Soham7-dev/AspGoat

SSRF Bypass Challenge

Open

#2 opened on Aug 31, 2025

View on GitHubContributor guide
 (0 comments) (0 reactions) (0 assignees)JavaScript (92 forks)auto 404
bugenhancementhelp wanted

Repository metrics

Stars
 (106 stars)
PR merge metrics
 (PR metrics pending)

Description

🔒 Security Lab Enhancement : SSRF Bypass Challenge

Description

Currently, AspGoat includes one SSRF lab with both:

  • ❌ Vulnerable version
  • ✅ Secure version (with basic whitelist)

However, in real-world scenarios, attackers may find ways to bypass the secure code as well (e.g., via redirects, alternate encodings, or dns rebinding).

Tasks

  • Analyze the current SSRF "secure" implementation via AspGoat UI (Login -> SSRF lab -> Identify Vulnerability -> Secure Code Modal).
  • Copy the Secure Code and replace the Vulnerable Code with the Secure Code inside Controllers/HomeController.cs under SSRF POST ACTION
  • Now try various methods to bypass this protection. (Note: Modifying the /etc/hosts file via RCE or manually to gain access to an internal ip address does not count 😅)

Contributor guide

Research direction
Analyze the secure SSRF code in the application, then try to bypass using techniques like URL manipulation, redirect following, and DNS rebinding. Focus on the whitelist logic and see if you can introduce variations.
Tech stack
csharp
Domain
backendsecurity
Issue type
Security
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Mostly clear
Prerequisites
C#ASP.NET CoreSSRF fundamentals
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
65