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# SSA-523365: Vulnerability in SIMATIC PCS 7

Publication Date:        2017-10-18
Last Update:             2018-06-12
Current Version:         1.1
CVSS v3.0 Base Score:    4.9

SUMMARY
=======

The latest software update for SIMATIC PCS 7 fixes a vulnerability,
which could allow an attacker to cause a Denial-of-Service (DoS)
condition under certain circumstances.


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


* SIMATIC PCS 7 V8.1 
  - Affected versions:
       All versions < V8.1 SP1 with WinCC V7.3 Upd 13
  - Remediation:
       Update WinCC to V7.3 Upd 13
  - Download:
       https://support.industry.siemens.com/cs/ww/en/view/109746452

* SIMATIC PCS 7 V8.2 
  - Affected versions:
       All versions < V8.2 SP1
  - Remediation:
       Update to V8.2 SP1
  - Download:
       To obtain SIMATIC PCS 7 V8.2 SP1 contact your local support.


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

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

* Apply cell protection concept
  
* Use VPN for protecting network communication between cells
  
* Apply Defense-in-Depth
  


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 3.0 (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-2017-6867

  An authenticated, remote attacker who is member of the "administrators"
  group couldcrash services by sending specially crafted messages to the
  DCOM interface.

  CVSS v3.0 Base Score: 4.9
  CVSS v3.0 Vector:     CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C


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

Siemens thanks the following parties for their efforts:

   * Sergey Temnikov and Vladimir Dashchenko from Critical Infrastructure Defense Team, Kasperky Lab for coordinated disclosure of 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 (2017-10-18): Publication Date
V1.1 (2018-06-12): Update of PCS 7 V8.2

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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