Similarly, if the user prefers Italian the file that will be served is Italian.php.īut we know that those functions are user controlled, meaning that the language preference - in this case - is provided by the user. If the user chooses English, the file that will be returned is English.php. Let’s now suppose that a web application supports English, Italian and Swedish. Supposing that the user prefers English, the application will go and request the file in which its contents are displayed in English. A possible way to achieve this - especially at non-advanced applications - is by asking the user for a language preference. We can see such functions on applications like Facebook, Google, Twitter and more. Most of the corporate web sites are served in various languages so that people from different countries can understand the contents of the page. The problem occurs when those inclusion functions are poorly-written and controlled by users. Those are scenarios we encounter daily on Web Applications. Similarly, the application might need to load text files, or any type of file, available to other locations. For example, there might be a need to load and evaluate PHP code from another file that is located to a different location. Many times, when developing web application software, it is required to access internal or external resources from several points of the application. As most web application vulnerabilities, the problem is mostly caused due to insufficient user input validation.
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