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# SSA-109294: Scene File Parsing Vulnerability in Simcenter STAR-CCM+ Viewer

Publication Date:        2021-09-14
Last Update:             2021-09-14
Current Version:         1.0
CVSS v3.1 Base Score:    7.8

SUMMARY
=======

Siemens Simcenter STAR-CCM+ Viewer is affected by a vulnerability that
could be triggered when the application reads scene (.sce) files. If a
user is tricked to open a malicious file with the affected application,
this could lead to a crash, and potentially also to arbitrary code
execution or data extraction on the target host system.

Siemens has released an update for Simcenter STAR-CCM+ Viewer and
recommends to update to the latest version to fix the vulnerability.
Siemens recommends to avoid opening of untrusted files from unknown
sources.


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


* Simcenter STAR-CCM+ Viewer 
  - Affected versions:
       All versions < V2021.2.1
  - Remediation:
       Update to V2021.2.1 or later version
  - Download:
       https://community.sw.siemens.com/s/article/Simcenter-STAR-CCM-Viewer-Download


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

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

* Do not open untrusted scene files from unknown sources



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

Simcenter STAR-CCM+ is a multiphysics computational fluid dynamics (CFD)
software for the simulation of products operating under real-world
conditions.

Simcenter STAR-CCM+ Viewer is a light-weight, license-free standalone
scene and plot viewer for Simcenter STAR-CCM+.

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-2021-25665

  The starview+.exe 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.
  
  An attacker could leverage this vulnerability to execute code in the
  context of the current process. (ZDI-CAN-13700)

  CVSS v3.1 Base Score: 7.8
  CVSS Vector:          CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
  CWE:                  CWE-787: Out-of-bounds Write


ACKNOWLEDGMENTS
===============

Siemens thanks the following parties for their efforts:

   * Trend Micro Zero Day Initiative for coordinated disclosure



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 (2021-09-14): 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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