ClipperCMS 1.3.0: Code Execution
Date: 2015-11-13 11:38:481. 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 |