/server-side

name: server-side
description: Server-side vulnerability testing - SSRF, HTTP Request Smuggling, Path Traversal, File Upload, Insecure Deserialization, and Host Header injection.

Server-Side

Test for server-side vulnerabilities that allow unauthorized access, RCE, or data exfiltration.

Techniques

| Type | Key Vectors | |------|-------------| | **SSRF** | Internal service access, cloud metadata, protocol smuggling | | **HTTP Smuggling** | CL.TE, TE.CL, TE.TE, CL.0, H2.CL, h2c, multi-layer proxy chains, connection pooling desync | | **Path Traversal** | Directory traversal, null bytes, encoding bypass | | **File Upload** | Extension bypass, content-type manipulation, polyglot files | | **Deserialization** | Java, PHP, Python, .NET gadget chains | | **Host Header** | Password reset poisoning, cache poisoning, routing-based SSRF | | **CUPS / cups-browsed** | CVE-2024-47076/47175/47176/47177 — UDP browse → IPP injection → PPD injection → foomatic-rip RCE (see `skills/infrastructure/reference/scenarios/network-recon/cups-browsed-rce.md`) |

Workflow

1. Identify server-side processing points 2. Test for vulnerability class indicators 3. Bypass protections (WAF, allowlists, encoding filters) 4. Demonstrate impact (file read, RCE, internal access) 5. Capture evidence with PoC

Reference

• `reference/scenarios/ssrf/*.md` - SSRF techniques and labs
• `reference/http-request-smuggling*.md` - Smuggling techniques
• `reference/scenarios/path-traversal/*.md` - Path traversal bypass methods
• `reference/file-upload*.md` - File upload exploitation
• `reference/insecure-deserialization*.md` - Deserialization attacks
• `reference/http-host-header*.md` - Host header injection
• `skills/infrastructure/reference/scenarios/network-recon/cups-browsed-rce.md` - CUPS RCE chain (CVE-2024-47076/175/176/177); ipptool false positives vs libcups runtime parser; ippserver Python lib version-1.1 hardcode bug