Code Injections (such as SQL Injections and command injections) are attacks that inject code into a server or database to unexpectedly execute commands or to insert malware. The most common form of Code Injection a hacker will use is to use special command line characters in a normal user input box to trick the server into executing the following command. This vulnerability is used for a wide range of malicious activity, which makes it particularly dangerous. These commands can be injected through any average text input box. The most effective way to prevent Code Injection is to create secure user input validation (such as a whitelist that allows only “innocent” characters, like letters and numbers), and to implement a secure firewall.
