Sql+injection+challenge+5+security+shepherd+new [updated] ✯ 〈DELUXE〉
Walkthrough: OWASP Security Shepherd – SQL Injection Challenge 5
This challenge moves beyond basic authentication bypass and requires you to extract specific data from a database using a Union-Based SQL Injection. Your goal is to retrieve the "secret key" hidden in a table you don't initially have access to. 1. Identify the Vulnerability
The application provides a search or filter field (often a user search). When you input a common character like a single quote ('), you may see a database error or a change in behavior, indicating the input is not being sanitized before being placed into a SQL query. 2. Determine the Number of Columns
To use a UNION statement, your injected query must have the same number of columns as the original query. We test this using ORDER BY: ' ORDER BY 1-- (Success) ' ORDER BY 2-- (Success)
' ORDER BY 3-- (Error!)If "3" causes an error, we know the original query selects 2 columns. 3. Locate the Target Table and Column
In Security Shepherd, the goal is typically to find the secret or key within the database schema. Since this is an introductory lab, we often look for a table named key or similar. To find all table names in a MySQL-based environment, you can use:
' UNION SELECT table_name, NULL FROM information_schema.tables-- 4. Extract the Key
Once you identify the table name (let's assume it is key_table) and the column name (e.g., secret_key), craft the final payload to display the data in the search results: Payload: ' UNION SELECT secret_key, NULL FROM key_table-- Key Takeaways for Prevention
Parameterized Queries: Never concatenate user input directly into SQL strings. Use prepared statements.
Input Validation: Implement allow-lists for expected input formats.
Principle of Least Privilege: Ensure the database user account running the application has no access to sensitive system tables like information_schema.
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.
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. sql+injection+challenge+5+security+shepherd+new
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.
The SQL Injection Challenge 5 in OWASP Security Shepherd is a "VIP Coupon Code" scenario where you must bypass a payment gate by injecting SQL into the coupon field to retrieve or validate a valid VIP code. 🎯 Objective Goal: Obtain a free "Troll" by applying a VIP coupon code.
Challenge: The application expects a valid coupon code to set the price to
. You must use SQL injection to trick the database into accepting an "always true" condition or revealing the valid code. 🛠️ Step-by-Step Walkthrough 1. Identify the Entry Point
Navigate to the "SQL Injection 5" challenge page. You will see a shopping interface for "Trolls" with a field for a Coupon Code. Entering a random string like TEST will result in an "Invalid Coupon" message. 2. Test for Vulnerability
Most Security Shepherd SQL challenges use double quotes (") or single quotes (') for string encapsulation. Try entering a single quote ' in the coupon field.
If the application returns a database error or behaves differently, it is likely vulnerable. 3. Craft the Bypass Payload
The goal is to make the WHERE clause of the underlying SQL query always return true. The suspected query looks like this:
SELECT coupon_code FROM coupons WHERE coupon_code = ′User_Input′SELECT coupon_code FROM coupons WHERE coupon_code = prime User_Input prime
To bypass this, use a classic OR tautology. The most common working payload for this specific challenge is: Payload: "" OR 1=1 (or '' OR 1=1) When injected, the query becomes:
SELECT * FROM coupons WHERE coupon_code = "" OR 1=1SELECT * FROM coupons WHERE coupon_code = "" OR 1=1 4. Execute and Retrieve Key Enter 1 (or any number ≥1is greater than or equal to 1 ) in the Quantity field for the Troll. Paste the payload "" OR 1=1 into the Coupon Code box. Click Place Order. Solving Security Shepherd: SQL Injection Challenge 5 If
The system will validate the "always true" condition, apply a discount, and display the Result Key. 🛡️ Why This Works
The injection breaks out of the intended data field and appends a new logical condition (OR 1=1). Since 1=1 is always true, the database returns the first available coupon record (the VIP one) regardless of what you typed before the OR. ✅ Result
The result is the Result Key displayed on the "Order Confirmation" screen. Copy this key and submit it to the Security Shepherd scoreboard to complete the challenge.
If you'd like to dive deeper into the source code of this challenge or need help with the SQL Injection Escaping level (which often follows this one), let me know!
