SSA-788287: Disclosure of Private Data
Publication Date:
2021-04-13
Last Update:
2021-04-13
Current Version:
V1.0
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The certificate was revoked immediately.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
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
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