HTTP Smuggling

HTTP Smuggling: A Trust Crisis Triggered by ‘Parsing Differences’

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Introduction: The Invisible “Layer” In modern web architecture, an HTTP request from a user often passes through multiple checkpoints before reaching the actual business logic (backend server): CDN, load balancer, WAF, reverse proxy… We can imagine this model as a tightly secured building: Frontend Proxy (e.g., Nginx, CDN): This is your building’s “security guard”. He … Read more

New HTTP Smuggling Attack Technique Allows Attackers to Inject Malicious Requests

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New HTTP Smuggling Attack Technique Allows Attackers to Inject Malicious Requests

Overview of Attack Principles This complex HTTP request smuggling attack exploits the differences in parsing behavior between front-end proxy servers and back-end application servers. The new technique uses malformed chunked transfer encoding to bypass existing security controls and inject unauthorized secondary requests into web applications. Key Points Exploiting malformed HTTP chunked encoding to create parsing … Read more

HTTP Smuggling: Understanding the Attack Techniques and Detection Methods

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HTTP Smuggling: Understanding the Attack Techniques and Detection Methods

Question: Is HTTP smuggling only applicable to HTTP and not HTTPS? HTTP smuggling is not limited to HTTP; it can also be applied to HTTPS. HTTP smuggling is an attack technique that exploits the differences in how front-end servers and back-end servers parse HTTP requests. By cleverly constructing requests, attackers can confuse the server when … Read more