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You Should Know:
1. IDOR (Insecure Direct Object Reference) Exploitation:
- IDOR vulnerabilities occur when an application provides direct access to objects based on user-supplied input. Attackers can manipulate these inputs to access unauthorized data.
- Example: In the provided scenario, the penetration tester manipulated the `POST /deployables/folders/getAll` request by removing all parameters, which returned all folder IDs, including those restricted to admins.
Practice Code:
curl -X POST "https://example.com/deployables/folders/getAll" -H "Content-Type: application/json" -d '{}'
– This command sends a POST request with an empty JSON body, potentially exploiting an IDOR vulnerability if the server does not properly validate user permissions.
2. HTML Injection (HTMLi):
- HTML Injection occurs when an attacker is able to inject HTML code into a webpage, which can lead to Cross-Site Scripting (XSS) if not properly sanitized.
- Always validate input on the server-side, not just the client-side, to prevent such vulnerabilities.
Practice Code:
<script>alert('XSS')</script>
– This is a simple XSS payload that can be used to test for HTML injection vulnerabilities. If the input is not properly sanitized, this script will execute in the browser.
3. Client-Side Validation Bypass:
- Client-side validation can be easily bypassed by tools like Burp Suite or by directly manipulating the DOM.
- Always implement server-side validation to ensure security.
Practice Code:
document.getElementById('inputField').value = 'malicious input';
– This JavaScript code can be used to manipulate the value of an input field directly in the browser, bypassing client-side validation.
What Undercode Say:
- IDOR and HTML Injection are critical vulnerabilities that can lead to unauthorized data access and potential system compromise. Always validate and sanitize user inputs on both the client and server sides. Use tools like Burp Suite, OWASP ZAP, and curl to test for these vulnerabilities. Regularly update your knowledge and practice with platforms like Hack The Box, TryHackMe, and Bug Bounty programs to stay ahead in the cybersecurity field.
Useful URLs:
Conclusion:
- Understanding and mitigating IDOR and HTML Injection vulnerabilities are crucial for securing web applications. Regular testing, proper validation, and staying updated with the latest security practices are essential for any penetration tester or bug bounty hunter.
References:
Reported By: Ahmed Hany – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
