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German Telekom Local File Inclusion

German Telekom Local File Inclusion
Posted Feb 27, 2014
Authored by Ibrahim El-Sayed | Site vulnerability-lab.com

The German Telekom website suffered from a local file inclusion vulnerability.

tags | exploit, local, file inclusion
MD5 | 49cd97e0f2713a515fe83d852b069dc0

German Telekom Local File Inclusion

Change Mirror Download
Document Title:
Telekom Bug Bounty #12 - File Include Web Vulnerability

References (Source):

Release Date:

Vulnerability Laboratory ID (VL-ID):

Common Vulnerability Scoring System:

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:

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

Exploitation Technique:

Severity Level:

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
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:
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:
we can change the vulnerable link to be:

Another way to include the same image is:

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
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
Content-Type: application/x-www-form-urlencoded

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>
<font face="Arial" size=2>[Microsoft][ODBC SQL Server Driver][SQL Server]Kein
schlie├čendes Anf├╝hrungszeichen nach der Zeichenfolge '');'.</font>
<font face="Arial" size=2>
/englishtest2004/test.asp</font><font face="Arial" size=2>, line 23</font>



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:
The information provided in this advisory is provided as it is without any warranty. Vulnerability Lab disclaims all warranties,
either expressed or implied, including the warranties of merchantability and capability for a particular purpose. Vulnerability-
Lab or its suppliers are not liable in any case of damage, including direct, indirect, incidental, consequential loss of business
profits or special damages, even if Vulnerability-Lab or its suppliers have been advised of the possibility of such damages. Some
states do not allow the 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, policies, deface websites, hack into databases
or trade with fraud/stolen material.

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