CVE-2020-10212 : Vulnerability Insights and Analysis

Responsive FileManager versions 9.13.4 and 9.14.0 are vulnerable to SSRF attacks due to mishandling of file-extension blocking and DNS resolution issues. Attackers can exploit this to perform SSRF attacks by manipulating the URL parameter.

Understanding CVE-2020-10212

This CVE identifies a security vulnerability in Responsive FileManager versions 9.13.4 and 9.14.0 that allows Server-Side Request Forgery (SSRF) attacks.

What is CVE-2020-10212?

CVE-2020-10212 is a vulnerability in upload.php in Responsive FileManager 9.13.4 and 9.14.0 that enables SSRF attacks through the URL parameter. The issue arises from improper handling of file-extension blocking and the ability of DNS hostnames to resolve to internal IP addresses.

The Impact of CVE-2020-10212

The vulnerability allows attackers to conduct SSRF attacks, potentially leading to unauthorized access to internal systems, data exfiltration, or further network compromise.

Technical Details of CVE-2020-10212

Responsive FileManager's vulnerability to SSRF attacks can be further understood through the following technical details:

Vulnerability Description

The flaw in upload.php allows SSRF via the URL parameter due to mishandling of file-extension blocking and DNS hostname resolution, enabling attackers to manipulate requests to internal resources.

Affected Systems and Versions

Responsive FileManager versions 9.13.4 and 9.14.0

Exploitation Mechanism

Attackers can exploit the SSRF vulnerability by adding a .ico filename to the PATH_INFO, allowing them to manipulate requests to internal IP addresses.
DNS hostname manipulation can also be used for DNS pinning attacks.

Mitigation and Prevention

To address CVE-2020-10212 and enhance security measures, consider the following steps:

Immediate Steps to Take

Update Responsive FileManager to the latest patched version.
Implement strict input validation to prevent malicious URL manipulation.

Long-Term Security Practices

Conduct regular security assessments and penetration testing to identify vulnerabilities.
Educate developers and administrators on secure coding practices and SSRF prevention.

Patching and Updates

Regularly monitor for security advisories and apply patches promptly to mitigate known vulnerabilities.