config changes like this in their hardware to accommodate the needs of large customers. Overall, this HAP config change simply enables you to harden your system against the use of the Intel ME feature. The blame should land more on Intel for allowing this function in the first place, than on the NSA for looking to remove it.
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