Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A penetration tester discovers a Java application that deserializes user-controlled data without validation. The tester crafts a malicious serialized object that executes a command upon deserialization. The application runs on a Linux server with a standard Java runtime. Which of the following is the most likely outcome if the malicious object is accepted?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
The application will crash immediately due to an exception.
While a crash is possible, a crafted payload can avoid exceptions and achieve code execution.
B
Distractor review
The application will disclose sensitive information in the response.
Deserialization flaws typically allow arbitrary code execution rather than direct information disclosure.
C
Distractor review
The tester will gain a shell with the privileges of the current user.
This is a partial description; the full impact is arbitrary code execution, which includes shell access.
D
Best answer
The tester will be able to execute arbitrary commands on the server.
Successful exploitation of insecure deserialization in Java often results in remote code execution.
Common exam trap
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.
Technical deep dive
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.
Related practice questions
Related PT0-002 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A penetration tester is writing the executive summary for a report. The client's CEO needs to understand the business impact of a critical SQL injection vulnerability. Which of the following should the tester include?
Question 2
A penetration tester has gained a low-privileged shell on a Linux server. During enumeration, the tester discovers a binary with the SUID bit set that belongs to root and is known to have a buffer overflow vulnerability. What is the MOST effective next step to escalate privileges?
Question 3
A penetration tester is performing passive reconnaissance against a target domain. Which of the following resources can be used to gather information about the target without directly sending packets to the target's network? (Select two.) (Choose 2.)
Question 4
A penetration tester has obtained a TGT from a domain controller by cracking the krbtgt hash. Which attack can the tester now perform to gain persistent administrative access to any resource in the domain?
Question 5
A penetration tester is writing the executive summary for the final report. The CEO needs to understand the overall risk level and the business impact of the findings. Which of the following should be included in the executive summary?
Question 6
A penetration tester is writing the executive summary of a penetration test report. Which of the following elements is MOST important to include for a non-technical audience?
FAQ
Questions learners often ask
What does this PT0-002 question test?
Authentication checks who the user is.
What is the correct answer to this question?
The correct answer is: The tester will be able to execute arbitrary commands on the server. — Java deserialization of untrusted data can lead to remote code execution if the classpath contains gadgets (like Commons Collections) that allow command execution. The tester can use tools like ysoserial to generate a payload that runs an OS command. Option D is correct. Option A (server crash) is possible but not the intended outcome; attackers aim for code execution. Option B (information disclosure) is less likely; deserialization flaws typically lead to code execution. Option C (privilege escalation) occurs only if the process runs with low privileges; but the primary impact is code execution within the application's context.
What should I do if I get this PT0-002 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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