Achievo 1.4.2 Shell Upload

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Affected Applications: Confirmed in Achievo 1.4.2. Other versions may also be affected.  
  
Severity: Medium – CVSS: 6.8 (AV:L/AC:L/Au:S/C:C/I:C/A:C)  
  
Vendor Status: New release available (Achievo 1.4.3)  
  
Reference to Vulnerability Disclosure Policy: http://www.cybsec.com/vulnerability_policy.pdf  
  
Vulnerability Description:  
  
The vulnerability is caused due to an improper check in “Document Types” section under Setup menu,  
allowing the upload of files with arbitrary extensions to a folder inside the Webroot. This can be  
exploited to e.g. execute arbitrary PHP code by uploading a specially crafted PHP script containing  
some kind of Web Shell.  
Proof of Concept:  
Select a file with any extension (including PHP) and upload it using the form. The file will be available  
in:  
  
http://server/modules/docmanager/doctypetemplates/myuploadedfile  
  
For example, we can upload “cmd.php” in our instalation in localhost and execute it entering:  
  
  
http://server/achievo-1.4.2/modules/docmanager/doctypetemplates/cmd.php  
  
  
Impact:  
  
Direct execution of arbitrary PHP code in the Web Server.  
  
Solution:  
  
Update the document manager and add a new config (docmanager_allowedfiletypes) for it in  
/configs/docmanager.php.inc. With this config you can tell the docmanager what type of files a user can  
upload.  
  
Vendor Response:  
2009-12-03 – Vulnerability was identified  
2009-12-03 – Vendor contacted  
2009-12-03 – Vendor confirmed vulnerability  
2009-12-03 – Vendor released fixed version  
2009-12-04 – Vulnerability published  
  
Contact Information:  
For more information regarding the vulnerability feel free to contact the researcher at  
ngrisolia <at> cybsec <dot> com  
  
About CYBSEC S.A. Security Systems  
  
Since 1996 CYBSEC S.A. is devoted exclusively to provide professional services specialized in  
Computer Security. More than 150 clients around the globe validate our quality and professionalism.  
To keep objectivity, CYBSEC S.A. does not represent, neither sell, nor is associated with other  
software and/or hardware provider companies.  
Our services are strictly focused on Information Security, protecting our clients from emerging security  
threats, maintaining their IT deployments available, safe, and reliable.  
Beyond professional services, CYBSEC is continuously researching new defense and attack techniques  
and contributing with the security community with high quality information exchange.  
For more information, please visit www.cybsec.com  
(c) 2009 - CYBSEC S.A. Security Systems  
  
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