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nspace@infosec.exchange

Nspace

Our newest research project is finally public! We can load malicious microcode on Zen1-Zen4 CPUs!
https://github.com/google/security-research/security/advisories/GHSA-4xq7-4mgh-gp6w

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infosecdj@infosec.exchange

DJ🌞donor

Reply to @nspace@infosec.exchange

@nspace Looking great! Any plans for releasing more details?

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nspace@infosec.exchange

Nspace

Reply to @infosecdj@infosec.exchange

@infosecdj yeah! There will be more details in March.

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infosecdj@infosec.exchange

DJ🌞donor

Reply to @nspace@infosec.exchange

@nspace Sweet, looking forward to that.

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pavel

Pavel Machek

Reply to @nspace@infosec.exchange
@nspace Is that an interesting vulnerability? Person with physical access is always able to do such stuff with his hardware... (but maybe not cheaply). Sounds more like a feature :-).
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nspace@infosec.exchange

Nspace

Reply to @pavel

@pavel The threat model for confidential VMs (SEV-SNP etc...) assumes that the owner of the host machine is malicious https://www.amd.com/content/dam/amd/en/documents/epyc-business-docs/white-papers/SEV-SNP-strengthening-vm-isolation-with-integrity-protection-and-more.pdf

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pavel

Pavel Machek

Reply to @nspace@infosec.exchange
@nspace Yes, but we kind off know that protections against malicious owner do not really work, right? Plus it is quite evil to prevent owner of hardware from doing whatever he wants with his own hardware.
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