- A
Cross-site scripting (XSS)
Why wrong: Cross-site scripting involves injecting malicious scripts into a web application that execute in a victim's browser. It does not allow direct execution of system commands on the server.
- B
SQL injection
Why wrong: SQL injection targets database queries by inserting malicious SQL statements. The scenario involves system command execution, not database manipulation.
- C
Command injection
Command injection allows an attacker to execute arbitrary system commands by exploiting unsanitized input passed to system calls. The use of a semicolon to chain commands is a classic indicator of this attack.
- D
Directory traversal
Why wrong: Directory traversal attacks exploit insufficient path sanitation to access files outside the intended directory. While it deals with file access, it does not involve executing system commands or chaining multiple commands.
SY0-701 Threats, Vulnerabilities, and Mitigations Practice Question
This SY0-701 practice question tests your understanding of threats, vulnerabilities, and mitigations. 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.
A security analyst is investigating a web application that allows users to input a filename to view its contents. The application passes the user input directly to a system command without sanitization. An attacker submits the input 'file.txt; cat /etc/passwd' and successfully retrieves the contents of the password file. Which type of attack occurred?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Command injection
The application passes user input directly to a system command without sanitization. The attacker's input 'file.txt; cat /etc/passwd' uses a semicolon to terminate the intended command and execute a second command, which retrieves the password file. This is a classic command injection attack, where arbitrary system commands are executed via the vulnerable interface.
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.
- ✗
Cross-site scripting (XSS)
Why it's wrong here
Cross-site scripting involves injecting malicious scripts into a web application that execute in a victim's browser. It does not allow direct execution of system commands on the server.
When this WOULD be correct
A web application reflects user input without sanitization, and an attacker submits a script like <script>alert('XSS')</script> that executes in another user's browser, stealing session cookies.
- ✗
SQL injection
Why it's wrong here
SQL injection targets database queries by inserting malicious SQL statements. The scenario involves system command execution, not database manipulation.
When this WOULD be correct
A web application takes user input and directly concatenates it into a SQL query without sanitization, e.g., 'SELECT * FROM users WHERE id = ' + user_input. An attacker submits '1 OR 1=1' to retrieve all records.
- ✓
Command injection
Why this is correct
Command injection allows an attacker to execute arbitrary system commands by exploiting unsanitized input passed to system calls. The use of a semicolon to chain commands is a classic indicator of this attack.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Directory traversal
Why it's wrong here
Directory traversal attacks exploit insufficient path sanitation to access files outside the intended directory. While it deals with file access, it does not involve executing system commands or chaining multiple commands.
When this WOULD be correct
A question where user input is used to construct a file path (e.g., 'filename=../../../etc/passwd') and the application fails to validate or sanitize the path, allowing access to sensitive files outside the intended directory.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The SY0-701 exam frequently reuses these exact scenarios with slightly different constraints.
✓Command injectionCorrect answer▾
Why this is correct
Command injection allows an attacker to execute arbitrary system commands by exploiting unsanitized input passed to system calls. The use of a semicolon to chain commands is a classic indicator of this attack.
✗Cross-site scripting (XSS)Wrong answer — click to see why▾
Why this is wrong here
The attack involves injecting a system command via user input, not injecting client-side scripts into web pages viewed by other users.
★ When this WOULD be the correct answer
A web application reflects user input without sanitization, and an attacker submits a script like <script>alert('XSS')</script> that executes in another user's browser, stealing session cookies.
Why candidates choose this
Candidates may confuse any injection-based attack with XSS, especially when the input is unsanitized, without recognizing the specific context of command execution versus script execution.
✗SQL injectionWrong answer — click to see why▾
Why this is wrong here
The attack involves executing system commands via user input, not manipulating a database query. SQL injection targets database queries, not system commands.
★ When this WOULD be the correct answer
A web application takes user input and directly concatenates it into a SQL query without sanitization, e.g., 'SELECT * FROM users WHERE id = ' + user_input. An attacker submits '1 OR 1=1' to retrieve all records.
Why candidates choose this
Candidates may confuse injection attacks, thinking any injection is SQL injection, or they may not distinguish between command injection and SQL injection.
✗Directory traversalWrong answer — click to see why▾
Why this is wrong here
Directory traversal involves accessing files outside the web root by manipulating path parameters (e.g., '../../etc/passwd'), not by injecting commands. The attacker here injected a command separator (';') to execute an arbitrary system command, which is command injection.
★ When this WOULD be the correct answer
A question where user input is used to construct a file path (e.g., 'filename=../../../etc/passwd') and the application fails to validate or sanitize the path, allowing access to sensitive files outside the intended directory.
Why candidates choose this
Candidates may confuse the retrieval of '/etc/passwd' with directory traversal, but the key difference is the use of a command separator (';') versus path traversal sequences ('../').
Analysis generated from the official SY0-701blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The SY0-701 exam often tests the distinction between command injection and directory traversal by using a payload that includes both a path and a command separator, leading candidates to mistakenly choose directory traversal when the core exploit is command execution via shell metacharacters.
Trap categories for this question
Command / output trap
Cross-site scripting involves injecting malicious scripts into a web application that execute in a victim's browser. It does not allow direct execution of system commands on the server.
Scenario analysis trap
SQL injection targets database queries by inserting malicious SQL statements. The scenario involves system command execution, not database manipulation.
Detailed technical explanation
How to think about this question
Command injection exploits the lack of input validation when user input is concatenated into a system command string. The semicolon is a command separator in Unix/Linux shells, allowing multiple commands to be executed sequentially. In real-world scenarios, this vulnerability can be mitigated by using parameterized APIs (e.g., subprocess.run with a list in Python) or strict allowlists for filenames, rather than shell escaping, which is often incomplete.
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 developer is choosing between AES-256 (symmetric) and RSA-2048 (asymmetric) for encrypting a large file that will be sent to a partner. Symmetric encryption is fast but requires key exchange; asymmetric is slower but solves the key distribution problem. A hybrid approach — encrypt the file with AES, encrypt the AES key with RSA — is standard. Questions like this test whether you understand when each approach applies.
What to study next
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FAQ
Questions learners often ask
What does this SY0-701 question test?
Threats, Vulnerabilities, and Mitigations — This question tests Threats, Vulnerabilities, and Mitigations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Command injection — The application passes user input directly to a system command without sanitization. The attacker's input 'file.txt; cat /etc/passwd' uses a semicolon to terminate the intended command and execute a second command, which retrieves the password file. This is a classic command injection attack, where arbitrary system commands are executed via the vulnerable interface.
What should I do if I get this SY0-701 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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Last reviewed: Jun 11, 2026
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