Microsoft is pleased to announce the release of the recommended security configuration baseline settings for Microsoft 365 Apps for enterprise, version 2206. Please download the content from the Microsoft Security Compliance Toolkit, test the recommended configurations, and implement as appropriate.
This baseline builds on the previous Office baseline we released December 2021. The highlights of this baseline include:
The recommended settings in this security baseline correspond with the administrative templates version 5287, released on 2/9/2022.
Deployment options for the baseline
IT Admins can apply baseline settings in different ways. Depending on the method(s) chosen different registry keys will be written and they will be observed in order of precedence: Office cloud policies will override ADMX/Group Policies which will override end user settings in the Trust Center.
GPOs included in the baseline
Most organizations can implement the baseline’s recommended settings without any problems. However, there are a few settings that will cause operational issues for some organizations. We've broken out related groups of such settings into their own GPOs to make it easier for organizations to add or remove these restrictions as a set. The local-policy script (Baseline-LocalInstall.ps1) offers command-line options to control whether these GPOs are installed.
"MSFT Microsoft 365 Apps v2206" GPO set includes “Computer” and “User” GPOs that represent the “core” settings that should be trouble free, and each of these potentially challenging GPOs:
Removed the recommendation for Junk E-mail protection policy
This policy controls the deprecated feature of SmartScreen for Exchange that's been replaced by Exchange Online Protection (EOP) as of 2016, learn more in this blog article. Previously, we recommended setting the policy to HIGH, however, this can conflict with EOP and cause false negatives and other junk email filtering issues. The SmartScreen for Exchange service is no longer supported and we are removing this recommendation from the security baselines.
New Office default: VBA macros blocked in files from the Internet
VBA macros are a common way for malicious actors to gain access to deploy malware and ransomware, for years we've recommended enabling this policy as part of the security baselines, and we're now enabling this behavior by default for everyone. If you've already set this policy in your organization, this default change will not affect you as policy will take precedence over this default. If however, you have not configured "Block macros in files obtained from the internet" for Office apps (Access, Excel, PowerPoint, Visio, Word) this change will impact you. Learn more in the blog article in Tech Community, and the Admin article listing all release timeframes and options for administration.
Mismatched recommendations corrected
The Office team upgraded the tooling that creates the Office resources and documentation for the Compliance Toolkit. These improvements found some mismatches between the "MSFT Microsoft 365 Apps v2112 - User" GPO and the spreadsheet documentation, we have corrected these:
Known Issue: The Solver add-in that ships with Excel may not work properly with a certain security policy enabled... When the recommended security baselines policy "Prevent Excel from running XLM macros" is enabled, the Solver and Analysis ToolPak add-ins will not function properly. Functionality may be missing, and results may not be computed, even if the user is informed of a successful computation. A fix is in progress and workarounds, current status, and availability are included in the article.
When can I expect the next release of Microsoft 365 Apps for enterprise Security Baseline?
In the future, we'll plan to release new security baselines every 6 months, usually in June and December.
If you have questions or issues, please let us know via the Security Baseline Community or this post.
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