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# SSA-436520: XSS and CSRF Vulnerabilities in Polarion Subversion Webclient

Publication Date:        2020-09-08
Last Update:             2020-09-08
Current Version:         1.0
CVSS v3.1 Base Score:    8.1

SUMMARY
=======

Multiple cross-site scripting (XSS) vulnerabilities were found in the
subversion webclient of Polarion. In addition, the webclient doesn't
have any cross-site request forgery (CSRF) protection. An attacker could
inject client side script to induce the victim to issue an HTTP request
that would lead to a state changing operation. Siemens recommends
specific countermeasures as there are currently no fixes available.


AFFECTED PRODUCTS AND SOLUTION
==============================


* Polarion Subversion Webclient 
  - Affected versions:
       All versions
  - Remediation:
       The tool is considered shareware, distributed "as is" and there will not
       be a fix as it is no longer supported


WORKAROUNDS AND MITIGATIONS
===========================

Siemens has identified the following specific workarounds and mitigations that
customers can apply to reduce the risk:

* Do not open unknown links while working on Polarion Subversion webclient
  


GENERAL SECURITY RECOMMENDATIONS
================================

As a general security measure, Siemens strongly recommends to protect
network access to devices with appropriate mechanisms. In order to
operate the devices in a protected IT environment, Siemens recommends to
configure the environment according to Siemens' operational guidelines
for Industrial Security (Download:
https://www.siemens.com/cert/operational-guidelines-industrial-security),
and to follow the recommendations in the product manuals.

Additional information on Industrial Security by Siemens can be found
at: https://www.siemens.com/industrialsecurity

PRODUCT DESCRIPTION
===================

Polarion WebClient for SVN, one of several free Subversion tools from
Polarion Software, is a SVN client that enables Subversion users to work
with SVN repositories using a web browser.

VULNERABILITY CLASSIFICATION
============================

The vulnerability classification has been performed by using the CVSS scoring
system in version 3.1 (CVSS v3.1) (https://www.first.org/cvss/). The CVSS 
environmental score is specific to the customer's environment and will impact
the overall CVSS score. The environmental score should therefore be 
individually defined by the customer to accomplish final scoring.

An additional classification has been performed using the CWE classification, a
community-developed list of common software security weaknesses. This serves as
a common language and as a baseline for weakness identification, mitigation,
and prevention efforts. A detailed list of CWE classes can be found at:
https://cwe.mitre.org/.



* Vulnerability CVE-2020-15788

  The Polarion subversion web application does not filter user input in a
  way that prevents Cross-Site Scripting.
  
  If a user is enticed into passing specially crafted, malicious input to
  the web client (e.g. by clicking on a malicious URL with embedded
  JavaScript), then JavaScript code can be returned and may then be
  executed by the user's client.
  
  Various actions could be triggered by running malicious JavaScript code.

  CVSS v3.1 Base Score: 6.1
  CVSS Vector:          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:P/RL:U/RC:C
  CWE:                  CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic
XSS)

* Vulnerability CVE-2020-15789

  The web interface could allow a Cross-Site Request Forgery (CSRF) attack
  if an unsuspecting user is tricked into accessing a malicious link.
  
  Successful exploitation requires user interaction by a legitimate user,
  who must be authenticated to the web interface. A successful attack
  could allow an attacker to trigger actions via the web interface that
  the legitimate user is allowed to perform. This could allow the attacker
  to read or modify contents of the web application.

  CVSS v3.1 Base Score: 8.1
  CVSS Vector:          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N/E:P/RL:U/RC:C
  CWE:                  CWE-352: Cross-Site Request Forgery (CSRF)


ACKNOWLEDGMENTS
===============

Siemens thanks the following parties for their efforts:

   * Li Yifan from Bolean Technology LTD. for coordinated disclosure



ADDITIONAL INFORMATION
======================

For further inquiries on security vulnerabilities in Siemens products and 
solutions, please contact the Siemens ProductCERT:

https://www.siemens.com/cert/advisories


HISTORY DATA
============

V1.0 (2020-09-08): Publication Date

TERMS OF USE
============

Siemens Security Advisories are subject to the terms and conditions contained
in Siemens' underlying license terms or other applicable agreements previously
agreed to with Siemens (hereinafter "License Terms"). To the extent applicable
to information, software or documentation made available in or through a
Siemens Security Advisory, the Terms of Use of Siemens' Global Website
(https://www.siemens.com/terms_of_use, hereinafter "Terms of Use"), in
particular Sections 8-10 of the Terms of Use, shall apply additionally. In case
of conflicts, the License Terms shall prevail over the Terms of Use.
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