Web Attacks: Command Injection

Here are the initial instructions and explanation of the lab environment. Read this while your environment is busy creating itself from nothing. Yes, this violates physics; we know. How fun!

In this challenge, you will interface with a web API and exploit a simple command injection vulnerability. You will execute commands on a remote system via the web API.

In this challenge, you will encounter a naive blocklist which will prevent you from using the simple command injection approach taken in the previous challenge. However, you will learn that there are a number of different ways to achieve the same command injection result which can be used to bypass a naive blocklist. Furthermore, you will learn how to execute commands with spaces, even when spaces are not directly permitted as an input.

In this challenge, you will encounter a more restrictive blocklist which will prevent you from using the simple command injection approach taken in the previous challenges. You will learn additional techniques and approaches to bypassing blocklists and ultimately executing arbitrary commands on the remote system.

Welcome to the final challenge! This is your last chance to experiment in the environment. Clicking Finish Lab will end this little world that flittered into existence just for you.