The correct answer is PHP CGI argument injection (CVE-2019-11043). This vulnerability is present because the exhibit shows Apache/2.4.39 running PHP 7.3.9, which falls within the affected range of PHP 7.3.x before 7.3.11, where a flaw in PHP-FPM’s handling of the `PATH_INFO` parameter allows an attacker to inject query strings and achieve remote code execution. On the CompTIA PenTest+ PT0-002 exam, this scenario tests your ability to identify a specific CVE by correlating software versions from a port scan, a common trap being to overlook the exact PHP minor version or to confuse it with a general CGI injection. A useful memory tip is to remember “7.3.9, PATH_INFO, and the FPM flaw” — if you see Apache with mod_proxy_fcgi and PHP 7.3.x below 7.3.11, think of the “fastcgi fiasco” that lets an attacker inject arguments directly into the server’s query string.
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.
Refer to the exhibit. A penetration tester performed a port scan and collected the information shown. Which vulnerability is most likely present based on the software versions?
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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
PHP CGI argument injection (CVE-2019-11043)
The exhibit shows Apache/2.4.39 with PHP 7.3.9, which is vulnerable to CVE-2019-11043, a PHP CGI argument injection flaw. This vulnerability allows an attacker to send specially crafted query strings to a PHP-FPM server via the `PATH_INFO` parameter, leading to remote code execution. The specific software versions match the known affected range (PHP 7.3.x before 7.3.11 and Apache with mod_proxy_fcgi).
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.
Apache 2.4.29 does not have known directory traversal vulnerabilities; older versions do.
✓
PHP CGI argument injection (CVE-2019-11043)
Why this is correct
PHP 7.2.24 is vulnerable to CVE-2019-11043 which allows remote code execution via specially crafted paths.
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates see 'Apache' and 'PHP' and immediately think of directory traversal (Option C), but the specific version numbers (Apache 2.4.39, PHP 7.3.9) are the key to identifying the PHP CGI argument injection vulnerability, not a generic Apache flaw.
Detailed technical explanation
How to think about this question
CVE-2019-11043 exploits a flaw in PHP-FPM's `fpm_main.c` where the `PATH_INFO` variable is not properly validated when `cgi.fix_pathinfo` is enabled, allowing an attacker to inject arguments via `%0a` (newline) encoding. The attack sends a crafted HTTP request with a `?%0a` query string to trigger a buffer underflow in the `sapi/fpm/fpm_main.c` function, leading to memory corruption and code execution. In real-world scenarios, this vulnerability was widely used in mass scans against misconfigured NGINX or Apache servers proxying to PHP-FPM.
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.
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: PHP CGI argument injection (CVE-2019-11043) — The exhibit shows Apache/2.4.39 with PHP 7.3.9, which is vulnerable to CVE-2019-11043, a PHP CGI argument injection flaw. This vulnerability allows an attacker to send specially crafted query strings to a PHP-FPM server via the `PATH_INFO` parameter, leading to remote code execution. The specific software versions match the known affected range (PHP 7.3.x before 7.3.11 and Apache with mod_proxy_fcgi).
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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Question Discussion
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