Welcome to the third course in the OWASP Top 10 series! 🛡️ In this course, we'll explore injection vulnerabilities, one of the most prevalent and dangerous security risks in modern web applications. Injection attacks occur when untrusted data is sent to an interpreter as part of a command or query, leading to unintended execution of malicious code.

At its core, injection vulnerabilities arise when an application fails to properly validate, filter, or sanitize user-supplied input before using it in operations that interpret and process that input. This could be anything from database queries to system commands, from file operations to template engines. The fundamental problem is that the application fails to establish a clear boundary between data and code, allowing attackers to inject malicious commands that the interpreter will execute.

Think of it like giving someone directions to your house. If you blindly follow whatever they say without questioning it, they might lead you somewhere dangerous. Similarly, when an application blindly trusts and executes user input, it can be led to perform unintended and potentially harmful operations. Attackers can craft special inputs that break out of the intended data context and inject commands that the interpreter will execute with the same privileges as the application itself.

Injection vulnerabilities remain at the top of the OWASP Top 10 list because they are both common and potentially devastating. When exploited, these vulnerabilities can lead to:

• Data theft through unauthorized database access
• System compromise via command execution
• Application manipulation through code injection
• Service disruption through malicious queries

These vulnerabilities don't just affect databases—they can target any system that interprets and processes user input, including operating system commands, file systems, and APIs.

Throughout this course, you'll learn how to identify and fix various types of injection vulnerabilities using a our dummy pastebin application. You will:

• Prevent SQL Injection in search features through parameterized queries
• Secure against Template Injection in content rendering components
• Implement Safe Command Execution in file processing operations
• Master Prevention Techniques including input validation, output encoding, and security headers

By the end of this course, you'll understand how to properly validate and sanitize user input to prevent injection attacks in your applications.

In the next lesson, we'll explore SQL injection vulnerabilities in search functionality, a common attack vector where malicious actors can manipulate database queries. You'll learn how to identify vulnerable endpoints and implement proper input validation and parameterized queries to protect your application's data.

Let's begin our journey into securing applications against injection attacks! 🚀