Rosenbridge – Hardware Backdoors In Some X86 CPUs

project:rosenbridge reveals a hardware backdoor in some desktop, laptop, and embedded x86 processors. The backdoor allows ring 3 (userland) code to circumvent processor protections to freely read and write ring 0 (kernel) data. While the backdoor is typically disabled (requiring ring 0 execution to enable it), we have found that it is enabled by default […]