Information Disclosure via X-AspNetMvc-Version Header

Description

The 'X-AspNetMvc-Version' header discloses the specific version of ASP.NET MVC that the application is using. Attackers can leverage this information to identify known security flaws, exploit unpatched issues, or tailor automated scanning tools to your environment. This version exposure also aids targeted social engineering, since malicious actors may craft phishing emails or custom exploit payloads referencing the application's MVC framework. Ultimately, revealing ASP.NET MVC version details reduces the application's security through obscurity and can expedite reconnaissance efforts leading to more sophisticated attacks.

Remediation

Disable or remove the 'X-AspNetMvc-Version' header by adjusting your ASP.NET MVC application settings or server configuration. Ensure you are running the latest supported version of ASP.NET MVC, applying all relevant patches and security updates. Consider deploying a Web Application Firewall (WAF) or intrusion detection system to monitor and block attempts exploiting known ASP.NET MVC vulnerabilities. Review your entire response header setup—across load balancers, reverse proxies, or other layers—to ensure that framework version details are not inadvertently leaked. Regular security audits can help verify that no sensitive version information is present in headers, thus minimizing attack vectors.

References

Severity

Owasp

Code: A05:2021

Category: Security Misconfiguration

Classification