Code injection is the embedding of code into software, which disturbs the functioning of the software. The code introduced to the software can disturb the database integrity, security, features, etc. This article will discuss various aspects of code injection attacks, including their meaning, working, examples, and code injection examples.
In simple terms, code injection is injecting malicious code into an application, which results in a malicious attack. There is command injection as well, but it is different from command injection. Code injection is limited to the functionality of a particular code. For instance, if PHP injections occur in an application, it will only affect the functions brought to that application by that particular language.
Given below is the code injection example-
<?PHP eval (“echo “/$_REQUEST[“user_name”].”;); ?>
In the above code, the PHP will evaluate everything that is passed to the parameter username. There should be a valid username for the query string. An example of this is-
Now in this code, the attacker can exploit the application by injecting a PHP code-
Now, after this injection, the PHP injector will echo admin. After that, phpinfo() will be executed. The information will be provided to the attacker after the code successfully runs. Details and information such as PHP version, operating system, and configuration details will be given to the attacker.
Code injection can only use the function only if the system() is disabled in the PHP interpreter settings. Then for the Linux-based server, the following URL is supplied.
This will also echo the domain. The code, which is present after the semicolon, i.e., system(‘ls-l’), will be executed. In the above command, the system(‘ls-l’) will run the ls-l command.
When an application lacks proper input validation, i.e., it does not sanitize the data stored, then that application is vulnerable to code injection. Before talking about working, let’s discuss what user input is. In simple terms, any data which is fed by the user in the application is called user input, which is to be then processed by the application. The developers design the application only to accept certain input types. The application on which the code is being injected expects specific types of input. In some cases, the developer might show negligence when it comes to ensuring the correct data fed to the application.
Various applications are prone to code injection attacks. eval() code is used for the code injection. The attacker exploits the application by injecting the code as the user input. Once the attack is successful, the attackers get access to the system information and the database.
These were some of the most common code injection that can be seen online.
There are various ways to prevent code injection. Given below are some tips to help with the prevention of code injection.
These affect only the particular type of functionality, which is only provided by the particular code. This article discusses the various aspects of code injection. Reading this article will help you learn what code injection is and how it is implemented. This is explained with the example of the code injection. This article also explains the various methods to help prevent code injections, and how dangerous it can be for your system and data.
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