-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 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) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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> (...) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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-2015-066 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/ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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 -----BEGIN PGP SIGNATURE----- iQIcBAEBCgAGBQJW0+/3AAoJENmkv2o0rU2r8noQAJ4ZCybGIXu8JHN1yOYuPxX2 NWCFWqtwjm3E8iAP2jHaB63ps0HBFKzYXiRWAB6/Uk8hBnorwjQjkRQCY/evyjLH HVk5Tvukr5bZqHnkUGLwed3Xz/jnVZlaeb/OMU7fQASDS06v/LxILkqIvBp577GM lV6NKWHZgMz57ObADtJY6ffIJCNKYf+uPbECdMkpACsWKn2Kbh6l8xNARULh6yu3 AIIj8MJmJrYrph0V1tnyDXUtV++iFfO4YdqwI0WLPvEbmjOUEVbGtkzSdEgTfl9X rN4Zmh9mcvdyhOMO0S+0w+4YgqXwmX6oqucMlAAQWc/8Wh95GP2oIuW6mjAKylIo hNCFSmpctvXAbWINJLbC0rerCS8t+iEOkWZmkEyW6AIboEamwcebZ9N9/IFOYQcZ tOhLdNqW5ltxpfKrbvFxAokh7Rvl1Up2gBNJWyDVHcYU+nQiecieHLiS1IGNoq5T BTWcxw2KZRal750KKlMGM3kso3p9S0X/PIk7uDmPesdddOyAi+qTzMn6IZVh6tX3 FTSNrlIHrQu5t3cOsQ9Gq6R5KjbHA+1jqq2X5SvCkKDuDX2HfSit7wi4lr0LEKeD X7+m4dYxFSZ1K5quegV1Dqt4dMKURsrvnzabBDNwQc2pnepdNaxTG2ZZP/q1H2GT pnWUhWJloSq3AungqknK =FHIW -----END PGP SIGNATURE-----