CEH Web Application and Injection Attacks Practice Test 1 — 15 Questions

Question 1

A security analyst notices that the web application returns different response times when a valid username is submitted versus an invalid one during login. Which type of vulnerability is likely being exploited?

Accepted Answer

Time-based SQL injection. Time-based SQL injection involves injecting SQL code that causes the database to pause if a condition is true, allowing an attacker to infer information based on response times. The observed difference in response times for valid vs. invalid usernames is characteristic of this technique.

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Reflected XSS

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Blind boolean-based SQL injection

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CSRF

Question 2

Which of the following tools is commonly used to automate the detection and exploitation of SQL injection vulnerabilities?

Accepted Answer

SQLMap. SQLMap is a widely used open-source tool that automates the process of detecting and exploiting SQL injection flaws in web applications.

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Metasploit

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Nmap

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Burp Suite

Question 3

A penetration tester intercepts the following request using Burp Suite: POST /change_password HTTP/1.1 Host: example.com Cookie: sessionid=abc123; SameSite=Lax Content-Type: application/x-www-form-urlencoded new_password=Hacker123 The tester successfully crafts a CSRF attack by embedding a hidden form in a malicious page. Which mitigation is most likely missing?

Accepted Answer

CSRF token. The presence of a SameSite cookie set to Lax does not prevent CSRF for state-changing requests like password change if the attack uses a GET or POST from a top-level navigation. However, the primary missing mitigation is a CSRF token, which is a unique unpredictable value tied to the session and validated by the server.

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SameSite=Strict

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HTTPOnly flag

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Secure flag

Question 4

A web application allows users to upload profile pictures. An attacker uploads a file named "profile.php" containing malicious PHP code. When the attacker visits the uploaded file's URL, the code executes. Which vulnerability is being exploited?

Accepted Answer

File upload vulnerability. The application fails to validate the file type or restrict execution, allowing a malicious PHP file to be uploaded and executed on the server, which is a classic file upload vulnerability leading to remote code execution.

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Directory traversal

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Command injection

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Stored XSS

Question 5

An analyst observes the following log entry on a web server: GET /../../etc/passwd HTTP/1.1 200. Which type of attack is indicated?

Accepted Answer

Directory traversal. The log shows a request attempting to traverse directories using '../' to access a sensitive system file (/etc/passwd), which is directory traversal.

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SSRF

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LFI

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Command injection

Question 6

During a penetration test, a tester uses the following payload in a search field: . The payload is reflected in the response without sanitization. However, the tester notices that the attack only works when the payload is submitted via a POST request, not GET. Which type of XSS is this?

Accepted Answer

Reflected XSS. Reflected XSS occurs when the payload is reflected immediately in the response. The fact that it works via POST but not GET does not change the classification; it is still reflected XSS because the payload is not stored on the server. Some reflected XSS may be triggered only via POST parameters.

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Stored XSS

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DOM-based XSS

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Self-XSS

Question 7

Which of the following is the primary purpose of using a CSRF token in a web application?

Accepted Answer

Prevent cross-site request forgery. CSRF tokens are unique, unpredictable values embedded in forms or requests that validate the request originated from the legitimate application, preventing cross-site request forgery attacks.

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Prevent session hijacking

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Prevent XSS

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Prevent SQL injection

Question 8

A web application uses user input in the following PHP code: include($_GET['page'] . '.php');. An attacker submits the URL: http://example.com/index.php?page=../../../../etc/passwd%00. Which two vulnerabilities are being attempted?

Accepted Answer

LFI and null byte injection. The attacker is using '../' for directory traversal to access files outside the web root, and a null byte injection (%00) to truncate the '.php' extension. This targets LFI (local file inclusion) via directory traversal.

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RFI and command injection

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SQL injection and XSS

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Directory traversal and IDOR

Question 9

Which Burp Suite tool is most appropriate for modifying and re-sending a single HTTP request multiple times with different payloads to test for SQL injection?

Accepted Answer

Intruder. Burp Intruder is designed for automated customized attacks, allowing you to send many requests with varying payloads to a single target endpoint.

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Repeater

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Proxy

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Scanner

Question 10

A penetration tester finds that a web application accepts XML input and returns the parsed data in the response. The tester submits the following payload: ]>&xxe;. The server returns the contents of /etc/passwd. Which vulnerability is being exploited?

Accepted Answer

XXE injection. The payload defines an external entity (XXE) that reads a local file, indicating an XML External Entity (XXE) injection vulnerability.

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SSRF

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Command injection

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XPath injection

Question 11

An attacker attempts to log into a web application by trying many common passwords for a list of known usernames. Which type of authentication attack is this?

Accepted Answer

Password spraying. Password spraying involves using a few common passwords against many usernames to avoid account lockouts, as opposed to brute force (many passwords on one account) or credential stuffing (using known username/password pairs).

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Dictionary attack

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Credential stuffing

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Brute force attack

Question 12

A security analyst wants to check if a web application is vulnerable to Server-Side Request Forgery (SSRF). Which of the following actions would be most effective?

Accepted Answer

Send a request with a URL parameter pointing to an internal IP address. Crafting a request that makes the server fetch an internal IP address (like 127.0.0.1) and observing if the response includes data from that internal resource is a good test for SSRF.

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Submit a base64-encoded payload in a cookie

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Use SQLMap with a time-based payload

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Modify the Host header to point to localhost

Question 13

Which TWO of the following are effective mitigations against Cross-Site Request Forgery (CSRF)?

Accepted Answer

Using SameSite cookies. CSRF tokens and SameSite cookies are standard defenses. The other options do not prevent CSRF: input validation does not; anti-CSRF tokens are synonymous; referer header validation is weak.

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Input validation

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Using anti-CSRF tokens

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Using HTTPOnly cookies

Question 14

A web application is vulnerable to SQL injection. Which THREE of the following techniques can be used to extract data from the database using blind SQL injection?

Accepted Answer

Time-based. Boolean-based, time-based, and out-of-band are all types of blind SQL injection. Error-based and union-based are in-band techniques, not blind.

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Error-based

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Union-based

Question 15

Which TWO of the following are characteristics of stored (persistent) XSS?

Accepted Answer

The malicious script is stored on the server (e.g., in a database). Stored XSS involves malicious script being permanently stored on the server and executed whenever the stored content is accessed. It does not require a crafted link, and it can affect multiple users.

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The attack requires the victim to click a crafted link

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The payload is reflected immediately in the response

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The attack only works if the victim is logged in