AMD PSP vuln: fTPM remote code execution

Busy year for processor security so far…

http://seclists.org/fulldisclosure/2018/Jan/12

AMD-PSP: fTPM Remote Code Execution via crafted EK certificate

From: Cfir Cohen via Fulldisclosure <fulldisclosure () seclists org>
Date: Wed, 3 Jan 2018 09:40:40 -0800

AMD PSP is a dedicated security processor built onto the main CPU die. ARM TrustZone provides an isolated execution environment for sensitive and privileged tasks, such as main x86 core startup. [..] The fTPM trustlet code was found in Coreboot’s git repository [5] and in several BIOS update files. […] This research focused on vendor specific code that diverged from the TCG spec. […] As far as we know, general exploit mitigation technologies (stack cookies, NX stack, ASLR) are not implemented in the PSP environment. […] Credits: This vulnerability was discovered and reported to AMD by Cfir Cohen of the Google Cloud Security Team.

Timeline
========
09-28-17 – Vulnerability reported to AMD Security Team.
12-07-17 – Fix is ready. Vendor works on a rollout to affected partners.
01-03-18 – Public disclosure due to 90 day disclosure deadline.

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