Sql Injection Challenge 5 Security Shepherd

While early challenges in Security Shepherd typically feature or Union-Based SQLi (where data or database errors are directly printed on the screen), Challenge 5 elevates the difficulty. It introduces a scenario where the application suppresses database error messages and does not directly mirror back the results of an injected query.

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Inputting a random string or a single character yields an empty result set or an error message stating that no entries were found. This confirms that the search functionality maps directly back to database records.

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:To use a UNION attack (which is often required for these challenges), you need to find the number of columns in the original query. Payload : ' UNION SELECT 1, 2, 3--

The resulting query has effectively bypassed the string context, and the OR 1=1 condition evaluates to true, returning all rows from the customers table. The double dash ( -- ) comments out the rest of the original query, including the closing quotation marks and any additional conditions.

SELECT coupon_code FROM coupons WHERE coupon_code = '\\' OR 1=1; -- '; Use code with caution. This link or copies made by others cannot be deleted

To perform a UNION SELECT , your injected query must have the same number of columns as the original query. We need to find this number.

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Submitting a standard string returns a "No results found" or invalid response. Submitting a classic payload like ' OR 1=1; -- fails because the application successfully escapes the standalone single quote, converting it into a harmless literal character string. 3. Deploy the Escaping Bypass Payload Try again later

The challenge forces the user to think about the specific application logic (the escaping function) and the underlying database engine (in this case, assumed to be MySQL). A security tester must understand how the application handles input and how the database interprets special characters to build effective attacks.

If you attempt a payload like admin' , the application turns it into admin\' , which often results in a "User not found" error because the database is literally searching for a user named admin' . Solving the Challenge: Step-by-Step 1. Analyze the Input and Behavior

It's important to note that in some Security Shepherd deployments, Challenge 5 is specifically the . This challenge is designed to teach you about the dangers of relying solely on escaping as a defense mechanism.

The focuses specifically on a VIP Coupon Verification system . The application presents an input field where users submit a VIP coupon code to purchase items (such as "Trolls") without being charged. The Vulnerable Code Mechanics