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# SSA-944678: Potential Password Protection Bypass in SIMATIC WinCC

Publication Date:        2021-02-09
Last Update:             2021-02-09
Current Version:         1.0
CVSS v3.1 Base Score:    6.2

SUMMARY
=======

A vulnerability in the SIMATIC WinCC Graphics Designer tool could allow
an attacker that has physical access to a machine running the software
to get access to the user's private password-protected pictures.

Siemens has released an update for SIMATIC WinCC and recommends to
update to the latest version. Siemens recommends specific
countermeasures for PCS 7 as the affected feature is not officially
supported.


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


* SIMATIC PCS 7 
  - Affected versions:
       All versions
  - Remediation:
        See recommendations from section Workarounds and Mitigations

* SIMATIC WinCC 
  - Affected versions:
       All versions < V7.5 SP2
  - Remediation:
       Update to V7.5 SP2 or later version
  - Download:
       https://support.industry.siemens.com/cs/ww/en/view/109783853/


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

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

* Tailor user privileges to each user's specific needs (need-to-know
principle)
  
* Limit access to the affected products by implementing strict access
control mechanisms
  
* Specific for PCS 7:

- -   The affected WinCC-feature is not officially supported and not used
    by PCS 7. We recommend not to use it and apply the measures
    described in SIMATIC PCS 7 Compendium Part F.
  


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
===================

SIMATIC WinCC is a supervisory control and data acquisition (SCADA)
system.

SIMATIC PCS 7 is a distributed control system (DCS) integrating SIMATIC
WinCC, SIMATIC Batch, SIMATIC Route Control, OpenPCS7 and other
components.

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-2020-10048

  Due to an insecure password verification process, an attacker could
  bypass the password protection set on protected files, thus being
  granted access to the protected content, circumventing authentication.

  CVSS v3.1 Base Score: 6.2
  CVSS Vector:          CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C
  CWE:                  CWE-288: Authentication Bypass Using an Alternate Path or Channel


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

Siemens thanks the following parties for their efforts:

   * Enrique Murias Fernandez from Tecdesoft Automation for reporting the vulnerability



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 (2021-02-09): 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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