Microsoft Internet Explorer version 8 SetMouseCapture use-after-free exploit.
dc036f7561a91f3ec1de1adb5c4d23b74d6d6af8f98e8f05554baa77eae7a593This Metasploit module exploits a use-after-free vulnerability that targets Internet Explorer 9 on Windows 7. The flaw most likely exists in versions 6/7/8/9/10/11. It was initially found in the wild in Japan, but other regions such as English, Chinese, Korean, etc, were targeted as well. The vulnerability is due to how the mshtml!CDoc::SetMouseCapture function handles a reference during an event. An attacker first can setup two elements, where the second is the child of the first, and then setup a onlosecapture event handler for the parent element. The onlosecapture event seems to require two setCapture() calls to trigger, one for the parent element, one for the child. When the setCapture() call for the child element is called, it finally triggers the event, which allows the attacker to cause an arbitrary memory release using document.write(), which in particular frees up a 0x54-byte memory. The exact size of this memory may differ based on the version of IE. After the free, an invalid reference will still be kept and passed on to more functions, eventually arriving in function MSHTML!CTreeNode::GetInterface, and causing a crash (or arbitrary code execution) when this function attempts to use this reference to call what appears to be a PrivateQueryInterface due to the offset (0x00). To mimic the same exploit found in the wild, this module will try to use the same DLL from Microsoft Office 2007 or 2010 to leverage the attack.
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