SQL Injection 5 challenge in OWASP Security Shepherd is a practical exercise in bypassing modern input sanitisation techniques. Unlike earlier levels that might be vulnerable to simple ' OR 1=1 --
payloads, this challenge typically involves a scenario where common characters are escaped or filtered, requiring more creative exploitation. Core Objective The primary goal is to retrieve a VIP Coupon Code
to purchase a "troll" item without being charged, which subsequently reveals the session's result key. This simulates a real-world e-commerce vulnerability where sensitive pricing or discount logic can be manipulated through the database backend. Understanding the Vulnerability
In many versions of this challenge, the application attempts to protect itself by "escaping" single quotes (replacing
). Paradoxically, this security measure can be its downfall if not implemented correctly: The Escape Trap
: If the escaping function is applied globally, an attacker can input a backslash before a quote (e.g., The Bypass
: The application might escape the attacker's backslash, turning it into a literal backslash (
), which then leaves the subsequent single quote unescaped and active in the SQL command. The Payload : A common successful payload for this level is \' OR 1=1; -- or variations like
depending on whether the query uses single or double quotes. Exploitation Strategy To solve the challenge effectively, follow these steps: Identify the Injection Point couponCode
parameter in the purchase or check-out request is the most likely target. Analyse the Response
: Observe how the application handles different characters. If a single quote returns a generic error, try escaping it yourself to see if you can "break out" of the string literal. Automate for Efficiency
: For "blind" scenarios where data isn't directly echoed back, tools like
can be used to dump the database schema and retrieve the actual coupon codes. Final Execution : Once the VIP code is retrieved (e.g., via a UNION-based injection Assuming a default table name: Many try information_schema
), submit it in the coupon field with a quantity of at least one to trigger the "zero charge" logic and receive your key. Key Learnings This challenge highlights that denylisting
or simple string replacement is rarely a sufficient defence against SQL injection. Developers should instead use parameterised queries
or prepared statements, which separate the SQL command from the user-provided data entirely, ensuring that input is always treated as a literal value rather than executable code. step-by-step walkthrough
for a specific environment (like a VM or Docker), or would you like to explore defensive coding examples to prevent this specific type of escape bypass? SQL Injection Escaping Challenge Security Shepherd 29 Oct 2016 —
Unmasking the Coupon Code: A Deep Dive into OWASP Security Shepherd’s SQL Injection Challenge 5
In the realm of cybersecurity education, the OWASP Security Shepherd project stands as a cornerstone for hands-on learning, transforming abstract vulnerabilities into tangible puzzles. Among its tiered levels, SQL Injection Challenge 5 (often referred to as the "VIP Check" or "Coupon Code" challenge) represents a critical pivot point where basic logic meets more complex database structures. The Objective: Exploiting the "VIP" Shop
Unlike earlier lessons that might only require a simple ' OR '1'='1 to bypass a login, Challenge 5 immerses you in a mock e-commerce environment—a Super Meme Shop. The goal is simple yet daunting: purchase a high-value "key" without actually paying for it by uncovering a hidden VIP Coupon Code.
The application typically presents a field where users can search for or apply coupons. The underlying vulnerability lies in how this search query is constructed. If the application takes user input and directly concatenates it into a SQL statement, it opens a door for attackers to "inject" their own commands. The Attack Vector: Union-Based Injection
To solve Challenge 5, security researchers often employ a Union-Based SQL Injection. Since the standard search result displays coupon information, an attacker can use the UNION SELECT statement to append results from other tables—specifically internal database schema tables—to the visible output.
Determining Column Count: Attackers first use ORDER BY clauses to figure out how many columns the original query is returning.
Exploring the Schema: Once the column count is known, the information_schema.tables and information_schema.columns tables are queried to find where the "real" sensitive data is hidden.
Extracting the Coupon: By targeting a table often named something like coupons or vip_codes, the attacker forces the application to display the secret VIP code directly in the search results. Common Pitfalls and Technical Nuances
Students often encounter roadblocks in Challenge 5 due to its stricter validation compared to earlier levels: couponcode from challenges SQL injection 5 #323 - GitHub
Solving Security Shepherd: SQL Injection Challenge 5
If you are working your way through the OWASP Security Shepherd project, you have likely hit a wall at SQL Injection Challenge 5. By this stage, you’ve moved past the basics of ' OR 1=1 -- and are dealing with more complex filters or query structures.
This post breaks down the methodology to solve Challenge 5, moving from error analysis to successful data extraction.
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:
- 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). - Forgetting the LIMIT clause: Without
LIMIT 0,1,SUBSTRINGmight try to read multiple rows, causing a syntax error. - 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.
Step-by-Step Exploitation of Challenge 5
Let’s assume the underlying query is:
SELECT first_name, last_name FROM user_data WHERE user_id = ' + userInput + '