How to Find Critical Vulnerabilities in Bug Bounty Programs

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Bug bounty hunting is a lucrative and challenging field that requires consistency, skill, and deep knowledge of web security vulnerabilities. Security researchers like Yusuf Nas have demonstrated success by uncovering critical flaws such as Improper Authentication leading to unauthorized access, which scored a 9.8 CVSS severity and earned an $800 bounty.

You Should Know:

1. Improper Authentication Exploitation

Improper Authentication occurs when an application fails to verify user identity correctly, allowing attackers to bypass security controls. Here’s how you can test for it:

Steps to Reproduce:

  1. Intercept the Request: Use Burp Suite or OWASP ZAP to capture login requests.
  2. Modify Authentication Tokens: Change session cookies or API keys to see if access is granted without proper validation.
  3. Test for IDOR (Insecure Direct Object Reference): Manipulate user IDs in URLs (e.g., `user_id=123` → user_id=124).

Example Exploit Code (Python):

import requests

target_url = "https://example.com/admin" 
session_cookie = "stolen_or_modified_cookie=123abc"

headers = {"Cookie": session_cookie} 
response = requests.get(target_url, headers=headers)

if "Admin Panel" in response.text: 
print("[+] Unauthorized Access Successful!") 
else: 
print("[-] Access Denied")

2. Linux Commands for Bug Hunting

  • Curl for Testing Endpoints:
    curl -H "Authorization: Bearer FAKE_TOKEN" https://api.target.com/user/data
  • Grep for Sensitive Data:
    cat response.txt | grep -i "password|admin|token"

3. Windows Command for Security Testing

  • Check Open Ports (PowerShell):
    Test-NetConnection -ComputerName target.com -Port 443

What Undercode Say:

Bug bounty hunting is not just about finding flaws but understanding how systems fail. Always:
– Use automated scanners (Burp, Nikto) alongside manual testing.
– Document every step for clear vulnerability reports.
– Follow responsible disclosure to avoid legal issues.

Expected Output:

A well-structured bug report with:

  • Vulnerability
  • Steps to Reproduce
  • Impact Analysis
  • Proof of Concept (PoC) Code
  • Suggested Fixes

For further reading, visit:

( expanded with practical commands, code snippets, and actionable steps for bug hunters.)

References:

Reported By: Yusufnass Bugbounter – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

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