server-side

Tests websites for security weaknesses that hackers could exploit on the server side.

Installation

Run `npx skills add "https://github.com/transilienceai/communitytools" --skill "server-side"` to install this skill, then follow its SKILL.md instructions for my next request.

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SKILL.mdShow the author's original SKILL.md

---
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

Ships with 49 supporting files:

reference/file-upload-resources.md
reference/http-host-header-resources.md
reference/http-request-smuggling-resources.md
reference/INDEX.md
reference/insecure-deserialization-resources.md
reference/protocol-coercion.md
reference/scenarios/deserialization/dotnet-deserialization.md
reference/scenarios/deserialization/java-deserialization.md
reference/scenarios/deserialization/nodejs-deserialization.md
reference/scenarios/deserialization/php-deserialization.md
reference/scenarios/deserialization/python-and-ruby.md
reference/scenarios/deserialization/react-server-components-flight.md
reference/scenarios/deserialization/tools/aspnet_viewstate_build.py
reference/scenarios/file-upload/content-type-and-magic-bytes.md
reference/scenarios/file-upload/defense-evasion-and-yara.md
reference/scenarios/file-upload/extension-bypass.md
reference/scenarios/file-upload/ntfs-junction-write-redirect.md
reference/scenarios/file-upload/ntlm-hash-leak-via-media-upload.md
reference/scenarios/file-upload/path-traversal-and-htaccess.md
reference/scenarios/file-upload/polyglot-and-metadata-injection.md
… and 29 more

Mirrored from the author's public source. Install counts from the open skills registry.