The answer is that an IDOR attack requires two conditions: the application exposes direct object references, such as user IDs or file paths in URLs, and it fails to validate the user's authorization for the requested object. This is correct because IDOR exploits the gap between knowing a reference and having permission to access it; without a direct reference, there is nothing to manipulate, and without a missing authorization check, the manipulation is blocked. On the Certified Ethical Hacker CEH exam, this concept tests your understanding of broken access control, a top OWASP risk, and often appears in scenario-based questions where a user changes an ID in a URL to access another account. A common trap is confusing IDOR with SQL injection—remember, IDOR is about missing permission checks, not input sanitization. For a memory tip, think “Direct Reference + No Check = IDOR,” or simply “DR+NC.”
CEH Web Application and Injection Attacks Practice Question
This CEH practice question tests your understanding of web application and injection attacks. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
An attacker is attempting to perform an Insecure Direct Object Reference (IDOR) attack on a web application. Which TWO conditions are necessary for this attack to succeed?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The application exposes direct references to internal objects (e.g., user IDs in URLs)
IDOR exploits direct references to objects without proper authorization checks. The application must expose direct references (e.g., IDs in URLs) and fail to verify the user's permission to access the object.
Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
The application uses indirect object references (e.g., random tokens)
Why it's wrong here
Indirect references mitigate IDOR.
✓
The application exposes direct references to internal objects (e.g., user IDs in URLs)
Why this is correct
Direct references are necessary for IDOR.
Related concept
Authentication checks who the user is.
✓
The application fails to validate the user's authorization for the requested object
Why this is correct
Lack of authorization check allows IDOR.
Related concept
Authentication checks who the user is.
✗
The application has a CSRF vulnerability
Why it's wrong here
CSRF is a separate attack.
✗
The application implements strong access controls on every object
Why it's wrong here
Strong access controls prevent IDOR.
Common exam traps
Common exam trap: authentication is not authorization
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Detailed technical explanation
How to think about this question
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
KKey Concepts to Remember
Authentication checks who the user is.
Authorization controls what the user is allowed to do after login.
Privilege levels affect access to EXEC and configuration commands.
AAA, TACACS+ and RADIUS can separate login success from command access.
TExam Day Tips
→Do not assume successful login means full administrative access.
→Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
→Separate login problems from permission problems before choosing the answer.
Key takeaway
Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Real-world example
How this comes up in practice
A junior network technician can log in to a core router but cannot reach the enable prompt or configuration mode. The AAA server is authenticating the login — but the authorisation policy only grants privilege level 1, not 15. Authentication (who you are) is working; authorisation (what you can do) is not.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CEH question in full detail.
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related CEH questions on access control and AAA configuration.
Web Application and Injection Attacks — This question tests Web Application and Injection Attacks — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: The application exposes direct references to internal objects (e.g., user IDs in URLs) — IDOR exploits direct references to objects without proper authorization checks. The application must expose direct references (e.g., IDs in URLs) and fail to verify the user's permission to access the object.
What should I do if I get this CEH question wrong?
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related CEH questions on access control and AAA configuration.
What is the key concept behind this question?
Authentication checks who the user is.
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