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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.3097
       Advisory (icsa-21-257-05) Siemens Simcenter STAR-CCM+ Viewer
                             15 September 2021

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Siemens Simcenter STAR-CCM+ Viewer
Publisher:         ICS-CERT
Operating System:  Windows
                   Linux variants
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account
                   Denial of Service               -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-25665  

Original Bulletin: 
   https://us-cert.cisa.gov/ics/advisories/icsa-21-257-05

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ICS Advisory (ICSA-21-257-05)

Siemens Simcenter STAR-CCM+ Viewer

Original release date: September 14, 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 7.8
  o ATTENTION: Low attack complexity
  o Vendor: Siemens
  o Equipment: Simcenter STAR-CCM+ Viewer
  o Vulnerability: Out-of-bounds Write

2. RISK EVALUATION

Successful exploitation of this vulnerability could lead to a crash and allow
an attacker to execute code in the context of the current process.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following versions of Simcenter STAR-CCM+ Viewer, a simulation application,
are affected:

  o Simcenter STAR-CCM+ Viewer: All versions prior to 2021.2.1

3.2 VULNERABILITY OVERVIEW

3.2.1 OUT-OF-BOUNDS WRITE CWE-787

The affected application lacks proper validation of user-supplied data when
parsing scene files. This could result in an out-of-bounds write past the end
of an allocated structure.

CVE-2021-25665 has been assigned to this vulnerability. A CVSS v3 base score of
7.8 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:R/S:U/
C:H/I:H/A:H ).

3.3 BACKGROUND

  o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
  o COUNTRIES/AREAS DEPLOYED: Worldwide
  o COMPANY HEADQUARTERS LOCATION: Germany

3.4 RESEARCHER

Francis Provencher {PRL}, working with Trend Micro's Zero Day Initiative,
reported this vulnerability to CISA.

4. MITIGATIONS

Siemens has recommended the following:

  o Update to v2021.2.1 or later versions .
  o Do not open untrusted scene files from unknown sources.

As a general security measure, Siemens strongly recommends users protect
network access to devices with appropriate mechanisms. In order to operate the
devices in a protected IT environment, Siemens recommends users configure the
environment according to Siemens operational guidelines for industrial security
and follow the recommendations in the product manual.

Additional information on Industrial Security by Siemens can be found at:
https://www.siemens.com/industrialsecurity

For more information see Siemens Security Advisory SSA-109294
CISA recommends users take the following measures to protect themselves from
social engineering attacks:

  o Do not click web links or open unsolicited attachments in email messages.
  o Refer to Recognizing and Avoiding Email Scams for more information on
    avoiding email scams.
  o Refer to Avoiding Social Engineering and Phishing Attacks for more
    information on social engineering attacks.

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 is not exploitable remotely.

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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