perfact::mpa Persistent Cross Site Scripting

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Advisory ID: SYSS-2015-066  
Product: 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 Scripting (CWE-79)  
Risk Level: High  
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)  
  
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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 improper input validation, the web application perfact::mpa is  
vulnerable to persistent cross-site scripting attacks.  
  
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Vulnerability Details:  
  
The SySS GmbH found out that different functions of the web application  
perfact::mpa are prone to persistent cross-site scripting attacks due to  
insufficient user input validation.  
  
This kind of attack enables an attacker to persistently store attack  
vectors in form of arbitrary code, for instance JavaScript code, in the  
web application database, which may be executed in the context of other  
users.  
  
1) Persistent Cross-Site Scripting via uploaded HTML files  
  
The SySS GmbH also found out that the file upload functionality for  
file attachments to remote sessions allows the upload of HTML documents  
containing JavaScript code which enables an attacker to perform  
persistent cross-site scripting attacks.  
  
  
2) Persistent Cross-Site Scripting via export report functionality  
  
Further examples for persistent cross-site scripting vulnerabilities  
were identified in the export report functionality (stored report) of  
many views providing this option that could be exploited via different  
parameters.  
  
According to test results of the SySS GmbH, all report views generated  
by the export report functionality are prone to persistent cross-site  
scripting attacks, if an attacker can control any of the displayed  
information, for example a description parameter.  
  
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Proof of Concept (PoC):  
  
1) Persistent Cross-Site Scripting via uploaded HTML files  
  
An authenticated user can upload an HTML file containing arbitrary  
JavaScript code as an attachment to a remote session.  
  
If this attached file is opened by another user within the perfact::mpa  
web application, the attacker-controlled JavaScript is executed in the  
context of the victim.  
  
  
2) Persistent Cross-Site Scripting via export report functionality  
  
If an attacker can control any of the displayed information of a stored  
report, she or he is able to execute JavaScript code in the context of  
other users that are viewing this report.  
  
For example, the following simple attack vector can be used as user   
description value of a user account:  
  
Test<script>alert(1)</script>  
  
  
The following output is an excerpt of the resulting HTML source code of  
the stored report generated by the export report functionality  
containing the injected JavaScript code:  
  
(...)  
<td class="export_as_text">Test<script>alert(1)</script></td>  
(...)  
  
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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.  
  
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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  
  
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References:  
  
[1] Product Web Site for perfact::mpa  
http://perfact.de/mpa/index_html  
[2] SySS Security Advisory SYSS-2015-066  
https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2015-066.txt  
[3] SySS Responsible Disclosure Policy  
https://www.syss.de/en/responsible-disclosure-policy/  
  
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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  
  
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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.  
  
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Copyright:  
  
Creative Commons - Attribution (by) - Version 3.0  
URL: http://creativecommons.org/licenses/by/3.0/deed.en  
  
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