How to fix - Local File Injection (LFI)

Local File Injection (LFI) is a type of web application vulnerability that allows an attacker to read sensitive files on the web server. This can include configuration files, log files, and even source code. LFI can occur when an application takes user-supplied input and uses it to construct a file path without properly validating or sanitizing the input.

To fix LFI, the web application should properly validate and sanitize user-supplied input. This can include limiting the types of characters that can be used in the input, and checking that the input corresponds to an existing file. Additionally, sensitive files should be stored outside of the web root, so that they are not accessible via the web server.

Another way to fix LFI is by using a whitelist of accepted input, which only allows specific characters or strings to be passed to the file path.

In addition, it is important to keep the web server and web application software up-to-date, as many LFI vulnerabilities are discovered and patched by software vendors.

It is also important to use security best practices and perform regular security assessments to identify and remediate vulnerabilities in the application.