Question 308 of 509

Attacks and Exploits →hardMultiple ChoiceObjective-mapped

Quick Answer

The answer is to use the php://input wrapper and send PHP code in the POST body. This technique works because the php://input stream reads raw HTTP POST data, and when passed to an unsanitized include() function, the server executes that data as PHP code, directly converting a local file inclusion into remote code execution. On the CompTIA PenTest+ PT0-002 exam, this scenario tests your understanding of PHP stream wrappers and how they bypass common file inclusion filters—a frequent trap is confusing php://input with data:// or expecting file uploads to work without additional conditions. Remember that php://input requires the allow_url_include directive to be enabled, which is often true in older or misconfigured environments. A quick memory tip: think of the POST body as your payload’s “input” pipe—if you can include it, you can execute it.

PT0-002 Attacks and Exploits Practice Question

This PT0-002 practice question tests your understanding of attacks and exploits. 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 has discovered a local file inclusion (LFI) vulnerability in a PHP web application. The vulnerable code uses the following pattern: include($_GET['page']);. The application runs on a Linux server with Apache and PHP. The tester wants to achieve remote code execution (RCE). Which technique is most likely to succeed given this LFI?

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.

Question 1hardmultiple choice

Read the full NAT/PAT explanation →

A
Use the php://input wrapper and send PHP code in the POST body.
php://input reads the raw POST data. When included, the PHP interpreter will execute any code contained in the POST body. This is a common technique to turn LFI into RCE, and it does not require allow_url_include to be enabled.
B
Use the file:// wrapper to read sensitive files like /etc/passwd.
Why wrong: File reading via file:// can retrieve sensitive information but does not achieve code execution. It is useful for information gathering, not RCE.
C
Use the data:// wrapper with a base64-encoded PHP payload.
Why wrong: The data:// wrapper allows inline data inclusion. However, it relies on allow_url_include being enabled, which is often disabled for security reasons. Therefore, it is less reliable than php://input.
D
Set allow_url_include to On in php.ini via the LFI.
Why wrong: The LFI vulnerability allows inclusion of files but not modification of server configuration. Changing php.ini requires write access or other exploitation, which is not possible through LFI alone.

Full breakdown with real-world context →

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

✓

Use the php://input wrapper and send PHP code in the POST body.

The correct technique is to use the php://input wrapper because it allows the attacker to pass arbitrary PHP code in the HTTP POST body, which the include() function will execute as PHP. Since the vulnerable code directly includes user input without sanitization, the php://input stream reads the raw POST data and processes it as a PHP script, achieving remote code execution.

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.

✓
Use the php://input wrapper and send PHP code in the POST body.
Why this is correct
php://input reads the raw POST data. When included, the PHP interpreter will execute any code contained in the POST body. This is a common technique to turn LFI into RCE, and it does not require allow_url_include to be enabled.
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.
✗
Use the file:// wrapper to read sensitive files like /etc/passwd.
Why it's wrong here
File reading via file:// can retrieve sensitive information but does not achieve code execution. It is useful for information gathering, not RCE.
✗
Use the data:// wrapper with a base64-encoded PHP payload.
Why it's wrong here
The data:// wrapper allows inline data inclusion. However, it relies on allow_url_include being enabled, which is often disabled for security reasons. Therefore, it is less reliable than php://input.
✗
Set allow_url_include to On in php.ini via the LFI.
Why it's wrong here
The LFI vulnerability allows inclusion of files but not modification of server configuration. Changing php.ini requires write access or other exploitation, which is not possible through LFI alone.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often assume data:// is the most direct way to inject code, but they overlook that php://input is more reliable because it does not require allow_url_include to be enabled, which is a common security hardening measure.

Detailed technical explanation

How to think about this question

The php://input wrapper reads the raw HTTP request body and is available even when allow_url_include is Off, as long as allow_url_fopen is On (which is typical). In contrast, the data:// wrapper requires allow_url_include to be enabled, which is often disabled for security reasons. This distinction is critical in real-world engagements where default PHP settings may block certain wrappers but leave php://input accessible.

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 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.

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this PT0-002 question test?

Attacks and Exploits — This question tests Attacks and Exploits — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Use the php://input wrapper and send PHP code in the POST body. — The correct technique is to use the php://input wrapper because it allows the attacker to pass arbitrary PHP code in the HTTP POST body, which the include() function will execute as PHP. Since the vulnerable code directly includes user input without sanitization, the php://input stream reads the raw POST data and processes it as a PHP script, achieving remote code execution.

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.

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