CVE-2020-13485 : What You Need to Know

Craft CMS Knock Knock Plugin Vulnerability

Understanding CVE-2020-13485

Craft CMS Knock Knock plugin before version 1.2.8 is susceptible to an IP Whitelist bypass via an X-Forwarded-For HTTP header.

What is CVE-2020-13485?

The vulnerability in the Knock Knock plugin for Craft CMS allows attackers to bypass IP Whitelists by manipulating the X-Forwarded-For HTTP header.

The Impact of CVE-2020-13485

This vulnerability could enable unauthorized access to restricted areas or resources within the Craft CMS system, compromising its security.

Technical Details of CVE-2020-13485

Craft CMS Knock Knock Plugin Vulnerability Details

Vulnerability Description

The issue lies in the plugin's failure to properly validate the X-Forwarded-For header, allowing attackers to spoof IP addresses and bypass IP Whitelists.

Affected Systems and Versions

Product: Craft CMS Knock Knock Plugin
Vendor: N/A
Versions Affected: Before 1.2.8

Exploitation Mechanism

Attackers can exploit this vulnerability by sending crafted HTTP requests with a manipulated X-Forwarded-For header to deceive the system into granting unauthorized access.

Mitigation and Prevention

Protecting Against CVE-2020-13485

Immediate Steps to Take

Update the Craft CMS Knock Knock plugin to version 1.2.8 or later to mitigate the vulnerability.
Monitor network traffic for any suspicious activity related to IP Whitelist bypass attempts.

Long-Term Security Practices

Implement strict input validation mechanisms to prevent header manipulation attacks.
Regularly review and update security configurations to address emerging threats.

Patching and Updates

Stay informed about security advisories and promptly apply patches released by the plugin vendor to address known vulnerabilities.