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Description of the security update for Office Online Server: January 14, 2020

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Summary

This security update resolves a spoofing vulnerability that exists if Office Online does not validate the origin in cross-origin communications correctly. To learn more about the vulnerability, see Microsoft Common Vulnerabilities and Exposures CVE-2020-0647.

Note To apply this security update, you must have the release version of Microsoft Office Online Server installed on the computer.
 

Known issues in this update

  • After you install this security update, Office Online Server logging will be set to Verbose by default. We recommend that you change this setting to Medium by running the following command:

    Set-OfficeWebAppsFarm -LogVerbosity “Medium”

    Note After you run the command, you have to restart the Office Online Service. To do this, run the following command:

    Restart-Service WACSM

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How to get and install the update

Method 1: Microsoft Update

This update is available from Microsoft Update. When you turn on automatic updating, this update will be downloaded and installed automatically. For more information about how to get security updates automatically, see Windows Update: FAQ.

Method 2: Microsoft Update Catalog

To get the standalone package for this update, go to the Microsoft Update Catalog website.

Method 3: Microsoft Download Center

You can get the standalone update package through the Microsoft Download Center. Follow the installation instructions on the download page to install the update.

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More information

Security update deployment information

For deployment information about this update, see security update deployment information: January 14, 2020.

Security update replacement information

This security update replaces previously released update 4484141.

File hash information

File name SHA1 hash SHA256 hash
wacserver2019-kb4484223-fullfile-x64-glb.exe 41E5386E563A93948B27AA798E33775863015DBF F5FFFDED2524DBCA43BC48C09429EC2A62E0126264358A556ABA314C0A4E2F5F


File information

Download the list of files that are included in security update 4484223.

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Information about protection and security

Protect yourself online: Windows Security support

Learn how we guard against cyber threats: Microsoft Security

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Keywords: kbBug, kbfix, kbsurveynew, kbExpertiseInter, KbSECBulletin, KbSECVulnerability, ATdownload, kbMustLoc, kbLangAll, kbSecurity, kbSecReview

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Article Info
Article ID : 4484223
Revision : 12
Created on : 5/1/2020
Published on : 5/4/2020
Exists online : False
Views : 313