Trashing the Flow of Data
Summary: Project Zero disclosed crbug.com/944062, a TurboFan vulnerability in Chrome's JavaScript compiler found independently by Samuel (saelo@) via fuzzing with fuzzilli and by Stephen Röttger via manual code auditing, fixed in beta before reaching stable Chrome. The bug was in JSCallReducer::ReduceArrayIndexOfIncludes, which optimized Array.prototype.indexOf using inferred receiver maps without runtime checks when those maps were marked unreliable, allowing an elements-kind confusion from float to dictionary that produced an out-of-bounds read.
What you should know: The out-of-bounds read was escalated into an arbitrary write by abusing the garbage collector's marking phase, letting an attacker set a bit at any chosen address - and the bug was caught only because two researchers found it independently before it shipped to stable.
Read the original at Google Project Zero ↗
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