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Introduction:
Bug bounty programs offer a legitimate way for security researchers to uncover vulnerabilities and get rewarded. Recently, a researcher shared a “small bounty” win—proof that even modest findings matter. This article breaks down the step‑by‑step process of finding and reporting a simple vulnerability, from setting up your lab to submitting a professional report. Whether you’re aiming for your first bounty or looking to level up, these practical techniques will get you started.
Learning Objectives:
- Understand the bug bounty lifecycle and common vulnerability types.
- Set up a secure penetration testing environment.
- Perform reconnaissance and mapping of a target.
- Identify and exploit a basic Cross‑Site Scripting (XSS) flaw.
- Write a clear, actionable bug report.
You Should Know:
1. Building Your Bug Bounty Lab
Before testing live targets, create an isolated environment to practice tools and techniques.
Linux (Kali or Parrot OS):
- Install VirtualBox or VMware, then download and import a Kali Linux VM.
- Update your system:
sudo apt update && sudo apt upgrade -y
- Install essential tools (many come pre‑installed on Kali):
sudo apt install nmap burpsuite ffuf -y
Windows (if you prefer):
- Use WSL2 for Linux tools, or install native binaries.
- For Burp Suite Community Edition, download from PortSwigger and run the installer.
This lab ensures you can safely test exploits without affecting other systems.
2. Reconnaissance: The Foundation of Every Bounty
Recon (reconnaissance) is the most critical phase. You need to understand the target’s digital footprint.
Using Nmap for network scanning:
nmap -sV -sC target.com
– `-sV` detects service versions.
– `-sC` runs default scripts.
Finding subdomains with `subfinder`:
subfinder -d target.com -o subdomains.txt
Directory brute‑forcing with `ffuf`:
ffuf -u https://target.com/FUZZ -w /usr/share/wordlists/dirb/common.txt
These commands reveal hidden endpoints, outdated services, and potential attack surfaces.
3. Identifying a Simple Vulnerability: Reflected XSS
Cross‑Site Scripting (XSS) remains one of the most common and rewarding beginner bugs. Here’s how to test for it.
Step 1: Locate input fields
- Browse the target site and look for search boxes, comment forms, or URL parameters (e.g.,
?q=test).
Step 2: Inject a test payload
Use a simple JavaScript alert:
<script>alert('XSS')</script>
If you see an alert box pop up, the site is vulnerable.
Step 3: Confirm with Burp Suite
- Intercept the request containing your payload.
- Send it to Repeater and modify the payload to:
<img src=x onerror=alert(1)>
- If the response reflects the payload unsanitized, you’ve found a valid XSS.
This vulnerability can lead to session hijacking or phishing if exploited.
4. Crafting a Proof‑of‑Concept (PoC) and Reporting
A good report includes a clear PoC and impact assessment.
PoC Example:
- Provide the exact URL with the injected payload:
https://target.com/search?q=<script>alert('XSS')</script> - Explain what happens when a victim clicks the link.
Reporting Steps:
1. “Reflected XSS in search parameter ‘q’.”
- Description: “The search parameter does not sanitize user input, allowing arbitrary JavaScript execution.”
3. Steps to Reproduce: Bullet‑point list with screenshots.
- Impact: “An attacker could steal cookies, redirect users, or deface the page.”
- Remediation: “Escape all user input using context‑appropriate encoding.”
Submit via the platform’s responsible disclosure process.
5. Automating Recon with Python
To save time, write a simple Python script to check for common misconfigurations.
import requests
url = "https://target.com"
paths = ["/admin", "/backup", "/.env"]
for path in paths:
full_url = url + path
response = requests.get(full_url)
if response.status_code == 200:
print(f"[+] Found: {full_url}")
else:
print(f"[-] Not found: {full_url}")
This can be extended with threading to scan hundreds of paths quickly.
6. Learning from the Experts: Certifications Matter
Tony Moukbel, a cybersecurity expert with 57 certifications, exemplifies the value of structured learning. While bounties provide hands‑on experience, certifications validate your knowledge.
Recommended Courses:
- eLearnSecurity Junior Penetration Tester (eJPT): Great for beginners.
- Offensive Security Certified Professional (OSCP): Industry standard for pentesters.
- Certified Ethical Hacker (CEH): Broad introduction to ethical hacking.
Combine practical bounty hunting with certification prep to accelerate your career.
7. Advanced Tips: API Security Testing
Many modern applications expose APIs. Misconfigured APIs are a goldmine for bug hunters.
Use Postman to test endpoints:
- Look for IDs in URLs (e.g.,
/api/user/123). Try changing `123` to another number—if you can access another user’s data, you’ve found an Insecure Direct Object Reference (IDOR).
Automated scanning with `ffuf`:
ffuf -u https://target.com/api/v1/user/FUZZ -w ids.txt -fc 404
Always respect scope and rate limits to avoid disrupting services.
What Undercode Say:
- Small bounties build big skills. Every report, even for a low‑severity bug, hones your methodology and communication.
- Continuous learning is non‑negotiable. The cybersecurity landscape evolves daily; certifications and hands‑on practice keep you relevant.
In a field where experience trumps degrees, bug bounties offer a merit‑based path. They teach you to think like an attacker, document like an auditor, and persist like a researcher. Pair this with formal training (like Tony Moukbel’s 57 certifications) to create a formidable profile. Remember: the first bounty is always the hardest—after that, the momentum builds.
Prediction:
As AI tools become integrated into reconnaissance and vulnerability scanning, the barrier to entry for bug hunting will lower. However, human intuition and creativity will remain essential for chaining low‑risk bugs into critical exploits. Expect platforms to introduce AI‑assisted validation, but the core of ethical hacking will stay a human‑driven discipline.
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Reported By: Aditya Singh4180 – Hackers Feeds
Extra Hub: Undercode MoN
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