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Introduction:
Bug bounty hunting is a lucrative yet challenging field that requires structured learning, hands-on practice, and a deep understanding of web vulnerabilities. Many beginners waste time chasing random exploits without a clear methodology. This guide outlines a proven approach to mastering bug bounty hunting, from foundational knowledge to advanced exploitation techniques.
Learning Objectives:
- Understand core web application concepts (HTTP, authentication, sessions).
- Master one vulnerability at a time (e.g., IDOR, XSS, SQLi).
- Learn how to use tools effectively instead of relying on automation.
- Develop a structured methodology for vulnerability hunting.
- Engage in CTFs and real-world bug bounty programs.
You Should Know:
1. Understanding HTTP Basics
Command:
curl -X GET "https://example.com/api/data?id=1" -H "Cookie: session=abc123"
What It Does:
This `curl` command sends a GET request to `example.com` with a session cookie. Understanding HTTP methods (GET, POST, PUT, DELETE) is crucial for manipulating web requests during testing.
Step-by-Step Guide:
- Use `curl` or Burp Suite to inspect requests.
- Modify parameters (
id=1→id=2) to test for IDOR (Insecure Direct Object Reference).
3. Check if changing cookies grants unauthorized access.
2. Finding IDOR Vulnerabilities
Command:
ffuf -u "https://target.com/api/user/FUZZ" -w wordlist.txt -fs 0
What It Does:
`Ffuf` is a fast web fuzzer. Here, it tests for user IDs (e.g., /user/1, /user/2) to find exposed data.
Step-by-Step Guide:
1. Enumerate API endpoints with `ffuf`.
2. Test sequential IDs (`/user/1` → `/user/2`).
- If you access another user’s data, you’ve found an IDOR.
3. Subdomain Enumeration with Subfinder
Command:
subfinder -d example.com -o subdomains.txt
What It Does:
`Subfinder` discovers subdomains, expanding the attack surface.
Step-by-Step Guide:
1. Run `subfinder` to list subdomains.
2. Use `httpx` to check live hosts:
cat subdomains.txt | httpx -silent
3. Scan for vulnerabilities with `nuclei`.
4. Detecting XSS with Manual Testing
Payload:
<script>alert(1)</script>
What It Does:
Tests for Cross-Site Scripting (XSS) by injecting JavaScript.
Step-by-Step Guide:
1. Find input fields (search, forms).
2. Insert the payload.
- If an alert pops up, the site is vulnerable.
5. SQL Injection with SQLmap
Command:
sqlmap -u "https://example.com/search?query=1" --dbs
What It Does:
`SQLmap` automates SQL injection testing.
Step-by-Step Guide:
1. Identify a parameter (`query=1`).
2. Run `sqlmap` to extract database names (`–dbs`).
3. Use `–dump` to retrieve table data.
6. Using Burp Suite for Session Hijacking
Steps:
1. Intercept a login request in Burp Proxy.
2. Modify the `session` cookie in Repeater.
- If you gain access, the app has session fixation.
7. Automating Scans with Nuclei
Command:
nuclei -u https://example.com -t cves/
What It Does:
`Nuclei` scans for known vulnerabilities.
Step-by-Step Guide:
1. Run `nuclei` with templates (`-t cves/`).
2. Review findings for exploitable flaws.
What Undercode Say:
- Key Takeaway 1: Methodology beats automation—understanding how vulnerabilities work is more valuable than blindly running tools.
- Key Takeaway 2: Start with one bug type (e.g., IDOR) before moving to complex exploits.
Analysis:
Many beginners fail because they lack focus. By mastering fundamentals (HTTP, cookies, sessions) and systematically hunting for one vulnerability at a time, success becomes repeatable. Tools like curl, ffuf, and `Burp Suite` are powerful, but only when used with intent.
Prediction:
As web applications grow more complex, bug bounty programs will demand deeper expertise. Hunters who invest in structured learning (CTFs, disclosed reports) will outperform those relying on luck. The future of bug bounties belongs to those who think like hackers, not script runners.
Follow Bhavesh Pardhi for more insights:
BugBounty EthicalHacking Cybersecurity
IT/Security Reporter URL:
Reported By: Bhavesh – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
