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# SSA-878278: Denial-of-Service Vulnerability in SIMATIC WinAC RTX (F) 2010

Publication Date:        2019-10-08
Last Update:             2020-01-14
Current Version:         1.1
CVSS v3.1 Base Score:    7.5

SUMMARY
=======

A vulnerability in SIMATIC WinAC RTX (F) 2010 controller software could
allow an attacker to perform a denial-of-service attack if a large HTTP
request is sent to the network port of the host where WinAC RTX is
running.

Siemens has released SIMATIC WinAC RTX (F) 2010 incl. SP3 Update 1 that
fixes the vulnerability, and recommends that customers update to this
new version.


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


* SIMATIC WinAC RTX (F) 2010 
  - Affected versions:
       All versions < SP3 Update 1
  - Remediation:
       Update to SIMATIC WinAC RTX (F) 2010 SP3 Update 1
  - Download:
       https://support.industry.siemens.com/cs/ww/en/view/109772291


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

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

* Restrict network access to the host containing the affected service.
  
* If the service is not used as a server, configure Windows Firewall to
disable communications on the port of the vulnerable service.
  


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 WinAC RTX (F) 2010 is a SIMATIC software controller for PC-based
automation solutions.

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-2019-13921

  Affected versions of the software contain a vulnerability that could
  allow an unauthenticated attacker to trigger a denial-of-service
  condition. The vulnerability can be triggered if a large HTTP request is
  sent to the executing service.
  
  The security vulnerability could be exploited by an attacker with
  network access to the affected systems. Successful exploitation requires
  no system privileges and no user interaction. An attacker could use the
  vulnerability to compromise availability of the service provided by the
  software.

  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:W/RC:C
  CWE:                  CWE-410: Insufficient Resource Pool


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

Siemens thanks the following parties for their efforts:

   * Tal Keren from Claroty 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 (2019-10-08): Publication Date
V1.1 (2020-01-14): Added update for SIMATIC WinAC RTX (F) 2010

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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