The “Ryzenfall” of AMD
Security research firm CTS has disclosed four critical flaws in AMD’s latest CPU models based on the ZEN architecture: Ryzen and EPYC. Ironically enough the Secure Processor located on the main CPU is the source of the vulnerability. While the firm’s motivation is under some scrutiny due to poor reporting practices, the vulnerabilities appear to be real enough with some terrifying implications. Usually, a compromised machine can be cleaned of the infection and defended again with the appropriate patches or software upgrades. Not anymore. Three of the flaws, dubbed Ryzenfall, Fallout, and Masterkey, allow an attacker to plant malware in a “secure enclave” thereby skipping all detection and other security controls such as Microsoft’s Credential Guard, Virtualization based Security, and AMD’s own firmware Trusted Platform Module (fTPM), or they can just brick your motherboard. The flaws use the fact that the BIOS validation program can be tricked into believing a…