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Tested successfully on:
On Windows XP SP3 / IE8, heap spray has been avoided because it is stackpivoting to the stack, where the rop chain is stored, so payload has been stored in the stack too. A fresh install of IE8 has been used to exploit. Note that other plugins and/or activex's could do the vulnerable ActiveX to rebase, which would do the exploit to fail. As a sample, while testing, if flashplayer plugin is loaded before the vulnerable activex, the last one is rebased and exploit fails.