The MPC::HexToNum function in helpctr.exe in Microsoft Windows Help
and Support Center in Windows XP and Windows Server 2003 does not
properly handle malformed escape sequences, which allows remote
attackers to bypass the trusted documents whitelist (fromHCP option)
and execute arbitrary commands via a crafted hcp:// URL, aka "Help
Center URL Validation Vulnerability."
Note:References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
BUGTRAQ:20100609 Microsoft Windows Help Centre Handles Malformed Escape Sequences Incorrectly
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