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Insecure Direct Object Reference (IDOR) is a common vulnerability that occurs when an application provides direct access to objects based on user-supplied input. This can lead to unauthorized access to sensitive data or functionality. In this article, we will explore how to identify and exploit IDOR vulnerabilities, along with practical steps and commands to test for them.
You Should Know:
1. Understanding IDOR:
- IDOR occurs when an application uses user-supplied input to access objects directly without proper authorization checks.
- Example: A web application might use a URL like
https://example.com/profile?id=123` to display a user's profile. If the application does not check if the logged-in user is authorized to view profile123`, an attacker can change the `id` parameter to access other users’ profiles.
2. Testing for IDOR:
- Step 1: Create two user accounts on the target application.
- Step 2: Log in with the first account and access a resource (e.g., a profile page).
- Step 3: Note the URL or request parameters used to access the resource.
- Step 4: Log out and log in with the second account.
- Step 5: Attempt to access the same resource using the URL or parameters noted in Step 3.
- Step 6: If the second account can access the resource, an IDOR vulnerability exists.
3. Exploiting IDOR:
- Example Command: Use `curl` to test for IDOR vulnerabilities:
curl -H "Cookie: session=your_session_cookie" https://example.com/profile?id=123
- Replace `your_session_cookie` with the actual session cookie of the logged-in user and change the `id` parameter to test for unauthorized access.
4. Preventing IDOR:
- Implement proper access control checks to ensure that users can only access resources they are authorized to view.
- Use indirect object references, such as mapping user-supplied input to internal object identifiers.
- Example: Instead of using
id=123, use a hashed or encrypted value that the server can map to the actual object.
5. Tools for Testing IDOR:
- Burp Suite: Use Burp Suite to intercept and modify requests to test for IDOR vulnerabilities.
- OWASP ZAP: OWASP ZAP is another tool that can be used to automate the detection of IDOR vulnerabilities.
6. Example Scenario:
- Scenario: A web application allows users to view their own orders by accessing `https://example.com/orders?id=123`.
- Test: Change the `id` parameter to `124` and see if you can access another user’s order.
- Command: Use `curl` to test:
curl -H "Cookie: session=your_session_cookie" https://example.com/orders?id=124
What Undercode Say:
IDOR vulnerabilities are a serious threat to web applications, as they can lead to unauthorized access to sensitive data. It is crucial for developers to implement proper access control mechanisms and for penetration testers to thoroughly test for these vulnerabilities. By following the steps and commands outlined in this article, you can identify and mitigate IDOR vulnerabilities in your applications.
Additional Resources:
References:
Reported By: Aminullah Sheikh – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
