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# SSA-141614: Denial-of-Service in SIMOCODE pro V EIP

Publication Date:        2019-04-09
Last Update:             2020-02-10
Current Version:         1.1
CVSS v3.1 Base Score:    7.5

SUMMARY
=======

SIMOCODE pro V EIP is affected by a vulnerability that could allow
remote attackers to conduct a Denial-of-Service (DoS) attack by sending
specially crafted packets to port 161/udp (SNMP).

Siemens has released an update for SIMOCODE pro V EIP and recommends
that customers update to the new version.


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


* SIMOCODE pro V EIP (incl. SIPLUS variants) 
  - Affected versions:
       All versions < V1.0.2
  - Remediation:
       Update to V1.0.2
  - Download:
       https://support.industry.siemens.com/cs/ww/en/view/109756912


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

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

* Protect network access to port 161/udp of affected devices.
  
* Apply cell protection concept and implement Defense-in-Depth:
https://www.siemens.com/cert/operational-guidelines-industrial-security.
  
* Use VPN for protecting network communication between cells.
  


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

SIMOCODE is the flexible and modular motor management system for
low-voltage motors.

SIPLUS extreme products are designed for reliable operation under
extreme conditions and are based on SIMATIC, LOGO!, SITOP, SINAMICS,
SIMOTION, SCALANCE or other devices. SIPLUS devices use the same
firmware as the product they are based on.

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-2017-12741

  Specially crafted packets sent to port 161/udp could cause a
  Denial-of-Service condition. The affected devices must be restarted
  manually.

  CVSS v3.1 Base Score: 7.5
  CVSS Vector:          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C
  CWE:                  CWE-400: Uncontrolled Resource Consumption ('Resource Exhaustion')


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

Siemens thanks the following parties for their efforts:

   * Artem Zinenko from Kaspersky for pointing out that SIPLUS should also be mentioned



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 (2019-04-09): Publication Date
V1.1 (2020-02-10): SIPLUS devices now explicitly mentioned in the list of affected products

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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