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30.
10.
2020
Take A Way - Exploring the Security Implications of AMD's Cache Way Predictors: A
Presentation and Classification
Lennart Mettke
TU Dresden
Hauptseminarvortrag (Online Meeting)
Processors are very complex and their functionality is not openly documented. They
possess many techniques to improve performance and latency. Caches, speculative
execution and branch prediction are prominent examples of such techniques. They
gained a lot of attention in the last few years, as a new class of attacks emerged,
that exploits their behaviour. This new class of attacks is named ?Transient
Execution Attacks? and exploit incorrectly predicted and executed instructions that
lead to the access of secret values. Those attacks are often coupled with cache
side-channel attacks to leak the accessed secret values across security boundaries.
Recently a new paper named ?Take A Way? was released, which leverages the cache way
predictor, used by AMD CPUs, to leak data. In this presentation, I want to give you
an understanding on how and why this new exploit works, how it can be used and
whether it is a new transient execution attack or not.
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