This PT0-002 practice question tests your understanding of attacks and exploits. Compare every option against the stated constraints before choosing — the best answer satisfies all requirements, not just the most obvious one. A key principle to apply: rOP reuses existing code snippets (gadgets) to bypass NX.. 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.
During a penetration test, a tester identifies a buffer overflow vulnerability in a Linux binary. The system has ASLR and NX (Non-Executable) enabled. The tester finds a ROP gadget at a fixed address in a library that is loaded at a constant address across reboots. Which exploitation method is the most appropriate to achieve code execution?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Return-Oriented Programming (ROP) chain
Option B is correct because Return-Oriented Programming (ROP) is specifically designed to bypass both ASLR and NX when a fixed-address ROP gadget is available. Since the library is loaded at a constant address across reboots, the tester can chain gadgets from that library to execute arbitrary code without needing to inject executable shellcode.
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Return-to-libc attack
Why it's wrong here
Return-to-libc is a limited form of ROP; it may not allow complex operations if multiple functions are needed.
✓
Return-Oriented Programming (ROP) chain
Why this is correct
ROP chains bypass both ASLR (if gadgets are at fixed addresses) and NX by reusing existing code snippets.
Related concept
ROP reuses existing code snippets (gadgets) to bypass NX.
✗
Heap spraying
Why it's wrong here
Heap spraying places shellcode in predictable heap locations but still requires an executable memory region, which NX prevents.
✗
SEH overwrite exploit
Why it's wrong here
SEH overwrite is a Windows-specific technique and does not apply to Linux.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse return-to-libc with ROP, but return-to-libc is limited to calling a single function and cannot chain multiple gadgets, which is necessary for complex code execution when NX is enabled.
Detailed technical explanation
How to think about this question
ROP works by chaining small instruction sequences (gadgets) that end with a ret instruction, allowing the attacker to control the stack and execute arbitrary operations without injecting code. In this scenario, the fixed-address library provides a stable set of gadgets, enabling the tester to bypass NX by reusing existing code and ASLR by relying on a non-randomized module. A real-world example is exploiting a vulnerable SUID binary where a non-PIE library is loaded at a constant address, making ROP chains reliable across reboots.
KKey Concepts to Remember
ROP reuses existing code snippets (gadgets) to bypass NX.
ROP chains are built by arranging gadget addresses on the stack.
Fixed gadget addresses bypass ASLR for those specific gadgets.
Each gadget typically ends with a 'ret' instruction to chain execution.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
ROP reuses existing code snippets (gadgets) to bypass NX.
Real-world example
How this comes up in practice
A security team runs a vulnerability scan on a web application and discovers an unpatched SQL injection flaw. The team prioritises remediation by CVSS score — critical flaws are patched within 24 hours, high within 7 days. Questions like this test whether you understand vulnerability management processes, scanning tools, and remediation prioritisation.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this PT0-002 question in full detail.
Attacks and Exploits — This question tests Attacks and Exploits — ROP reuses existing code snippets (gadgets) to bypass NX..
What is the correct answer to this question?
The correct answer is: Return-Oriented Programming (ROP) chain — Option B is correct because Return-Oriented Programming (ROP) is specifically designed to bypass both ASLR and NX when a fixed-address ROP gadget is available. Since the library is loaded at a constant address across reboots, the tester can chain gadgets from that library to execute arbitrary code without needing to inject executable shellcode.
What should I do if I get this PT0-002 question wrong?
Review rOP reuses existing code snippets (gadgets) to bypass NX., then practise related PT0-002 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
ROP reuses existing code snippets (gadgets) to bypass NX.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This PT0-002 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PT0-002 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.