SourceWe found that modern Platform Controller Hub (PCH) and CPU contain a full-fledged logic signal analyzer, which allows monitoring the state of internal lines and buses in real time—a gold mine for researchers. A vulnerability previously discovered by us, INTEL-SA-00086, enabled studying this technology, which is called Intel Visualization of Internal Signals Architecture (VISA). We believe it is used for manufacturing line verification of chips. With an enormous number of settings, VISA allows for the creating of custom rules for capturing and analyzing signals. VISA documentation is subject to an NDA and not available to ordinary users. However, we will show how, with the help of publicly available methods, one can access all the might of this technology WITHOUT ANY HARDWARE MODIFICATIONS on publicly available motherboards.
This ain't over, grinder.