Remote Code Execution(RCE) Vulnerability

The complexity of Web is changing daily and its scope is growing very fast, especially with 3D rendering

What is Remote Code Execution Vulnerability?

Remote code execution is a vulnerability that can be exploited if user input is injected into a file or a string and executed (evaluated) by the programming language’s parser. Usually this behavior is not intended by the developer of the web application and also web server. The vulnerability occurs if you allow user input inside functions that are executing the code in the respective programming language. This can be implemented on purpose For example if you have generated a variable for every user and store their id since the username is generally user controlled input an attacker can manipulate the input by writing next to php command so he could assign the value to variable and execute the command Unlike this example this method doesn’t depend on any specific language function, but on fact that specific files are parsed by the language’s interpreter for example this would be in a configuration file that is included in the web application. Ideal case you should avoid using user input inside files that are executed by an interpreter as this can lead to unwanted and dangerous behavior. This kind of exploit technique is often seen in combination with an upload functionality the doesn’t do the sufficient checks on file types and extensions. Another example if you are trying to develop a web application with a control panel for every user and the control has some settings about user specifications like name, age,…etc all these are saved in a variables. So on sending the request to change the variable he could penetrate these stream and adjust the input to have arbitrary code beside the input . where the server would respond to both cases

How to avoid Remote Code Execution ?

First of all you should avoid using user input inside executed code. The best option to not let user decide the extension or content of files on the web server and use safe practices for secure file uploads, second you should run intrusion detection systems(IDSs) to detect any malicious activity, third you should take care of your inputs to system like not allowing malicious characters and last you could restrict permitted commands which is the base of vulnerability by this it won’t permit the attacker to access the system

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Hisham Elreedy is Digital Electronics Engineer, Graphics Designer, Blogger, Youtuber. Inspired to teach all he knows from his experience in studying undergraduate engineering by creating useful posts

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