Researchers at Black Hat Asia said that Intel VISA, a testing tool, can be abused using previously-disclosed vulnerabilities in Intel technology. The technology is called Visualization of Internal Signals Architecture (VISA) and is used for manufacturing line-verification of chips. Intel said VISA is disabled by default on commercial systems but the researchers found several ways to activate the technology. VISA exists on the Platform Controller Hub of the motherboard, which is in an Intel family of chipsets used specifically to support Intel CPUs.
Source: https://threatpost.com/undocumented-intel-visa-tech-can-be-abused-researchers-allege/143283/