Date: Mon, 29 Feb 2016 14:29:47 GMT
From: matthias.deeg@...s.de
To: bugtraq@...urityfocus.com
Subject: [SYSS-2015-071] perfact::mpa - Cross-Site Request Forgery

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Advisory ID: SYSS-2015-071
Product(s): perfact::mpa
Manufacturer: PerFact Innovation GmbH & Co. KG
Affected Version(s): Custom versions using PerFact DB_Utils (Toolkit) < v3.2
Tested Version(s): Custom version with PerFact DB_Utils (Toolkit) < v3.2
Vulnerability Type: Cross-Site Request Forgery (CWE-352)
Risk Level: Medium
Solution Status: Fixed
Manufacturer Notification: 2015-12-18
Solution Date: 2016-01-18
Public Disclosure: 2016-02-29
CVE Reference: Not yet assigned
Authors of Advisory: Matthias Deeg and Sven Freund (SySS GmbH)

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Overview:

The software solution perfact::mpa is a software architecture that, for
instance, is used to build web applications for the secure and reliable
remote maintenance of machines via the Internet (see [1]).

According to the manufacturer, remote control software built with
perfact::mpa impresses through the following features:

* location-independent and central monitoring,
* maintenance and error management,
* authorized remote access, and
* integrated documentation of incidents and services.

Due to missing protection mechanisms, the web application perfact::mpa
is vulnerable to cross-site request forgery (CSRF) attacks.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Vulnerability Details:

The tested web application perfact::mpa offers no protection against
cross-site request forgery (CSRF) attacks. This kind of attack forces
end users respectively their web browsers to perform unwanted actions
in a web application context in which they are currently authenticated.

CSRF attacks specifically target state-changing requests, for example in
order to enable or disable a feature, and not data theft, as an attacker
usually has no possibility to see the response of the forged request.

In general, CSRF attacks are conducted with the help of the victim, for 
example by a user visiting an attacker-controlled URL sent by e-mail in 
its web browser. Often, cross-site request forgery attacks make use of 
cross-site scripting attacks, but this is not mandatory.

CSRF attacks can also be performed against a web application if a victim
is only visiting an attacker-controlled web server. In this case, the
attacker-controlled web server is used to generate a specially crafted
HTTP request in the context of the user's web browser which is then sent
to the vulnerable target web application.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Proof of Concept (PoC):

The SySS GmbH could successfully demonstrate a CSRF attack against the
perfact::mpa web application by using the found persistent cross-site
scripting vulnerability in the file upload functionality (see 
security advisory SYSS-2015-066).

The following JavaScript attack vector was used which was automatically
executed when the uploaded attacker-controlled HTML file was opened by a
victim.

<script>location.href="https://<HOST>/<PATH>/MPA2/External/ExtAdmin/db_edit_action
?layout_tabnum=&id=&selector_copy_from=&do_delete=&delete_next_id=&do_save=Speichern
&name=<NAME>&random_password=<PASSWORD>&password=<PASSWORD>&password_repeat=<PASSWORD>
&fullname=<FULL_NAME>&email=<EMAIL>&phone=&passwordexpires=
&passwordexpires_date=&passwordexpires_time=&disabled%3Adefault=";</script>

If this attack vector was executed in the context of a perfact::mpa
system administrator, a new external administrator with the defined
account data would be created.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Solution:

According to information by the PerFact Innovation GmbH & Co. KG, the
described security issue has been fixed in PerFact DB_Utils (toolkit)
software version 3.2.

Please contact the manufacturer for further information or support.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Disclosure Timeline:

2015-12-18: Vulnerability reported to manufacturer
2016-01-18: Response from manufacturer with detailed information about
            the reported security vulnerability and its solution status
2016-02-05: E-mail to manufacturer according two open questions
2016-02-05: Response from manufacturer with further information
2016-02-29: Public release of security advisory

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

References:

[1] Product Web Site for perfact::mpa
    http://perfact.de/mpa/index_html
[2] SySS Security Advisory SYSS-2015-071
    https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2015-071.txt
[3] SySS Responsible Disclosure Policy
    https://www.syss.de/en/responsible-disclosure-policy/

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Credits:

This security vulnerability was found by Matthias Deeg and Sven Freund
of the SySS GmbH.

E-Mail: matthias.deeg (at) syss.de
Public Key: https://www.syss.de/fileadmin/dokumente/Materialien/PGPKeys/Matthias_Deeg.asc
Key fingerprint = D1F0 A035 F06C E675 CDB9 0514 D9A4 BF6A 34AD 4DAB

E-Mail: sven.freund (at) syss.de
Public Key: https://www.syss.de/fileadmin/dokumente/Materialien/PGPKeys/Sven_Freund.asc
Key fingerprint = DCDB 7627 C1E3 9CE8 62DF 2666 8A5F A853 415D 46DC

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Disclaimer:

The information provided in this security advisory is provided "as is" 
and without warranty of any kind. Details of this security advisory may 
be updated in order to provide as accurate information as possible. The
latest version of this security advisory is available on the SySS Web 
site.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Copyright:

Creative Commons - Attribution (by) - Version 3.0
URL: http://creativecommons.org/licenses/by/3.0/deed.en

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