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# SSA-226339: Multiple Web Application Vulnerabilities in Desigo Insight

Publication Date:        2020-10-13
Last Update:             2020-10-13
Current Version:         1.0
CVSS v3.1 Base Score:    5.4

SUMMARY
=======

The latest hotfix for Desigo Insight fixes three vulnerabilities that
have been identified in the web server, including SQL injection
(CVE-2020-15792), clickjacking (CVE-2020-15793), and full path
disclosure (CVE-2020-15794).

Siemens recommends updating to the latest version of Desigo Insight and
to apply the hotfix.


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


* Desigo Insight 
  - Affected versions:
       All versions
  - Remediation:
       Update to V6.0 SP5 and apply Hotfix 2 or later
  - Download:
       https://support.industry.siemens.com/cs/ww/en/view/109781922


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

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

* Disable Desigo Insight Web, if not used. Alternatively, restrict the
access to allow only authorized users to access the web application
  
* CVE-2020-15793: Only access links from trusted sources in the browser
you use to access Desigo Insight Web
  


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

As a general security measure Siemens strongly recommends to protect
network access to affected products with appropriate mechanisms. It is
advised to follow recommended security practices in order to run the
devices in a protected IT environment.

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

Desigo Insight is the BACnet management station of the Desigo building
automation and control system that works with the automation stations
Desigo PX, Desigo TRA (Total Room Automation) and BACnet third-party.

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-2020-15792

  The web service does not properly apply input validation for some query
  parameters in a reserved area.
  
  This could allow an authenticated attacker to retrieve data via a
  content-based blind SQL injection attack.

  CVSS v3.1 Base Score: 4.3
  CVSS Vector:          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C
  CWE:                  CWE-89: Improper Neutralization of Special Elements used in an SQL Command ('SQL
Injection')

* Vulnerability CVE-2020-15793

  The device does not properly set the X-Frame-Options HTTP Header which
  makes it vulnerable to Clickjacking attacks.
  
  This could allow an unauthenticated attacker to retrieve or modify data
  in the context of a legitimate user by tricking that user to click on a
  website controlled by the attacker.

  CVSS v3.1 Base Score: 5.4
  CVSS Vector:          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N/E:P/RL:O/RC:C
  CWE:                  CWE-1021: Improper Restriction of Rendered UI Layers or Frames

* Vulnerability CVE-2020-15794

  Some error messages in the web application show the absolute path to the
  requested resource.
  
  This could allow an authenticated attacker to retrieve additional
  information about the host system.

  CVSS v3.1 Base Score: 4.3
  CVSS Vector:          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C
  CWE:                  CWE-200: Exposure of Sensitive Information to an Unauthorized Actor


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

Siemens thanks the following parties for their efforts:

   * Davide De Rubeis, Damiano Proietti, Matteo Brutti, Stefano Scipioni, and
Massimiliano Brolli from TIM Security Red Team Research 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 (2020-10-13): 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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