Mitigate against current known attacks using CVE-2021-26855 using a URL Rewrite configuration.The ‘EOMT.ps1’ script can be downloaded from Microsoft’s GitHub repository, and when executed, will automatically perform the following tasks: 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 before patching. This new tool designed as interim mitigation for customers who are unfamiliar with the patch/update process or who have not yet applied the on-premises Exchange security update.īy downloading and running this tool, which includes the latest Microsoft Safety Scanner, customers will automatically mitigate CVE-2021-26855 on any Exchange server on which it is deployed. These vulnerabilities are collectively known as ProxyLogon and are being used by threat actors to drop web shells, cryptominers, and more recently, the DearCry ransomware on exploited servers. Microsoft disclosed that four zero-day vulnerabilities were being actively used in attacks against Microsoft Exchange. The one-click Exchange On-premises Mitigation Tool (EOMT) tool, allow small business owners to easily mitigate the recently disclosed ProxyLogon vulnerabilities. We have tested this tool across Exchange Server 2013, 2016, and 2019 deployments.”, reads the post published by Microsoft. “Microsoft has released a new, one-click mitigation tool, Microsoft Exchange On-Premises Mitigation Tool to help customers who do not have dedicated security or IT teams to apply these security updates.
Microsoft has released a new, one-click mitigation tool, Microsoft Exchange On-Premises Mitigation Tool to allow customers to immediately address the vulnerabilities exploited in the recent attacks.
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