XP SP3 range check hiding an overflow condition?

We have received a few inquiries about the full disclosure posting http://seclists.org/fulldisclosure/2007/Dec/0470.html , where a range check was added in Windows XP SP3 for the Terminal Server RPC function RpcWinStationEnumerateProcesses.  The speculation stated that this change was to hide an overflow condition, potentially leading to an exploitable vulnerability in previous Windows versions.  In reality, this…

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