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# SSA-163226: CELL File Parsing Vulnerability in Tecnomatix RobotExpert

Publication Date:        2021-04-13
Last Update:             2021-04-13
Current Version:         1.0
CVSS v3.1 Base Score:    7.8

SUMMARY
=======

Siemens Tecnomatix RobotExpert version V16.1 fixes a vulnerability that
could be triggered when the application reads CELL 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 recommends to update to the latest version and to avoid opening
of untrusted files from unknown sources.


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


* Tecnomatix RobotExpert 
  - Affected versions:
       All versions < V16.1
  - Remediation:
       Update to V16.1 or later version
  - Download:
       https://support.sw.siemens.com/ (login required)


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

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

* Do not open untrusted CELL 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
===================

RobotExpert is an easy-to-deploy, robot simulation and offline
programming software that enables you to perform complete 3D modeling,
visualization and simulation of your automation systems including
robots, tooling and peripheral equipment.

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-2021-25670

  Affected applications lack proper validation of user-supplied data when
  parsing CELL 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-12608)

  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
   * Cybersecurity and Infrastructure Security Agency (CISA) for coordination efforts



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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