PHP Local File Inclusion

title: Local File Inclusion

Local File Inclusion

A vulnerability in the application caused by the programmer requiring a file input provided by the user and not sanitizing the input before accessing the requested file. This results in a file being included where it should not of been.

Example local file inclusion attacks

A website allows you to view PDFs as download.php?file=myfile.php, due to a lack of proper checking a malicious user is able to request /etc/passwd and get sensitive configuration information from the web server.

Defending your website from local file inclusion attacks in PHP

<?php if(basename($_GET['file]) !== $_GET['file']) { die('INVALID FILE REQUESTED'); }

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