Microsoft’s scramble to address the fallout from the zero-day attacks against on-prem Exchange Server installations continued this week with the release of a one-click mitigation tool help businesses contain the damage.
The new Exchange On-premises Mitigation Tool (EOMT) is aimed at companies without dedicated security or IT teams to manage patching and post-incident forensics.
Microsoft said the tool has been tested across Exchange Server 2013, 2016, and 2019 deployments and is meant to be “an interim mitigation for customers who are unfamiliar with the patch/update process or who have not yet applied the on-premises Exchange security update.”
The EOMT has been combined with the Microsoft Safety Scanner to automatically mitigate the dangerous CVE-2021-26855 vulnerability on any Exchange server on which it is deployed.
“This tool is not a replacement for the Exchange security update but is the fastest and easiest way to mitigate the highest risks to internet-connected, on-premises Exchange Servers prior to patching,” Microsoft warned.
Here’s the latest list of Redmond’s recommendations:
• Download the EOMT tool.
• Run it on Exchange servers immediately.
• Follow the more detailed guidance here to ensure that your on-premises Exchange is protected.
• If you are already using Microsoft Safety Scanner, it is still live and Microsoft recommends keeping this running as it can be used to help with additional mitigations.
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