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# SSA-434535: Memory Protection Bypass Vulnerability in SINAMICS PERFECT HARMONY GH180
Drives

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

SUMMARY
=======

Several models of SINAMICS PERFECT HARMONY GH180 Drives are affected by
a memory protection bypass vulnerability in the integrated S7-1500 or
S7-1200 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 provides new drives with the fix included and recommends
specific countermeasures for older drives. The list of affected drive
models can be found in the section "Additional Information".


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


* SINAMICS PERFECT HARMONY GH180 Drives 
  - Affected versions:
       Drives manufactured before 2021-08-13
  - Remediation:
       Drives manufactured on 2021-08-13 or later are not affected, as they
       contain a corrected version of the S7-1500 or S7-1200 CPU.
       For drives manufactured before 2021-08-13, see the recommendations from
       section Workarounds and Mitigations.


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

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

* Avoid compromise of the individually configured access protection
password to the S7-1500 or S7-1200 CPU

* Ensure that the drive internal network is not externally connected
(which is the default configuration in all drives as described in the
operational manual)



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

The SINAMICS PERFECT HARMONY GH180 medium voltage drive family is used
to control a wide variety of medium voltage converters or inverters in
different applications.

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
======================
The following models of SINAMICS PERFECT HARMONY GH180 Drives are
affected by CVE-2020-15782:

- -   6SR5 with options A84, A85, E06, W41 with X30 air to air hex
- -   6SR4 with option W41 with X30 air to air hex

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 affected SINAMICS PERFECT HARMONY GH180 Drives

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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