This Metasploit module exploits a use-after-free vulnerability in Internet Explorer. The vulnerability occurs when an invalid object tag exists and other elements overlap/cover where the object tag should be when rendered (due to their styles/positioning). The mshtml!CObjectElement is then freed from memory because it is invalid. However, the mshtml!CDisplay object for the page continues to keep a reference to the freed <object> and attempts to call a function on it, leading to the use-after-free.
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