Host Header Injection

Definitions

1. Host Header Injection is an attack technique in which an adversary supplies a malicious Host header that changes routing, links, or security logic. Defenders analyze it to understand prerequisites, affected trust boundaries, and likely telemetry, then reduce risk with layered controls such as validation, hardening, rate limits, segmentation, and high-quality logging for investigation and response.

   In plain English: Host Header Injection is a way attackers abuse systems or trust relationships, and defenders counter it with better design, validation, monitoring, and layered controls.

   Example: "During the assessment, the team simulated Host Header Injection against a staging service, confirmed the weakness with logs and telemetry, and then added tighter validation, safer defaults, and monitoring so the same technique would trigger an alert in production."

Related Terms

• Adversarial Machine Learning
• Algorithm Downgrade Attack
• Application Security
• Binary Exploitation
• Birthday Attack
• Black Box Testing
• Blind SQL Injection
• Code Injection