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# SSA-574442: Multiple PAR and DFT File Parsing Vulnerabilities in Solid Edge

Publication Date:        2021-04-13
Last Update:             2021-06-08
Current Version:         1.1
CVSS v3.1 Base Score:    7.8

SUMMARY
=======

Siemens has released a new version for Solid Edge to fix multiple
vulnerabilities that could be triggered when the application reads files
in different file formats (PAR, DFT extensions). 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
==============================


* Solid Edge SE2020 
  - Affected versions:
       All versions < SE2020MP13
  - Remediation:
       Update to SE2020MP13 or later version
  - Download:
       https://support.sw.siemens.com/ (login required)

* Solid Edge SE2020 
  - Affected versions:
       All versions < SE2020MP14
  - Affected by vulnerabilities:
    - CVE-2020-26997
    - CVE-2021-25678
    - CVE-2021-27382
  - Remediation:
       Update to SE2020MP14 or later version
  - Download:
       https://support.sw.siemens.com/ (login required)

* Solid Edge SE2021 
  - Affected versions:
       All Versions < SE2021MP4
  - Remediation:
       Update to SE2021MP4 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 Solid Edge



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

Solid Edge is a portfolio of software tools that addresses various
product development processes : 3D design, simulation, manufacturing and
design management.

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-2020-28385

  Affected applications lack proper validation of user-supplied data when
  parsing DFT 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-12049)

  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-2020-26997

  Affected applications lack proper validation of user-supplied data when
  parsing PAR files. This could lead to pointer dereferences of a value
  obtained from untrusted source. An attacker could leverage this
  vulnerability to execute code in the context of the current process.
  (ZDI-CAN-11919)

  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-822: Untrusted Pointer Dereference

* Vulnerability CVE-2021-25678

  Affected applications lack proper validation of user-supplied data when
  parsing 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-12529)

  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-2021-27380

  Affected applications lack proper validation of user-supplied data when
  parsing 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-12532)

  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-2021-27382

  Affected applications lack proper validation of user-supplied data when
  parsing of PAR files. This could result in a stack based buffer
  overflow. An attacker could leverage this vulnerability to execute code
  in the context of the current process. (ZDI-CAN-13040)

  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


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 more details regarding the vulnerabilities CVE-2020-28385 and
CVE-2021-27380 for fix SE2020MP13 refer to: - SSA-715184

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
V1.1 (2021-06-08): Updated remediation for CVE-2020-26997, CVE-2021-25678 and
CVE-2021-27382

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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