Mass Hunting IDORs on Browser-Based Applications

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Insecure Direct Object Reference (IDOR) vulnerabilities remain a critical issue in web applications, allowing attackers to access unauthorized data by manipulating object references. This article explores methodologies for mass hunting IDORs, particularly in browser-based applications, along with practical commands and techniques.

You Should Know:

1. Understanding IDOR

IDOR occurs when an application exposes internal object references (e.g., user IDs, file paths) without proper authorization checks. Attackers modify these references to access restricted data.

2. Tools for IDOR Hunting

  • Burp Suite (burpsuite) – For intercepting and manipulating requests.
  • OWASP ZAP (owasp-zap) – Automated security testing.
  • curl – For manual HTTP request manipulation.

3. Manual Testing with curl

 Example: Testing user profile access 
curl -X GET "https://example.com/api/user?id=123" -H "Authorization: Bearer <token>"

Modify the ID to test for unauthorized access 
curl -X GET "https://example.com/api/user?id=124" -H "Authorization: Bearer <token>"

4. Automating with Bash

for id in {1..100}; do 
curl -s "https://example.com/api/user?id=$id" -H "Cookie: session=valid_session" | grep "Unauthorized" 
done

5. Burp Suite Intruder for Mass Testing

  1. Capture a request containing an object reference (e.g., user_id=100).

2. Send to Intruder (`Ctrl+I`).

  1. Set payload positions and use Numbers or Simple List for ID brute-forcing.

6. Detecting Blind IDORs

  • Monitor response time differences: 
    time curl -X GET "https://example.com/api/data?id=123"
  • Check for indirect clues (e.g., email leaks in responses).

7. Exploiting IDOR in APIs

  • Test GraphQL endpoints: 
    curl -X POST "https://example.com/graphql" -H "Content-Type: application/json" -d '{"query":"{user(id: 2) {email}}"}'

8. Windows Command for Proxy Testing

Invoke-WebRequest -Uri "https://example.com/profile?id=101" -Proxy "http://127.0.0.1:8080"

9. Prevention Techniques

  • Implement proper access control checks.
  • Use UUIDs instead of sequential IDs.
  • Apply rate limiting to prevent brute-forcing.

What Undercode Say

IDORs are low-hanging fruits but highly impactful. Automation (Bash, Burp) accelerates discovery, while manual testing ensures depth. Always validate indirect object references (e.g., file paths, API keys).

Expected Output:

  • Unauthorized data access via manipulated IDs.
  • 403/401 errors indicating proper access control.
  • Blind IDOR detection via timing analysis.

Prediction

As APIs and microservices grow, IDOR vulnerabilities will shift towards complex indirect references (e.g., JWT tampering, GraphQL field manipulation). Automated scanners will integrate deeper IDOR detection, but manual testing remains key for logic flaws.

Relevant URLs:

IT/Security Reporter URL:

Reported By: Jainireshj Mass – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

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