Microsoft Internet Explorer IESetProtectedModeRegKeyOnly Protected Mode Escape Exploit (MS13-097)

The IESetProtectedModeRegKeyOnly() function in the ieframe.dll library of Microsoft Internet Explorer calls the RegCreateKeyEx registry function when running with Medium Integrity Level over a registry key that is writable by a sandboxed IE instance. This can be abused to overwrite IE's Elevation Policy by creating symbolic links in the Windows Registry in order to escape from the Internet Explorer Protected Mode sandbox. This module allows an agent running in the context of iexplore.exe with Low Integrity Level/AppContainer Integrity Level to escalate privileges in order to install a new agent that will run with Medium Integrity Level.
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Friday, August 22, 2014 - 00:00