The answer is the Indexes option, which enables directory listing and represents the most significant vulnerability. When Apache’s Indexes directive is active, the web server automatically displays a list of all files and subdirectories in a folder when no default index file like index.html exists, effectively turning the directory into an open file browser. This exposes sensitive data such as configuration backups, source code, or credential files to anyone who requests the directory path, making it a critical information disclosure flaw. On the Certified Information Systems Auditor CISA exam, this scenario tests your understanding of web server hardening and common misconfigurations that lead to unauthorized data exposure; a frequent trap is confusing Indexes with other options like FollowSymLinks or AllowOverride, which require additional conditions to be exploited. Remember the memory tip: “No index? Indexes exposes the indexes.”
CISA Practice Question: Information Systems Acquisition, Development and Implementation
This CISA practice question tests your understanding of information systems acquisition, development and implementation. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Exhibit
Refer to the exhibit.
```
<VirtualHost *:80>
DocumentRoot "/var/www/html"
<Directory "/var/www/html">
Options Indexes FollowSymLinks
AllowOverride All
Require all granted
</Directory>
</VirtualHost>
```
A security review of the above Apache configuration identifies a critical vulnerability. Which of the following is the MOST significant issue?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Directory listing is enabled (Indexes option)
The Indexes option in Apache enables directory listing, which exposes the entire contents of a directory when no index file (e.g., index.html) is present. This can reveal sensitive files, configuration backups, or source code, making it a critical information disclosure vulnerability. Unlike other options, Indexes directly leads to unauthorized data exposure without requiring any additional conditions.
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.
✗
Default DocumentRoot path is used
Why it's wrong here
Using the default path is not a security vulnerability; it may be a configuration drift but not critical.
✓
Directory listing is enabled (Indexes option)
Why this is correct
The Indexes option allows attackers to browse directory contents, potentially exposing sensitive files.
Related concept
Read the scenario before looking for a memorised answer.
✗
AllowOverride All allows .htaccess overrides
Why it's wrong here
While AllowOverride All can be a security concern, it is not as directly exploitable as directory listing.
✗
Require all granted permits all access
Why it's wrong here
Require all granted is a common setting for web servers and is not inherently a vulnerability.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often focus on access control (Require all granted) or override permissions (AllowOverride All) as the most critical issue, but the immediate and direct information disclosure from directory listing (Indexes) is typically the most severe in a standard web server configuration.
Detailed technical explanation
How to think about this question
When Apache receives a request for a directory without an index file (e.g., DirectoryIndex index.html), the mod_autoindex module generates an HTML page listing all files and subdirectories. This behavior is controlled by the Indexes option in the Options directive. In a real-world scenario, an attacker could use this to find backup files like config.php.bak or .git directories, leading to full system compromise. The risk is amplified because directory listing is often enabled by default in some Apache distributions and easily overlooked during security reviews.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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.
Information Systems Acquisition, Development and Implementation — This question tests Information Systems Acquisition, Development and Implementation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Directory listing is enabled (Indexes option) — The Indexes option in Apache enables directory listing, which exposes the entire contents of a directory when no index file (e.g., index.html) is present. This can reveal sensitive files, configuration backups, or source code, making it a critical information disclosure vulnerability. Unlike other options, Indexes directly leads to unauthorized data exposure without requiring any additional conditions.
What should I do if I get this CISA 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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