The answer is a NoSQL injection attack. This is correct because the payload `password[$ne]=a` exploits MongoDB’s `$ne` (not equal) operator, which, when parsed by a vulnerable backend, creates a query that matches any document where the password field is not equal to “a,” effectively bypassing authentication. On the CompTIA PenTest+ PT0-002 exam, this scenario tests your ability to distinguish between SQL and NoSQL injection by recognizing operator syntax like `$ne`, `$gt`, or `$regex` in HTTP requests. A common trap is confusing the square-bracket parameter syntax with standard SQL injection, but the `$` prefix is a dead giveaway for NoSQL operators. For a practical pentest, you can test for this using curl with the `$ne` operator in a login form, as seen in a typical nosql injection curl example pentest. Memory tip: remember “$ne = Not Equal” — if you see a dollar sign before an operator in a POST body, think NoSQL, not SQL.
PT0-002 Tools and Code Analysis Practice Question
This PT0-002 practice question tests your understanding of tools and code analysis. 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 penetration tester is analyzing a Bash script that uses the tool 'curl' to send HTTP requests. The script contains the following line: curl -X POST -d "username=admin&password[$ne]=a" http://target/login. Which type of attack is this script most likely attempting?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Why wrong: XSS involves injecting JavaScript into web pages; the payload does not include any script tags or JavaScript.
B
SQL Injection
Why wrong: SQL injection uses SQL syntax with characters like single quotes. The $ne operator is specific to NoSQL databases like MongoDB.
C
NoSQL Injection
The $ne operator is a MongoDB query operator. By injecting it into the password field, the attacker attempts to make the query return true for any user, bypassing authentication.
D
Directory Traversal
Why wrong: Directory traversal uses path manipulation (e.g., ../) to access files. This payload is in a POST data field and targets authentication logic.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
NoSQL Injection
The payload `password[$ne]=a` uses MongoDB's `$ne` (not equal) operator, which is a NoSQL query operator. When the backend parses this as a MongoDB query, it will match any document where the password is not equal to 'a', effectively bypassing authentication. This is a classic NoSQL injection attack, not SQL injection, because the syntax targets NoSQL databases like MongoDB.
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
XSS involves injecting JavaScript into web pages; the payload does not include any script tags or JavaScript.
✗
SQL Injection
Why it's wrong here
SQL injection uses SQL syntax with characters like single quotes. The $ne operator is specific to NoSQL databases like MongoDB.
✓
NoSQL Injection
Why this is correct
The $ne operator is a MongoDB query operator. By injecting it into the password field, the attacker attempts to make the query return true for any user, bypassing authentication.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Directory Traversal
Why it's wrong here
Directory traversal uses path manipulation (e.g., ../) to access files. This payload is in a POST data field and targets authentication logic.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates see a POST request with parameters and immediately think SQL injection, but the square bracket syntax `[$ne]` is a dead giveaway for NoSQL injection, which is a distinct attack vector targeting document-based databases.
Detailed technical explanation
How to think about this question
NoSQL injection exploits the fact that many NoSQL databases (e.g., MongoDB, CouchDB) accept JSON-like query operators in HTTP parameters. The `$ne` operator in MongoDB returns documents where the field value is not equal to the specified value; when used in a login form, it can match any password except the one provided, effectively bypassing authentication. Real-world attacks often chain multiple operators like `$gt`, `$regex`, or `$where` for more complex injection.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this PT0-002 question in full detail.
Tools and Code Analysis — This question tests Tools and Code Analysis — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: NoSQL Injection — The payload `password[$ne]=a` uses MongoDB's `$ne` (not equal) operator, which is a NoSQL query operator. When the backend parses this as a MongoDB query, it will match any document where the password is not equal to 'a', effectively bypassing authentication. This is a classic NoSQL injection attack, not SQL injection, because the syntax targets NoSQL databases like MongoDB.
What should I do if I get this PT0-002 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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.