Information Disclosure via X-FEServer Header

Description

The 'X-FEServer' header may disclose internal details about the front-end server infrastructure or hosting environment. Attackers can use this information to identify the specific technologies or configurations in place, potentially pinpointing exploitable weaknesses. By revealing server details, malicious actors gain an additional foothold to perform targeted scans, launch tailored attacks, or manipulate load balancing and proxy configurations. Ultimately, disclosing the front-end server name or version expands the application's attack surface and undermines security by disclosing implementation specifics that should remain confidential.

Remediation

Remove or mask the 'X-FEServer' header to avoid revealing sensitive front-end server information. Configure your server, reverse proxy, or load balancer to strip or rewrite headers that expose infrastructure details. Keep front-end server software regularly updated with security patches to reduce the threat of known vulnerabilities. If necessary, deploy a Web Application Firewall (WAF) or intrusion detection system to monitor and block suspicious requests targeting front-end server weaknesses. Regularly audit response headers to ensure that no unintended data leaks about your hosting stack or environment occur in production responses.

References

Severity

Owasp

Code: A05:2021

Category: Security Misconfiguration

Classification