Oops, I missed it again!
Summary: Project Zero researcher Brandon Azad describes missing an out-of-bounds bug in the iOS H11ANEIn driver's H11ANEInDirectPathClient user client, which he had mistakenly explained as Apple intentionally sharing external method tables between two user client classes. The bug was a copy-paste error in the selector bounds check that let the less-privileged client call methods of the more-privileged H11ANEInUserClient and trigger a type confusion on the this pointer; he only recognized it when the iOS 14 beta kernelcache showed the check reduced from 33 to 2.
Bottom line: The bug was reachable from the app sandbox, and the compiler happened to lay the two external method tables back-to-back, which Azad says makes it plausibly exploitable - though he notes he did not examine actual exploitability.
Read the original at Google Project Zero ↗
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- Vulnerabilities & Patching
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