Detecting and exploiting command injection vulnerabilities

We have seen before how PHP's system() can be used to execute operating system commands in the server; sometimes, developers use instructions such as that, or others with the same functionality, to perform certain tasks. Sometimes, they use unvalidated user input as parameters for the execution of commands.

In this recipe, we will exploit a command injection vulnerability and extract important information from the server.

How to do it...

Log into DVWA and go to Command Execution:

1. We will see a Ping for FREE form. Let's try it! Ping to 192.168.56.10 (our Kali Linux machine's IP):

That output looks like it was taken directly from the ping command&apos...