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# SSA-705517: Remote Code Execution Vulnerability in SIMATIC WinCC and SIMATIC PCS 7

Publication Date:        2019-05-14
Last Update:             2019-05-14
Current Version:         1.0
CVSS v3.0 Base Score:    9.8

SUMMARY
=======

A vulnerability was identified in SIMATIC WinCC and SIMATIC PCS 7, which
could allow an unauthenticated attacker with access to the affected
devices to execute arbitrary code. The vulnerability can be exploited if
the affected systems do not have "Encrypted Communication" enabled.

Siemens provides versions of SIMATIC WinCC and SIMATIC PCS 7, that allow
to enable a mode called "Encrypted Communication", which mitigates the
vulnerability.

"Encrypted communication" is enabled by default starting with SIMATIC
WinCC V7.5.


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


* SIMATIC PCS 7 V8.0 and earlier 
  - Affected versions:
       All versions
  - Remediation:
       Apply recommendations from Section Workarounds and Mitigations, or
       upgrade to a newer version and enable "Encrypted Communication"

* SIMATIC PCS 7 V8.1 and newer 
  - Affected versions:
       All versions
  - Remediation:
       Enable "Encrypted Communication"

* SIMATIC WinCC V7.2 and earlier 
  - Affected versions:
       All versions
  - Remediation:
       Apply recommendations from Section Workarounds and Mitigations, or
       upgrade to a newer version and enable "Encrypted Communication"

* SIMATIC WinCC V7.3 and newer 
  - Affected versions:
       All versions
  - Remediation:
       Enable "Encrypted Communication". Starting with WinCC V7.5 "Encrypted
       Communication" is enabled by default


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

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

* Apply Defense-in-Depth concept
  


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), 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 and other components.



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

The vulnerability classification has been performed by using the CVSS scoring
system in version 3.0 (CVSS v3.0) (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.


* Vulnerability CVE-2019-10922

  An attacker with network access to affected installations, which are
  configured without "Encrypted Communication", can execute arbitrary
  code.
  
  The security vulnerability could be exploited by an unauthenticated
  attacker with network access to the affected installation. No user
  interaction is required to exploit this security vulnerability. The
  vulnerability impacts confidentiality, integrity, and availability of
  the device.
  
  At the time of advisory publication no public exploitation of this
  security vulnerability was known.

  CVSS v3.0 Base Score: 9.8
  CVSS v3.0 Vector:     CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C


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

Siemens thanks the following parties for their efforts:

   * Vladimir Dashchenko and Sergey Temnikov from Kaspersky Lab ICS CERT 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 (2019-05-14): 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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