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Bug bounty hunting is a challenging yet rewarding field, and understanding common vulnerabilities is crucial for success. Thiago Marques, a seasoned bug hunter, highlights the most frequent issues he encounters: IDOR (Insecure Direct Object Reference), Improper Access Control, Information Disclosure, Misconfiguration, and HTML Injection (XSS). These vulnerabilities are often the low-hanging fruit that can lead to significant payouts.
You Should Know:
To effectively hunt for these vulnerabilities, you need to understand how they work and how to exploit them. Below are some practical commands, codes, and steps to help you get started:
1. IDOR (Insecure Direct Object Reference)
- Description: IDOR occurs when an application provides direct access to objects based on user-supplied input, allowing attackers to bypass authorization.
- Example: Change the `user_id` parameter in the URL to access another user’s data.
curl -X GET "https://example.com/api/user?id=12345" -H "Authorization: Bearer YOUR_TOKEN"
- Mitigation: Always validate user input and implement proper access controls.
2. Improper Access Control
- Description: This vulnerability arises when an application fails to enforce proper restrictions on what authenticated users are allowed to do.
- Example: Access an admin page without proper privileges.
curl -X GET "https://example.com/admin" -H "Cookie: session=YOUR_SESSION_COOKIE"
- Mitigation: Implement role-based access control (RBAC) and regularly audit permissions.
3. Information Disclosure
- Description: Sensitive information is exposed to unauthorized users, often due to misconfigurations.
- Example: Accessing a `.git` directory to retrieve source code.
curl -X GET "https://example.com/.git/config"
- Mitigation: Disable directory listing and ensure sensitive files are not accessible.
4. Misconfiguration
- Description: Misconfigurations can lead to various security issues, such as exposed admin panels or debug modes.
- Example: Accessing an exposed admin panel.
curl -X GET "https://example.com/admin"
- Mitigation: Regularly audit server configurations and disable unnecessary services.
5. HTML Injection (XSS)
- Description: XSS allows attackers to inject malicious scripts into web pages viewed by other users.
- Example: Injecting a script into a vulnerable input field.
<script>alert('XSS')</script> - Mitigation: Sanitize user input and implement Content Security Policy (CSP).
What Undercode Say:
Bug bounty hunting requires a deep understanding of common vulnerabilities and the ability to exploit them effectively. By mastering these techniques and using the provided commands, you can significantly improve your chances of finding and reporting bugs. Remember, knowledge is power in this field, and continuous learning is key to staying ahead.
For further reading, check out these resources:
Keep practicing, and happy hunting!
References:
Reported By: Thiago Marques – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
