ClipperCMS 1.3.0 Shell Upload

`Security Advisory - Curesec Research Team  
  
1. Introduction  
  
Affected Product: ClipperCMS 1.3.0  
Fixed in: not fixed  
Fixed Version Link: n/a  
Vendor Website: http://www.clippercms.com/  
Vulnerability Type: Code Execution  
Remote Exploitable: Yes  
Reported to vendor: 10/02/2015  
Disclosed to public: 11/13/2015  
Release mode: Full Disclosure  
CVE: n/a  
Credits Tim Coen of Curesec GmbH  
  
2. Vulnerability Description  
  
CVSS  
  
High 9.0 AV:N/AC:L/Au:S/C:C/I:C/A:C  
  
Description  
  
The file upload uses a whitelist to only allow non-dangerous file extensions.  
However, it does allow the upload of .htaccess files, which means that an  
attacker can upload files with any extension and still gain code execution.  
  
An account is required to upload files. The role the account is in needs the  
right to upload files. By default, the lowest user role - Editor - has this  
right.  
  
3. Proof of Concept  
  
  
The file upload can be found here:  
http://localhost/ClipperCMS-clipper_1.3.0/manager/index.php?a=31  
  
To gain code execution, upload a .htaccess file with the content:  
AddType application/x-httpd-php .png  
  
Now, any uploaded file containing PHP code with the extension .png will be executed.  
  
3. Solution  
  
This issue has not been fixed by the vendor.  
  
4. Report Timeline  
  
10/02/2015 Informed Vendor about Issue (no reply)  
10/21/2015 Reminded Vendor of Disclosure Date (no reply)  
11/13/2015 Disclosed to public  
  
  
Blog Reference:  
http://blog.curesec.com/article/blog/ClipperCMS-130-Code-Execution-95.html  
  
  
`