testing-for-host-header-injection

# Testing for Host Header Injection ## When to Use - When testing password reset functionality for token theft via host manipulation - During assessment of web caching behavior influenced by Host header values - When testing virtual host routing and server-side request processing - During penetration testing of applications behind reverse proxies or load balancers - When evaluating SSRF potential through Host header manipulation ## Prerequisites - Burp Suite for intercepting and modifying Host headers - Understanding of HTTP Host header role in virtual hosting and routing - Knowledge of alternative host headers (X-Forwarded-Host, X-Host, X-Original-URL) - Access to an attacker-controlled domain for receiving poisoned requests - Burp Collaborator or interact.sh for out-of-band detection - Multiple test accounts for password reset testing > **Legal Notice:** This skill is for authorized security testing and educational purposes only. Unauthorized use against systems you do not own or have written permission to test is illegal and may violate computer fraud laws. ## Workflow ### Step 1 — Test Basic Host Header Injection ```bash # Supply arbitrary Host header curl -H "Host: evil.com" http://target.com/ -v # Check if application reflects evil.com in response # Double Host header curl -H "Host: target.com" -H "Host: evil.com" http://target.com/ -v # Host header with port injection curl -H "Host: target.com:evil.com" http://target.com/ -v curl -H "Host: target.com:@evil.com"...