-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

# SSA-434536: Memory Protection Bypass Vulnerability in SINUMERIK ONE and SINUMERIK MC

Publication Date:        2021-07-13
Last Update:             2021-09-14
Current Version:         1.1
CVSS v3.1 Base Score:    8.1

SUMMARY
=======

SINUMERIK ONE and SINUMERIK MC products are affected by a memory
protection bypass vulnerability in the integrated S7-1500 CPU that could
allow an attacker to write arbitrary data and code to protected memory
areas or read sensitive data to launch further attacks on the CPU.

Siemens has released updates for the affected products and recommends
that customers update to the new version.


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


* SINUMERIK MC 
  - Affected versions:
       All versions < V6.15
  - Remediation:
       Update to V6.15 or later version
  - Download:
       SINUMERIK software can be obtained from your local Siemens account
       manager.

* SINUMERIK ONE 
  - Affected versions:
       All versions < V6.15
  - Remediation:
       Update to V6.15 or later version
  - Download:
       SINUMERIK software can be obtained from your local Siemens account
       manager.


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

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

* Limit access to port 102/tcp to trusted users and systems only



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

SINUMERIK MC is a CNC system for customized machine solutions.

SINUMERIK ONE is a digital-native CNC system.

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-2020-15782

  Affected devices are vulnerable to a memory protection bypass through a
  specific operation.
  
  A remote unauthenticated attacker with network access to port 102/tcp
  could potentially write arbitrary data and code to protected memory
  areas or read sensitive data to launch further attacks.

  CVSS v3.1 Base Score: 8.1
  CVSS Vector:          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
  CWE:                  CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer




ADDITIONAL INFORMATION
======================
For more information regarding CVE-2020-15782 refer to the Siemens
Security Advisory SSA-434534
(https://cert-portal.siemens.com/productcert/pdf/ssa-434534.pdf)

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 (2021-07-13): Publication Date
V1.1 (2021-09-14): Added solution for SINUMERIK MC and SINUMERIK ONE

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.
-----BEGIN PGP SIGNATURE-----
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=ivj4
-----END PGP SIGNATURE-----