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AUSCERT External Security Bulletin Redistribution
ESB-2021.2400
Advisory (icsa-21-194-04) Siemens SINUMERIK Integrate Operate Client
15 July 2021
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AusCERT Security Bulletin Summary
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Product: SINUMERIK Products
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Provide Misleading Information — Remote/Unauthenticated
Reduced Security — Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-31892
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-21-194-04
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ICS Advisory (ICSA-21-194-04)
Siemens SINUMERIK Integrate Operate Client
Original release date: July 13, 2021
Legal Notice
All information products included in https://us-cert.cisa.gov/ics are provided
“as is” for informational purposes only. The Department of Homeland Security
(DHS) does not provide any warranties of any kind regarding any information
contained within. DHS does not endorse any commercial product or service,
referenced in this product or otherwise. Further dissemination of this product
is governed by the Traffic Light Protocol (TLP) marking in the header. For more
information about TLP, see https://us-cert.cisa.gov/tlp/ .
1. EXECUTIVE SUMMARY
o CVSS v3 7.4
o ATTENTION : Exploitable remotely
o Vendor : Siemens
o Equipment : SINUMERIK Integrate Operate Client
o Vulnerability : Improper Certificate Validation
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow an attacker to spoof
any SSL server certificate and conduct man-in-the-middle attacks.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of SINUMERIK are affected:
o SINUMERIK Analyze MyCondition: All versions
o SINUMERIK Analyze MyPerformance: All versions
o SINUMERIK Analyze MyPerformance / OEE-Monitor: All versions
o SINUMERIK Analyze MyPerformance / OEE-Tuning: All versions
o SINUMERIK Integrate Client 02: All versions including v02.00.12 and up to
but not including v02.00.18
o SINUMERIK Integrate Client 03: All versions between v03.00.12 and up to but
not including v03.00.18
o SINUMERIK Integrate Client 04: Version v04.00.02 and all versions including
v04.00.15 up to but not including v04.00.18
o SINUMERIK Integrate for Production 4.1: All versions prior to v4.1 SP10 HF3
o SINUMERIK Integrate for Production 5.1: Version 5.1
o SINUMERIK Manage MyMachines: All versions
o SINUMERIK Manage MyMachines / Remote: All versions
o SINUMERIK Manage MyMachines / Spindel Monitor: All versions
o SINUMERIK Manage MyPrograms: All versions
o SINUMERIK Manage MyResources / Programs: All versions
o SINUMERIK Manage MyResources / Tools: All versions
o SINUMERIK Manage My Tools: All versions
o SINUMERIK Operate v4.8: All versions prior to v4.8 SP8
o SINUMERIK Operate v4.93: All versions prior to v4.93 HF7
o SINUMERIK Operate v4.94: All versions prior to v4.94 HF5
o SINUMERIK Optimize MyProgramming / NX-Cam Editor: All versions
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER CERTIFICATE VALIDATION CWE-295
Due to an error in a third-party dependency, the SSL flags used for setting up
a TLS connection to a server are overwritten with wrong settings. This results
in a missing validation of the server certificate and thus results in a
possible TLS MITM scenario.
CVE-2021-31892 has been assigned to this vulnerability. A CVSS v3 base score of
7.4 has been calculated; the CVSS vector string is ( AV:N/AC:H/PR:N/UI:N/S:U/
C:H/I:H/A:N ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS : Multiple
o COUNTRIES/AREAS DEPLOYED : Worldwide
o COMPANY HEADQUARTERS LOCATION : Germany
3.4 RESEARCHER
Siemens reported this vulnerability to CISA.
4. MITIGATIONS
Siemens has provided remediations for the following affected products. Contact
the Siemens representative for information on how to obtain the following
updates:
o SINUMERIK Analyze MyCondition: Update SINUMERIK Integrate Client
o SINUMERIK Analyze MyPerformance: Update SINUMERIK Integrate Client
o SINUMERIK Analyze MyPerformance / OEE-Monitor: Update SINUMERIK Integrate
Client
o SINUMERIK Analyze MyPerformance / OEE-Tuning: Update SINUMERIK Integrate
Client
o SINUMERIK Integrate Client 02: Update to v02.00.18
o SINUMERIK Integrate Client 03: Update to v03.00.18
o SINUMERIK Integrate Client 04: Update to v04.00.18
o SINUMERIK Integrate for Production 4.1: Update SINUMERIK Integrate Client
o SINUMERIK Integrate for Production 5.1: Update SINUMERIK Integrate Client
o SINUMERIK Manage MyMachines: Update SINUMERIK Integrate Client
o SINUMERIK Manage MyMachines / Remote: Update SINUMERIK Integrate Client
o SINUMERIK Manage MyMachines / Spindel Monitor: Update SINUMERIK Integrate
Client
o SINUMERIK Manage MyPrograms: Update SINUMERIK Integrate Client
o SINUMERIK Manage MyResources / Programs: Update SINUMERIK Integrate Client
o SINUMERIK Manage MyResources / Tools: Update SINUMERIK Integrate Client
o SINUMERIK Manage My Tools: Update SINUMERIK Integrate Client
o SINUMERIK Operate v4.8: Update SINUMERIK Operate to v4.8 SP8 or update
included SINUMERIK Integrate Client
o SINUMERIK Operate v4.93: Update SINUMERIK Operate to v4.93 HF7 or update
included SINUMERIK Integrate Client
o SINUMERIK Operate v4.94: Update SINUMERIK Operate to v4.94 HF5 or update
included SINUMERIK Integrate Client
o SINUMERIK Optimize MyProgramming / NX-Cam Editor: Update SINUMERIK
Integrate Client
As a general security measure, Siemens strongly recommends protecting network
access to devices with appropriate mechanisms. To operate the devices in a
protected IT environment, Siemens recommends configuring the environment
according to Siemens Operational Guidelines for 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
For more information about this vulnerability and the associated remediations,
please see Siemens Security Advisory SSA-729965 .
CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. Specifically, users should:
o Minimize network exposure for all control system devices and/or systems,
and ensure that they are not accessible from the Internet .
o Locate control system networks and remote devices behind firewalls, and
isolate them from the business network.
o When remote access is required, use secure methods, such as Virtual Private
Networks (VPNs), recognizing that VPNs may have vulnerabilities and should
be updated to the most current version available. Also recognize that VPN
is only as secure as the connected devices.
CISA reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices
on the ICS webpage on us-cert.cisa.gov . Several recommended practices are
available for reading and download, including Improving Industrial Control
Systems Cybersecurity with Defense-in-Depth Strategies .
Additional mitigation guidance and recommended practices are publicly available
on the ICS webpage on us-cert.cisa.gov in the Technical Information Paper,
ICS-TIP-12-146-01B–Targeted Cyber Intrusion Detection and Mitigation
Strategies .
Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to CISA for tracking
and correlation against other incidents.
No known public exploits specifically target this vulnerability. This
vulnerability has a high attack complexity.
For any questions related to this report, please contact the CISA at:
Email: CISAservicedesk@cisa.dhs.gov
Toll Free: 1-888-282-0870
CISA continuously strives to improve its products and services. You can help by
choosing one of the links below to provide feedback about this product.
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NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT’s members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation’s
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
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Contact information for the authors of the original document is included
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Previous advisories and external security bulletins can be retrieved from:
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Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
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