AUTODESK TRUST CENTER

Security advisory

Advisories are used to communicate information related to vulnerabilities identified with Autodesk products and services. This includes any fixes or workarounds that are applicable to the affected product.

Vulnerabilities in the Autodesk® AutoCAD® family of products

Autodesk ID: ADSK-SA-2021-0004
Product, Service, Component: Autodesk® AutoCAD®, Advance Steel and Civil 3D
Impact: Out-of-bound Read, Out-of-bound Write, Write-what-where Condition
Severity: High
Original Publish: 17/06/2021
Last Revised: 27/08/2021

Severity

CVSS 3.0 Score

Impact

Low

0.1 - 3.9

A vulnerability where scope and impact of exploitation is restricted and the ability to exploit is extremely difficult.

Medium

4.0 - 6.9

A vulnerability where exploitation is mitigated by factors such as difficulty to exploit, default configuration or ease of identification.

High

7.0 - 8.9

A vulnerability, which if exploited, would directly impact the confidentiality, integrity or availability of user’s data or processing resources.

Critical

9.0 - 10

A vulnerability, which if exploited, would allow remote execution of malicious code without user action.

Summary

Applications and Services that utilize Autodesk AutoCAD products are affected by Out-of-bound Read, Out-of-bound Write, and Memory Corruption vulnerabilities. Exploitation of these vulnerabilities could lead to arbitrary code execution.

Description

The details of the vulnerabilities are as follows:

  1. CVE-2021-27040 - A maliciously crafted DWG file can be forced to read beyond allocated boundaries when parsing the DWG file. This vulnerability can be exploited to execute arbitrary code.
  2. CVE-2021-27041 - A maliciously crafted DWG file can be used to write beyond the allocated buffer while parsing DWG files. This vulnerability can be exploited to execute arbitrary code.
  3. CVE-2021-27042 - A maliciously crafted DWG file can be used to write beyond the allocated buffer while parsing DWG files. The vulnerability exists because the application fails to handle a crafted DWG file, which causes an unhandled exception. An attacker can leverage this vulnerability to execute arbitrary code.
  4. CVE-2021-27043 - An Arbitrary Address Write issue in the Autodesk DWG application can allow a malicious user to leverage the application to write in unexpected paths. In order to exploit this the attacker would need the victim to enable full page heap in the application.

Affected Products

Item

Impacted Versions

Mitigated Versions**

Update Source

Autodesk® Advance Steel

2022, 2021, 2020, 2019

2022.0.1, 2021.1.1, 2020.1.4, 2019.1.3

Autodesk Desktop App,
or Accounts Portal

AutoCAD®

2022, 2021, 2020, 2019

2022.0.1, 2021.1.1, 2020.1.4, 2019.1.3

Autodesk Desktop App,
or Accounts Portal

AutoCAD® Architecture

2022, 2021, 2020, 2019

2022.0.1, 2021.1.1, 2020.1.4, 2019.1.3

Autodesk Desktop App,
or Accounts Portal

AutoCAD® Electrical

2022, 2021, 2020, 2019

2022.0.1, 2021.1.1, 2020.1.4, 2019.1.3

Autodesk Desktop App,
or Accounts Portal

AutoCAD® Map 3D

2022, 2021, 2020, 2019

2022.0.1, 2021.1.1, 2020.1.4, 2019.1.3

Autodesk Desktop App,
or Accounts Portal

AutoCAD® Mechanical

2022, 2021, 2020, 2019

2022.0.1, 2021.1.1, 2020.1.4, 2019.1.3

Autodesk Desktop App,
or Accounts Portal

AutoCAD® MEP

2022, 2021, 2020, 2019

2022.0.1, 2021.1.1, 2020.1.4, 2019.1.3

Autodesk Desktop App,
or Accounts Portal

AutoCAD® Plant 3D

2022, 2021, 2020, 2019

2022.0.1, 2021.1.1, 2020.1.4, 2019.1.3

Autodesk Desktop App,
or Accounts Portal

AutoCAD® LT

2022, 2021, 2020, 2019

2022.0.1, 2021.1.1, 2020.1.4, 2019.1.3

Autodesk Desktop App,
or Accounts Portal

Autodesk® Civil 3D

2022, 2021, 2020, 2019

2022.0.1, 2021.1.1, 2020.1.4, 2019.1.3

Autodesk Desktop App,
or Accounts Portal

AutoCAD® for Mac

2022, 2021, 2020, 2019

2022.1, 2021.1.2, 2020.2.1, 2019.2.1

Autodesk Desktop App,
or Accounts Portal

AutoCAD® LT for Mac

2022, 2021, 2020, 2019

2022.1, 2021.1.2, 2020.2.1, 2019.2.1

Autodesk Desktop App,
or Accounts Portal

*Note: Product list table contents subject to change.

**Note: AutoCAD and AutoCAD LT updates released subsequent to the versions listed in this table will automatically include all previously released security fixes.

Recommendations

Users of the 2019, 2020, 2021 and 2022 versions of Autodesk® Advance Steel, Autodesk® Civil 3D, AutoCAD®, AutoCAD® LT, and AutoCAD-based specialized toolsets listed in the table above should install the latest AutoCAD®, AutoCAD LT 2019-2022 Updates via the Autodesk Desktop App, or the Accounts Portal. Customers using previous versions that no longer qualify for full support should plan to upgrade to a supported version as soon as possible to avoid downtime and potential security vulnerabilities. Visit the Autodesk Knowledge Network for more information about previous version support.

Note: Users of the specialized toolsets need to install either the AutoCAD update(s) listed above or a more recent product version. These security fixes are not included in the updates specific to individual toolsets.

Acknowledgements

We would like to thank the following for reporting the relevant vulnerabilities and for working with Autodesk to help protect our customers:

  • Michael DePlante (@izobashi) of Trend Micro's Zero Day Initiative for reporting CVE-2021-27040 and CVE-2021-27041.
  • Yonghui Han of Fortinet's FortiGuard Labs for reporting CVE-2021-27040, CVE-2021-27042, and CVE-2021-27043.

Revision History

Revision

Date

Description

1.0

17/06/2021

Initial Release

1.1

27/07/2021

Update to Affected Products Table

1.2

27/08/2021

Update to Affected Products Table

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