German Telekom Bug Bounty #10 - Arbitrary File Upload Vulnerability Feb 06 2014 01:33PM
Vulnerability Lab (research vulnerability-lab com)
Document Title:
German Telekom Bug Bounty #10 - Arbitrary File Upload Vulnerability

References (Source):

Dev Article: http://www.vulnerability-db.com/dev/index.php/2014/02/06/german-telekom-

Exclusive News: http://news.softpedia.com/news/Expert-Finds-SQL-Injection-and-RCE-Vulner

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 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:

Affected Product(s):
Deutsche Telekom (German Telecom)
Product: Profil Bild Online Service - Web Application 2014 Q1

Exploitation Technique:

Severity Level:

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
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=rd10o00000000000000000000ffffac1c0a2fo8
Connection: keep-alive
Content-Type: multipart/form-data;
Content-Length: 10355

Content-Disposition: form-data; name="MAX_FILE_SIZE"

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 (ibrahim (at) evolution-sec (dot) com [email concealed]) [www.vulnerability-lab.com]

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