The correct answer is stack smashing, along with arbitrary code execution, as the two vulnerabilities directly associated with buffer overflow attacks. This is because a buffer overflow occurs when a program writes more data to a buffer than it can hold, overwriting adjacent memory on the stack. An attacker can then exploit this by injecting and executing arbitrary code, often by overwriting the return address to hijack control flow, while stack smashing is the specific technique of deliberately corrupting the call stack to achieve that hijack. On the Certified Ethical Hacker CEH exam, this concept tests your understanding of memory corruption exploits and how they enable remote code execution; a common trap is confusing stack smashing with heap overflows, which target different memory regions. To remember, think of the stack as a tower of blocks—smashing it lets you rearrange the top block (the return address) to run your own code.
CEH Vulnerability Analysis and System Hacking Practice Question
This CEH practice question tests your understanding of vulnerability analysis and system hacking. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Which TWO vulnerabilities are associated with buffer overflow attacks?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Arbitrary code execution
Buffer overflow attacks occur when a program writes more data to a buffer than it can hold, overwriting adjacent memory. This can corrupt the stack and allow an attacker to inject and execute arbitrary code (option A) by overwriting the return address or function pointers. Stack smashing (option B) is a specific technique that deliberately corrupts the call stack to hijack control flow, often as part of a buffer overflow exploit.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Arbitrary code execution
Why this is correct
Successful buffer overflow attacks often lead to arbitrary code execution.
Related concept
Read the scenario before looking for a memorised answer.
✓
Stack smashing
Why this is correct
Stack-based buffer overflows can overwrite return addresses, causing stack smashing.
Related concept
Read the scenario before looking for a memorised answer.
✗
Authentication bypass via SQL injection
Why it's wrong here
SQL injection is a separate vulnerability.
✗
Cross-site scripting (XSS)
Why it's wrong here
XSS is a client-side injection, not buffer overflow.
✗
Race condition
Why it's wrong here
Race conditions involve timing issues, not buffer overflows.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse buffer overflow with other injection or concurrency flaws, but the CEH exam specifically pairs arbitrary code execution and stack smashing as the two direct consequences of a buffer overflow.
Detailed technical explanation
How to think about this question
In a classic stack-based buffer overflow, the attacker overwrites the saved return address on the stack with a pointer to shellcode placed in the buffer. Modern mitigations like ASLR (Address Space Layout Randomization) and NX (No-Execute) bits make exploitation harder, but techniques such as ROP (Return-Oriented Programming) bypass these protections. Real-world examples include the Morris Worm (1988) exploiting a buffer overflow in fingerd and the EternalBlue exploit (2017) targeting SMBv1.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
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
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the CEH exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CEH question in full detail.
Vulnerability Analysis and System Hacking — This question tests Vulnerability Analysis and System Hacking — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Arbitrary code execution — Buffer overflow attacks occur when a program writes more data to a buffer than it can hold, overwriting adjacent memory. This can corrupt the stack and allow an attacker to inject and execute arbitrary code (option A) by overwriting the return address or function pointers. Stack smashing (option B) is a specific technique that deliberately corrupts the call stack to hijack control flow, often as part of a buffer overflow exploit.
What should I do if I get this CEH question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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