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Black Hat Briefings: Firmware is the New Black

 

Firmware is the New Black – Analyzing Past Three Years of BIOS/UEFI Security Vulnerabilities
Bruce Monroe, Rodrigo Branco, Vincent Zimmer

In recent years, we witnessed the rise of firmware-related vulnerabilities, likely a direct result of increasing adoption of exploit mitigations in major/widespread operating systems – including for mobile phones. Pairing that with the recent (and not so recent) leaks of government offensive capabilities abusing supply chains and using physical possession to persist on compromised systems, it is clear that firmware is the new black in security. This research looks into BIOS/UEFI platform firmware, trying to help making sense of the threat. We present a threat model, discuss new mitigations that could have prevented the issues and offer a categorization of bug classes that hopefully will help focusing investments in protecting systems (and finding new vulnerabilities). Our data set comprises of 90+ security vulnerabilities handled by Intel Product Security Incident Response Team (PSIRT) in the past 3 years and the analysis was manually performed, using white-box and counting with feedback from various BIOS developers within the company (and security researchers externally that reported some of the issues – most of the issues were found by internal teams, but PSIRT is involved since they were found to also affect released products).

https://www.blackhat.com/us-17/briefings/schedule/index.html#firmware-is-the-new-black—analyzing-past-three-years-of-biosuefi-security-vulnerabilities-6924

 

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NIST SP 800-193: Platform Firmware Resiliency Guidelines

I thought I got all the appropriate NIST announcements, but missed this, found it in Vincent’s recent blog post:

http://vzimmer.blogspot.com/2017/05/uefi-and-security-postings.html

Very exciting to see this NIST document!

Draft NIST Special Publication 800-193
Platform Firmware Resiliency Guidelines
Andrew Regenscheid

This document provides technical guidelines and recommendations supporting resiliency of platform firmware and data against potentially destructive attacks. The platform is a collection of fundamental hardware and firmware components needed to boot and operate a system. A successful attack on platform firmware could render a system inoperable, perhaps permanently or requiring reprogramming by the original manufacturer, resulting in significant disruptions to users. The technical guidelines in this document promote resiliency in the platform by describing security mechanisms for protecting the platform against unauthorized changes, detecting unauthorized changes that occur, and recovery from attacks rapidly and securely. Implementers, including Original Equipment Manufacturers (OEMs) and component/device suppliers, can use these guidelines to build stronger security mechanisms into platforms. System administrators, security professionals, and users can use this document to guide procurement strategies and priorities for future systems.

http://csrc.nist.gov/publications/PubsDrafts.html#SP-800-193

 

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Vincent on UEFI and free chapter of new Beyond BIOS 3rd edition

Vincent has a multi-topic blog post, including insight on UEFI spec, and pointer to a free chapter of the 3rd edition of Beyond BIOS:

 

http://vzimmer.blogspot.com/2017/02/specifications-and-new-book.html

 

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