Office 365 implement Safe Links Policy (Manual)

Safe links is part of Defender for Office 365 that scans and rewrites URL’s in inbound email messages, Teams and other locations. Safe Links is an additional security layer on top of anti-spam and anti-malware protection. Safe Links scanning can help protect your organization from malicious links that are used in phishing and other attacks.

To be able to use the Safe Links (and other features) of Microsoft Defender you will need to have the Microsoft Defender license Plan 1 or 2. This license is also included in the following subscriptions:

  • Office 365 E5
  • Office 365 A5
  • Microsoft 365 E5 Security
  • Microsoft 365 E5
  • Microsoft 365 Business Premium (Plan 1 only)

With the following steps you should be able to setup up Safe Links in no time.

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Azure OMI Vulnerability

Microsoft has released multiple security updates in last Patch Tuesday. One off them fixes a high risk vulnerability (CVE-2021-38647) Also know as OMIGOD. This vulnerability can be used remotely, so exploitation is expected soon.

This flaw doesn’t directly affect Windows at all, because it’s a bug in Microsoft’s open source Open Management Infrastruture (OMI) tool that is designed for Linux in general, and for Azure-hosted Linux servers in particular. However, a lot of resources in Azure do use it

A brief overview

Simplified, OMI is Microsoft’s Linux based answer to WMI, that sysadmins use to keep managing their Windows Networks.

Like WMI, the OMI code runs as a priviliged process on your servers so that sysadmins, and system administration software, can query and control what’s going on, such as enumerating processes, kicking off utility programs, and checking up on system configuration settings.

Unfortunately, cyber criminals love WMI/OMI like we sysadmins do.

Sadly, OMIGOD is an OMI bug that, in theory, offers criminals the same sort of distributed power over your Linux servers…

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