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Microarchitectural Data Sampling (MDS) is a set of hardware vulnerabilitiesin Intel CPUs that allows an attacker to leak bytes of data from memory loadsand stores across various security boundaries. On affected CPUs, some of thesevulnerabilities were patched via microcode updates. Additionally, Intelannounced that the newest microarchitectures, namely Cascade Lake and Ice Lake,were not affected by MDS. While Cascade Lake turned out to be vulnerable to theZombieLoad v2 MDS attack (also known as TAA), Ice Lake was not affected by thisattack.  In this technical report, we show a variant of MSBDS (CVE2018-12126), an MDSattack, also known as Fallout, that works on Ice Lake CPUs. This variant wasautomatically synthesized using Transynther, a tool to find new variants ofMeltdown-type attacks. Based on the findings of Transynther, we analyzedifferent microcodes regarding this issue, showing that only microcode versionsafter January 2020 prevent exploitation of the vulnerability. These resultsshow that Transynther is a valuable tool to find new variants, and also to testfor regressions possibly introduced with microcode updates.

Data Sampling on MDS-resistant 10th Generation Intel Core (Ice Lake)