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Loading...Introduction to Web Application Security
When I first started working on web applications, I was surprised by how often security vulnerabilities would slip through the cracks. Last quarter, our team discovered a critical issue in our login system that could have been exploited by attackers. Here's what I learned when we dug deeper into the problem.
The Problem: SQL Injection
One of the most common vulnerabilities we encountered was SQL injection. This occurs when an attacker is able to inject malicious SQL code into a web application's database, allowing them to extract or modify sensitive data. I realized that our application was vulnerable to SQL injection because we weren't properly sanitizing user input.
Example of SQL Injection
For example, consider a simple login form that takes a username and password as input. If an attacker enters a malicious username like Robert'); DROP TABLE Students; --, the application might execute the following SQL query:
SELECT * FROM users WHERE username = 'Robert'); DROP TABLE Students; --' AND password = 'password
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