Microsoft releases OOB security updates for Microsoft Office

Microsoft has released an out-of-band security update that fixes remote code execution vulnerabilities in an Autodesk FBX library integrated into Microsoft Office and Paint 3D applications.

Last month, Autodesk issued security updates for their Autodesk FBX Software Development Kit that resolves remote code execution and denial of service vulnerabilities caused by specially crafted FBX files.

An FBX file is an Autodesk file format that is used to store 3D models, assets, shapes, and animations.

To exploit these vulnerabilities, an attacker would create a malicious FBX file that would exploit “buffer overflow, type confusion, use-after-free, integer overflow, NULL pointer dereference, and heap overflow vulnerabilities” to perform a DoS attack or remotely execute code.

Microsoft Office uses the Autodesk FBX library

As the Microsoft Office 2016, Microsoft 2019, Office 365, and Paint 3D applications utilize the Autodesk FBX library, Microsoft has released today new security updates that resolve these remote code execution and DoS vulnerabilities in their products.

In an advisory titled “ADV200004 | Availability of updates for Microsoft software utilizing the Autodesk FBX library”, Microsoft explains that opening malicious FBX files in Office applications could lead to remote code execution.

Microsoft is announcing the release of updates to address multiple vulnerabilities found in the Autodesk FBX library which is integrated into certain Microsoft applications. Details about the vulnerabilities can be found here – https://www.autodesk.com/trust/security-advisories/adsk-sa-2020-0002

Remote code execution vulnerabilities exist in Microsoft products that utilize the FBX library when processing specially crafted 3D content. An attacker who successfully exploited these vulnerabilities could gain the same user rights as the local user. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.

To exploit the vulnerabilities, an attacker must send a specially crafted file containing 3D content to a user and convince them to open it.

The security updates address these vulnerabilities by correcting the way 3D content is handled by Microsoft software.

How to install the Microsoft Office security updates

To install these security updates now, Office users can open an Office application, click on the File menu option, and then select Account.

When the account page opens, on the right, you will see a section titled “Office Updates” with a button labeled ‘Update Options’. Click on this button and select Update Now.

Office Updates section
Office Updates section

Microsoft Office will now check for and install any available updates.

Downloading Office updates
Downloading Office updates

Once the updates are downloaded and installed, Microsoft Office will need to restart your Office applications. Be sure to save any open documents before doing so.

Kent

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