Making A SQLi Lab Is Not Difficult, Build One With Me.

The article provides a detailed guide on how to create a SQL Injection (SQLi) lab for educational purposes. It walks through the process of setting up a vulnerable web application that can be exploited using SQL injection techniques. Here's a summary of key points:

1. Setting Up the Environment:

   • The author uses Node.js with Express and SQLite as the database.
   • Dependencies include express, jsonwebtoken, and nodemon.

2. Creating the Vulnerable Code:

   • A POST request to /login is created where user credentials are directly inserted into a SQL query without proper sanitization or parameterized queries.
   • Example of vulnerable code:

     javascript
      
     1const query = `SELECT * FROM users WHERE username = '${username}' AND password = '${password}'`;

3. Exploiting the Vulnerability:

   • By entering ' OR '1'='1 as the password, an attacker can bypass authentication.
   • Another example payload is admin' --, which comments out the rest of the query.

4. Challenge:

   • The challenge involves using UNION-based SQL injection to retrieve data from a different table.
   • Example:

     javascript
      
     1undefined

Read the full article at InfoSec Write-ups - Medium

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