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Introduction:
Bug bounty hunting is a critical skill in cybersecurity, enabling researchers to identify vulnerabilities before malicious actors exploit them. This guide covers essential techniques, tools, and commands to help you excel in bug bounty programs, web app pentesting, and vulnerability assessment.
Learning Objectives:
- Understand core bug bounty methodologies and reconnaissance techniques.
- Master Linux and Windows commands for vulnerability detection and exploitation.
- Learn secure coding practices and mitigation strategies for common vulnerabilities.
You Should Know:
1. Reconnaissance with Subdomain Enumeration
Command:
subfinder -d example.com -o subdomains.txt
What it does:
Subfinder is a fast subdomain discovery tool that queries multiple sources (DNS, APIs, search engines) to enumerate subdomains.
Step-by-Step Guide:
1. Install Subfinder:
go install -v github.com/projectdiscovery/subfinder/v2/cmd/subfinder@latest
2. Run the scan:
subfinder -d example.com -o subdomains.txt
3. Analyze results for hidden entry points vulnerable to attacks.
2. Detecting SQL Injection Vulnerabilities
Command (SQLmap):
sqlmap -u "http://example.com/login?id=1" --dbs
What it does:
SQLmap automates SQL injection detection and exploitation, extracting database information.
Step-by-Step Guide:
1. Install SQLmap:
git clone --depth 1 https://github.com/sqlmapproject/sqlmap.git
2. Test a URL for SQLi:
sqlmap -u "http://example.com/login?id=1" --dbs
3. Use `–dump` to extract table data if vulnerable.
3. Exploiting XSS with Payload Crafting
Payload Example:
<script>alert(document.cookie)</script>
What it does:
Tests for Cross-Site Scripting (XSS) vulnerabilities by injecting malicious scripts.
Step-by-Step Guide:
1. Identify input fields (search bars, forms).
- Inject the payload and check for script execution.
- Use BeEF (Browser Exploitation Framework) for advanced exploitation.
4. Hardening Web Servers with Nginx/Apache
Nginx Security Snippet:
add_header X-Content-Type-Options "nosniff"; add_header X-Frame-Options "DENY";
What it does:
Prevents MIME sniffing and clickjacking attacks.
Step-by-Step Guide:
1. Edit Nginx config (`/etc/nginx/nginx.conf`).
2. Add security headers and reload:
sudo systemctl restart nginx
5. Cloud Security: AWS S3 Bucket Auditing
Command (AWS CLI):
aws s3 ls s3://bucket-name --no-sign-request
What it does:
Checks for publicly accessible S3 buckets.
Step-by-Step Guide:
1. Install AWS CLI and configure credentials.
2. List bucket contents:
aws s3 ls s3://bucket-name --no-sign-request
3. Report misconfigured buckets to the organization.
6. Windows Privilege Escalation
Command (PowerShell):
whoami /priv
What it does:
Lists user privileges to identify escalation opportunities.
Step-by-Step Guide:
1. Run PowerShell as admin.
2. Check privileges:
whoami /priv
3. Exploit misconfigured services (e.g., SeImpersonatePrivilege).
7. API Security Testing with Postman
Request Example:
GET /api/user?id=1 HTTP/1.1 Host: example.com Authorization: Bearer <token>
What it does:
Tests for broken authentication and excessive data exposure.
Step-by-Step Guide:
1. Send requests with missing/invalid tokens.
2. Check for rate-limiting and sensitive data leaks.
What Undercode Say:
- Key Takeaway 1: Automation (SQLmap, Subfinder) accelerates vulnerability discovery but requires ethical use.
- Key Takeaway 2: Misconfigured cloud storage and headers remain top attack vectors.
Analysis:
Bug bounty hunting is evolving with AI-driven tools, but manual testing remains crucial for logic flaws. Researchers must stay updated on OWASP Top 10 and zero-day exploits.
Prediction:
As APIs and cloud adoption grow, misconfigurations will dominate breaches. Bug bounty programs will expand, with AI-assisted hunting becoming standard by 2025.
Join the community:
Stay ethical, stay sharp, and happy hunting! 🚀
IT/Security Reporter URL:
Reported By: Deepak Saini – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
