Sql Injection Challenge 5 Security Shepherd -

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''1''' at line 1

If we get an error at 4, the original query is selecting .

When code handles User_Input as raw text instead of a distinct parameter, the application accidentally allows users to reshape the logic of the Structured Query Language (SQL) engine. 🔑 Step-by-Step Walkthrough & Exploitation

More importantly, you internalize a crucial truth of security: Whether you are a blue teamer fixing vulnerabilities or a red teamer testing defenses, the lessons of Challenge 5 will serve you on every engagement.

Behind the scenes, the database runs a query structured like this: SELECT * FROM coupons WHERE code = 'USER_INPUT'; Use code with caution. Sql Injection Challenge 5 Security Shepherd

The application code likely constructs a query like this:

In previous SQLi challenges in Security Shepherd, basic payloads often work. Challenge 5 is designed to simulate a scenario where the application attempts to prevent SQL injection by escaping single quotes ( ' ).

Use ORDER BY to find the number of columns. 1' ORDER BY 1-- (Works) 1' ORDER BY 2-- (Works) 1' ORDER BY 3-- (Breaks? Then there are 2 columns) Identify Data Types: Test which columns display text. Extract Data: Use UNION to select database information:

: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-- You have an error in your SQL syntax;

Because the database engine reads left-to-right, the first backslash escapes the second backslash ( \\ →right arrow

The parameter is vulnerable to Boolean-based blind SQL injection. The server executes our injected logic alongside the original query.

The flaw in the backend logic of is that it indiscriminately adds an escaping backslash to every single quote, even if that single quote is already preceded by a backslash. This structural oversight changes the logic entirely: The developer's function scans user input for ' . It replaces it with \' .

The key difference in this challenge is often the lack of verbose SQL error messages. Unlike the "Low" or "Medium" challenges where syntax errors might reveal the database structure, Challenge 5 often implements a "Silent" error handling mechanism. If your SQL syntax is wrong, the page simply returns nothing or a generic error, rather than a database stack trace. Behind the scenes, the database runs a query

If an attacker passes \' explicitly, the filter processes the single quote and turns it into \\\' .

Manipulate the parameter (e.g., id=1 ) to see how the application behaves. 3. Exploiting with UNION-Based SQLi

SUBSTRING(..., 1, 1) : This grabs the very first character of that targeted string.

If you want, I can in that style for Challenge 5, including a blind SQL injection script. Would that help?

This script solves Challenge 5 in seconds. But understanding why it works is what makes you a security professional.

OWASP Security Shepherd's SQL Injection Challenge 5 focuses on Boolean-based Blind SQL Injection, requiring users to extract hidden data by inputting TRUE/FALSE queries to infer information. Attackers exploit this by analyzing application responses to guess characters one-by-one using SQL functions like SUBSTRING()