Responsive Filemanager · Responsive Filemanager · CVE-2020-10212
**Name of the Vulnerable Software and Affected Versions**
Responsive FileManager versions 9.13.4 through 9.14.0
**Description**
The issue allows for Server-Side Request Forgery (SSRF) via the `url` parameter in the upload.php file. This is due to mishandled file-extension blocking and the possibility of a DNS hostname resolving to an internal IP address. For example, adding a .ico filename to the PATH INFO can lead to a successful SSRF attempt. An attacker could also create a DNS hostname that resolves to the 0.0.0.0 IP address for DNS pinning.
**Recommendations**
For Responsive FileManager versions 9.13.4 through 9.14.0, consider disabling the upload.php file or restricting access to it until a proper fix is applied. Avoid using the `url` parameter in the upload.php file to minimize the risk of exploitation. As a temporary workaround, restrict the handling of file extensions and DNS hostnames to prevent SSRF attempts.