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# SSA-622830: Multiple File Parsing Vulnerabilities in JT2Go and Teamcenter
Visualization before V13.1.0

Publication Date:        2021-01-12
Last Update:             2021-05-17
Current Version:         1.2
CVSS v3.1 Base Score:    7.8

SUMMARY
=======

Siemens has released version V13.1.0 for JT2Go and Teamcenter
Visualization to fix multiple vulnerabilities that could be triggered
when the products read files in different file formats (JT, XML, CG4,
CGM, PDF, RGB, SGI, TGA, PAR, PCX). If a user is tricked to opening of a
malicious file with the affected products, this could lead to
application crash, or potentially arbitrary code execution or data
extraction on the target host system.

Siemens recommends to update to the latest versions and to limit opening
of untrusted files from unknown sources in the affected products. Please
refer to SSA-663999 [0] and SSA-695540 [1] for further information
regarding later version updates.

Note: Previous versions of this advisory also contained the
vulnerabilities CVE-2020-26989, CVE-2020-26990, and CVE-2020-28383 (now
addressed in [0]) and CVE-2020-26991 (now addressed in [1]).

[0] https://cert-portal.siemens.com/productcert/pdf/ssa-663999.pdf

[1] https://cert-portal.siemens.com/productcert/pdf/ssa-695540.pdf


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


* JT2Go 
  - Affected versions:
       All versions < V13.1.0
  - Remediation:
       Update to V13.1.0 or later version
  - Download:
       https://www.plm.automation.siemens.com/global/en/products/plm-components/jt2go.html

* Teamcenter Visualization 
  - Affected versions:
       All versions < V13.1.0
  - Remediation:
       Update to V13.1.0 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:

* Avoid to open untrusted files from unknown sources in JT2Go and
Teamcenter Visualization



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

JT2Go is a 3D JT viewing tool to allow users to view JT, PDF, Solid
Edge, PLM XML with available JT, VFZ, CGM, and TIF data.

Teamcenter Visualization software enables enterprises to enhance their
product lifecycle management (PLM) environment with a comprehensive
family of visualization solutions. The software enables enterprise users
to access documents, 2D drawings and 3D models in a single environment.

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-2020-26980

  Affected applications lack proper validation of user-supplied data when
  parsing JT files. A crafted JT file could trigger a type confusion
  condition. An attacker could leverage this vulnerability to execute code
  in the context of the current process. (ZDI-CAN-11881)

  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-843: Access of Resource Using Incompatible Type ('Type Confusion')

* Vulnerability CVE-2020-26981

  When opening a specially crafted xml file, the application could
  disclose arbitrary files to remote attackers. This is because of the
  passing of specially crafted content to the underlying XML parser
  without taking proper restrictions such as prohibiting an external dtd.
  (ZDI-CAN-11890)

  CVSS v3.1 Base Score: 5.6
  CVSS Vector:          CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:L/E:P/RL:O/RC:C
  CWE:                  CWE-611: Improper Restriction of XML External Entity Reference

* Vulnerability CVE-2020-26982

  Affected applications lack proper validation of user-supplied data when
  parsing CG4 and CGM 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-11898)

  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

* Vulnerability CVE-2020-26983

  Affected applications lack proper validation of user-supplied data when
  parsing PDF 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-11900)

  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

* Vulnerability CVE-2020-26984

  Affected applications lack proper validation of user-supplied data when
  parsing of JT 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-11972)

  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

* Vulnerability CVE-2020-26985

  Affected applications lack proper validation of user-supplied data when
  parsing of RGB and SGI files. This could result in a heap-based buffer
  overflow. An attacker could leverage this vulnerability to execute code
  in the context of the current process. (ZDI-CAN-11986, ZDI-CAN-11994)

  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-122: Heap-based Buffer Overflow

* Vulnerability CVE-2020-26986

  Affected applications lack proper validation of user-supplied data when
  parsing of JT files. This could lead to a heap-based buffer overflow. An
  attacker could leverage this vulnerability to execute code in the
  context of the current process. (ZDI-CAN-12014)

  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-122: Heap-based Buffer Overflow

* Vulnerability CVE-2020-26987

  Affected applications lack proper validation of user-supplied data when
  parsing of TGA files. This could lead to a heap-based buffer overflow.
  An attacker could leverage this vulnerability to execute code in the
  context of the current process. (ZDI-CAN-12016, ZDI-CAN-12017)

  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-122: Heap-based Buffer Overflow

* Vulnerability CVE-2020-26988

  Affected applications lack proper validation of user-supplied data when
  parsing of PAR 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-11891)

  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

* Vulnerability CVE-2020-26992

  Affected applications lack proper validation of user-supplied data when
  parsing CGM files. This could lead to a stack based buffer overflow
  while trying to copy to a buffer during font string handling. An
  attacker could leverage this vulnerability to execute code in the
  context of the current process.

  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-121: Stack-based Buffer Overflow

* Vulnerability CVE-2020-26993

  Affected applications lack proper validation of user-supplied data when
  parsing CGM files. This could lead to a stack based buffer overflow
  while trying to copy to a buffer in the font index handling function. An
  attacker could leverage this vulnerability to execute code in the
  context of the current process.

  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-121: Stack-based Buffer Overflow

* Vulnerability CVE-2020-26994

  Affected applications lack proper validation of user-supplied data when
  parsing of PCX files. This could result in a heap-based buffer overflow.
  An attacker could leverage this vulnerability to execute code in the
  context of the current process.

  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-122: Heap-based Buffer Overflow

* Vulnerability CVE-2020-26995

  Affected applications lack proper validation of user-supplied data when
  parsing of SGI and RGB 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-11992)

  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

* Vulnerability CVE-2020-26996

  Affected applications lack proper validation of user-supplied data when
  parsing of CG4 files. This could result in a memory access past the end
  of an allocated buffer. An attacker could leverage this vulnerability to
  execute code in the context of the current process. (ZDI-CAN-12027)

  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-125: Out-of-bounds Read


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

Siemens thanks the following parties for their efforts:

   * Trend Micro Zero Day Initiative for coordinated disclosure of CVE-2020-26980 through CVE-2020-26991,
CVE-2020-26995, CVE-2020-26996 and CVE-2020-28383
   * Carsten Eiram from Risk Based Security for coordinated disclosure of CVE-2020-26992, CVE-2020-26993, CVE-2020-26980
and CVE-2020-26986
   * 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 (2021-01-12): Publication Date
V1.1 (2021-02-09): Included fix information for CVE-2020-26989, CVE-2020-26990 and
CVE-2020-26991, and reference to new advisory SSA-663999
V1.2 (2021-05-17): Moved vulnerabilities CVE-2020-26989, CVE-2020-26990, and CVE-2020-28383
to advisory SSA-663999; moved CVE-2020-26991 to SSA-695540

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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