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# SSA-310688: Denial-of-Service Vulnerability in SIMATIC S7-1500 CPU

Publication Date:        2014-08-14
Last Update:             2020-02-10
Current Version:         1.1
CVSS v3.1 Base Score:    7.5

SUMMARY
=======

The latest firmware update for the SIMATIC S7-1500 CPU family fixes a
vulnerability which could allow an attacker to perform a
Denial-of-Service attack under certain conditions. The attacker must
have network access to the device to exploit this vulnerability.


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


* SIMATIC S7-1500 CPU family (incl. related ET200 CPUs and SIPLUS
variants) 
  - Affected versions:
       All versions < V1.6
  - Remediation:
       Update to V1.6
  - Download:
       http://support.automation.siemens.com/WW/view/en/98164677


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


Siemens has not identified any specific mitigations or workarounds.


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

Products of the SIMATIC S7-1500 CPU family have been designed for
discrete and continuous control in industrial environments such as
manufacturing, food and beverages, and chemical industries worldwide.

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-2014-5074

  Specially crafted TCP packets could cause a Denial-of-Service of the
  device if sent in a specific order. The CPU will automatically restart
  and remain in STOP mode. The CPU needs to be manually put into RUN mode
  again.

  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-730: OWASP Top Ten 2004 Category A9 - Denial of Service


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

Siemens thanks the following parties for their efforts:

   * Arnaud Ebalard from Agence Nationale de la Sécurité des Systèmes
d’Information (ANSSI) for coordination 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 (2014-08-14): 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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