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Encryption-breaking, password-leaking bug in many AMD CPUs could take months to fix(arstechnica.com)

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evatronic@lemm.ee
45 points

It’s worth noting these are the firmware / microcode fixes.

There’s already a software solution available,

There is a software workaround, you can set the chicken bit DE_CFG[9]. This may have some performance cost, and the microcode update is preferred.

source: https://www.openwall.com/lists/oss-security/2023/07/24/3

AMD has also already released a fix for the big boy - the EPYC processor.

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Dr. Dabbles@lemmy.world
1 point

The MSR bit is potentially a large performance loss and AMD recommends their partners not use it. In my tests is was 5-15% on EPYC depending on workload. “Some performance cost” is really hiding the reality of that bit.

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