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Communication Dans Un Congrès Année : 2012

Hardware Backdooring is Practical

Jonathan Brossard

Résumé

This presentation will demonstrate that permanent backdooring of hardware is practical. We have built a generic proof of concept malware for the intel architecture, Rakshasa, capable of infecting more than a hundred of different motherboards. The first net effect of Rakshasa is to disable NX permanently and remove SMM related fixes from the BIOS, resulting in permanent lowering of the security of the backdoored computer, even after complete erasing of hard disks and reinstallations of a new operating system. We shall also demonstrate that pre-existing work on MBR subversions such as bootkiting and preboot authentication software brute force can be embedded in Rakshasa with little effort. More over, Rakshasa is built on top of free software, including the Coreboot project, meaning that most of its source code is already public. This presentation will take a deep dive into Coreboot and hardware components such as the BIOS, CMOS and PIC embedded on the motherboard, before detailing the inner workings of Rakshasa and demo its capabilities. It is hoped to raise awareness of the security community regarding the dangers associated with non open source firmware shipped with any computer and question their integrity. This shall also result in upgrading the best practices for forensics and post intrusion analysis by including the afore mentioned firmware as part of their scope of work.
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hal-04606160 , version 1 (09-06-2024)

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  • HAL Id : hal-04606160 , version 1

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Jonathan Brossard. Hardware Backdooring is Practical. Blackhat USA, Blackhat, Jul 2012, Las Vegas, United States. ⟨hal-04606160⟩
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