On Sun, Aug 2, 2020 at 3:54 PM Gordon Messmer gordon.messmer@gmail.com wrote:
On 8/2/20 1:19 PM, John Pierce wrote:
One of the things that bugs me about PKI trust chains like this, what happens if the unthinkable happens, and Microsoft's RootCA gets
compromised
and has to be revoked... does that mean every single piece of UEFI hardware out there needs a BIOS upgrade?
Yes. They'll be vulnerable to malware signed by the old CA until they're updated.
That's better than systems without a PKI trust chain, which are vulnerable all of the time.
isn't it more that they simply won't work with newer boots that were signed by the new keys? and the updated BIOS's won't boot older OS versions that weren't signed by the new keys?
BIOS updates are often not available for sligthly older hardware, once it goes out of production most vendors lose all interest.