The application would execute both commands and return the output to the user.Īlso, the attacker doesn't even need to view the output of the command. In Linux systems, you can use the (semicolon) command for the same behavior. However, if a malicious user suspects there's a vulnerability, they can overload the application's system command by appending their own command at the end.įor example, in a DOS command shell on Windows, you can use the & (ampersand) character to append a command. Assuming the input is valid and the user isn't malicious, the system just returns the output of the system command back at the user. The expected flow of the system accepts user input and uses it as part of a system command. So, a command injection can potentially be a lot more damaging.
![pug template injection pug template injection](https://cdn-ak.f.st-hatena.com/images/fotolife/y/yuji-matsunaga/20170602/20170602174338.png)
In a command injection attack, on the other hand, the underlying OS is targeted. But the attack would (usually) be limited to the scope of the browser.
#Pug template injection code#
For example, a front-end JavaScript code injection attack might have the browser execute some arbitrary code on the user's browser. That type of attack is mainly concerned with subverting the application context itself. Note that a command injection is different from a code injection attack. This input can come from any user-modifiable source, such as forms, cookies, HTTP headers, and so on. The goal of a command injection attack is to manipulate a legitimate command so that the attacker can run arbitrary commands against the operating system. These vulnerabilities can happen when an application accepts unsafe user input and uses it as a parameter for operating system commands. What Is a Command Injection Vulnerability? Let's start by learning a little bit more about command injection vulnerabilities. We'll also explore a few techniques we can use to better protect ourselves from these types of attacks. In this post, we'll learn about command injection vulnerabilities when working with shell command functions in NodeJS.
![pug template injection pug template injection](https://images-na.ssl-images-amazon.com/images/I/61LWqosmKUL._AC_UY675_.jpg)
If your application isn't secured effectively, then each of these environments can pose as a unique attack surface for exploiting command injection vulnerabilities. They can have multiple moving parts spread across many environments. Modern websites can be complex pieces of software.