Zenbleed (CVE-2023-20593)

Let's explore the "most exciting" CPU vulnerability affecting Zen2 CPUs from AMD.
Watch part 1 about fuzzing: https://www.youtube.com/watch?v=neWc0H1k2Lc

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This video is sponsored by Google: https://security.googleblog.com/2023/08/downfall-and-zenbleed-googlers-helping.html

Original Zenbleed Writeup: https://lock.cmpxchg8b.com/zenbleed.html
Grab the code: https://github.com/google/security-research/tree/master/pocs/cpus/zenbleed
cvtsi2ss: https://www.felixcloutier.com/x86/cvtsi2ss.html
AMD Security Bulletin: https://www.amd.com/en/resources/product-security/bulletin/amd-sb-7008.html
RIDL Video: https://www.youtube.com/watch?v=x_R1DeZxGc0
Tavis Ormandy: https://twitter.com/taviso

Chapters:
00:00 - Intro
02:27 - zenleak.asm Patterns
03:56 - The C Exploit Code
05:20 - Assembly Generation with Compiler Preprocessor
07:40 - What are XMM and YMM Registers?
11:56 - Zenbleed: Trigger Merge Optimization
14:28 - Register File & Register Allocation Table
16:39 - Register Renaming
17:55 - Speculative Execution
18:55 - vzeroupper and SSE & AVX History
21:22 - Zenbleed Explanation
23:55 - How to fix Zenbleed?

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Видео Zenbleed (CVE-2023-20593) канала LiveOverflow