Access Control: Insecure Direct Object References (IDOR)

This lab demonstrates a common access control vulnerability known as Insecure Direct Object References (IDOR). IDOR occurs when an application exposes internal object references, such as database keys or file names, without proper authorization checks. Attackers exploit this vulnerability by manipulating these references to gain unauthorized access to sensitive data or restricted functions.

• Threat: The exposure of sensitive user data or system functions due to weak or missing access control checks.
  
  

• Attack: An attacker changes object identifiers in URLs or parameters to access data belonging to other users or system components without permission.
  
  

• Defense Mechanisms: Implementing strict authorization checks on the server side to validate user permissions before granting access to objects or resources; using indirect references (e.g., mapping IDs) instead of direct references to internal objects.
  
  

This lab highlights the critical need for robust access control to protect sensitive information and prevent unauthorized data breaches.

Lab Execution Steps:

1. Access the Lab:
   Open the PortSwigger lab for IDOR here:
   Insecure Direct Object References (IDOR) Lab
   
   

2. Log in as a User:
   Use the provided credentials or create an account to log in.
   
   

3. Identify Accessible Objects:
   Navigate through the application and observe URLs or parameters referencing user data or objects (e.g., id=123).
   
   

4. Modify Object References:
   Change the object reference values in the URL or request parameters to access data or pages belonging to other users.
   
   

5. Verify Unauthorized Access:
   Confirm that changing references allows access to unauthorized information without proper permissions.

6. Document Findings:
   Capture screenshots showing the original request, modified request, and unauthorized data accessed.
   
   

7. Mitigation:
   Describe how proper authorization checks and validation on the server side can prevent such vulnerabilities.
   
   

This lab clearly illustrates the risks of IDOR vulnerabilities as a security threat, shows how attackers exploit these flaws, and emphasizes the defense mechanisms necessary to prevent unauthorized access, strengthening overall cybersecurity.