CVE-2021-38751 Explained : Impact and Mitigation

A HTTP Host header attack has been identified in ExponentCMS version 2.6 and below, specifically in the /exponent_constants.php file. This vulnerability allows a malicious actor to manipulate links on a webpage by modifying the HTTP header, potentially creating a security risk for Man-in-the-Middle (MITM) attacks.

Understanding CVE-2021-38751

This section delves into the details of the CVE-2021-38751 vulnerability.

What is CVE-2021-38751?

The CVE-2021-38751 CVE describes a security flaw in ExponentCMS versions 2.6 and earlier, residing in the /exponent_constants.php file. It enables threat actors to alter webpage links through unauthorized manipulation of the HTTP Host header, opening avenues for MITM attacks.

The Impact of CVE-2021-38751

The vulnerability in ExponentCMS version 2.6 and below poses a significant risk as it allows attackers to potentially modify webpage links to lead unsuspecting users to malicious sites, making them vulnerable to various cyber threats.

Technical Details of CVE-2021-38751

This section will provide more insight into the technical aspects of the CVE-2021-38751 vulnerability.

Vulnerability Description

The flaw in ExponentCMS allows attackers to exploit the HTTP Host header to control and modify webpage links, thus undermining the integrity of the website and potentially exposing users to harmful content.

Affected Systems and Versions

ExponentCMS versions 2.6 and earlier are susceptible to this vulnerability, making systems with these versions at risk of exploitation unless appropriate measures are taken.

Exploitation Mechanism

By manipulating the HTTP Host header in /exponent_constants.php, threat actors can intercept and modify webpage links, redirecting users to unsafe websites and creating an opportunity for MITM attacks.

Mitigation and Prevention

To address the CVE-2021-38751 vulnerability, immediate steps must be taken to secure systems and prevent potential exploitation.

Immediate Steps to Take

System administrators should promptly update ExponentCMS to the latest version, apply patches, and monitor for any unauthorized modifications to webpage links that could indicate exploitation attempts.

Long-Term Security Practices

Regular security audits, continuous monitoring for unusual activities, and implementing strict access controls can enhance the overall security posture and help prevent similar vulnerabilities in the future.

Patching and Updates

Staying vigilant for security updates from ExponentCMS, promptly applying patches, and maintaining up-to-date security protocols are crucial in mitigating the risks associated with CVE-2021-38751.