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# SSA-788287: Disclosure of Private Data

Publication Date:        2021-04-13
Last Update:             2021-04-13
Current Version:         1.0
CVSS v3.1 Base Score:    10.0

SUMMARY
=======

Due to SmartClient Installation technology (ClickOnce) a
customer/integrator needs to create a customer specific Smartclient
installer. The mentioned products delivered a trusted but yet expired
codesigning certificate.

An attacker could have exploited the vulnerability by spoofing the
code-signing certificate and signing a malicious executable resulting in
having a trusted digital signature from a trusted provider.

The certificate was revoked immediately.


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


* Opcenter Quality 
  - Affected versions:
       All versions < V12.2
  - Remediation:
        See recommendations from section Workarounds and Mitigations

* QMS Automotive 
  - Affected versions:
       All versions < V12.30
  - Remediation:
        See 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:

* Explicitly distrust the certificate with the fingerprint
FA:53:A4:74:FC:1E:16:6F:E6:6A:D2:5A:C1:E6:
8B:B1:91:CB:38:E9:85:7E:07:79:C1:A5:C3:59:1A:5A:04:96

* The certificate expired on 7th March 2021 and was not renewed.

* Make sure to use correct Certificate validation (CRL / OSCP) when
validating certificates.



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

Opcenter Quality (formerly known as "CAQ=QSYS") is a quality management
system (QMS) that enables organizations to safeguard compliance,
optimize quality, reduce defect and rework costs and achieve operational
excellence by increasing process stability. The integrated process
capabilities (control charts, statistics, quality gates) can detect
production errors to avoid further processing and shipment of
nonconforming material.

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-2021-27389

  A private sign key is shipped with the product without adequate
  protection.

  CVSS v3.1 Base Score: 10.0
  CVSS Vector:          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:P/RL:U/RC:C
  CWE:                  CWE-321: Use of Hard-coded Cryptographic Key




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 (2021-04-13): Publication Date

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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