Hunt Http Smuggling
Hunt HTTP request smuggling (CL.TE, TE.CL, H2.CL, H2.TE).
Install
npx skills add elementalsouls/Claude-BugHunter --skill hunt-http-smuggling -g -a claude-code -y- Repository
- elementalsouls/Claude-BugHunter5.4k
- Category
- Design
- Updated
- 3d ago
- License
- MIT
- Context cost
- Mediumabout 1,555 tokens
- Runs scripts
- No, instructions only
What it does
Hunt HTTP request smuggling (CL.TE, TE.CL, H2.CL, H2.TE). Cause: front-end proxy and back-end server disagree on where one request ends and the next begins (Content-Length vs Transfer-Encoding header parsing inconsistency). CL.TE: front-end uses CL, back uses TE → smuggle by sending TE: chunked but with body that fits CL count. TE.CL: opposite. H2.CL: HTTP/2 downgrade, smuggle CL into HTTP/1.1 back-end. Detection tools: Burp HTTP Request Smuggler extension, smuggler.py, h2csmuggler. Confirm: time-delay technique (smuggled GET with 30s timeout), if front-end returns slow on next victim request, smuggling works. Validate: cache poisoning chain (smuggle request that gets cached for victim), credential theft (smuggle X-Forwarded-For override that captures next user's cookies), bypass auth (smuggled internal-path request). Real paid examples from major CDN deployments. Use when hunting H1 paid programs running CDN+origin stacks, when targeting load balancer / WAF bypass.
17. HTTP REQUEST SMUGGLING
Lowest dup rate. $5K, $30K. PortSwigger research by James Kettle.
CL.TE (Content-Length front, Transfer-Encoding back)
POST / HTTP/1.1
Content-Length: 13
Transfer-Encoding: chunked
0
SMUGGLED
Detection
1. Burp extension: HTTP Request Smuggler
2. Right-click request → Extensions → HTTP Request Smuggler → Smuggle probe
3. Manual timing: CL.TE probe + ~10s delay = backend waiting for rest of body
Impact Chain
Poison next request → access admin as victim
Steal credentials → capture victim's session
Cache poisoning → stored XSS at scale
Target-Suitability Matrix (2026 reality check)
The classic CL.TE / TE.CL payloads are NOT universally exploitable in 2026. Modern proxies are RFC 9112 strict by default. Fingerprint the front-end BEFORE investing time.
