Remote File Inclusion
Remote File Inclusion (also known as RFI) is the process of including remote files through the exploiting of vulnerable inclusion procedures implemented in the application. This vulnerability occurs, for example, when a page receives, as input, the path to the file that has to be included and this input is not properly sanitized, allowing external URL to be injected. Although most examples point to vulnerable PHP scripts, we should keep in mind that it is also common in other technologies such as JSP, ASP and others.
Remote File Inclusion occurs when the URI of a file located on a different server is passed to as a parameter to the PHP function “include”, “include_once” , “require” or “require_once” . PHP incorporates the content into the pages. If the content happens to be PHP source code, PHP executes the file.
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