12/30/2023 0 Comments Msert hafnium![]() 10 minutes – Putting the Exchange Server into DAG Maintenance Mode.That resulted in finding an exploit and removing it (kicking them out of my house):Ĭlicking the link (under Malware) brought me to: Exploit:ASP/CVE-2021-27065.B!dha threat description – Microsoft Security IntelligenceĪfter this action was taken, I took the server out of Maintenance Mode. Every time you plan to run the MSERT download a new copy so that you have the most up-to-date information. Make sure you are in Maintenance Mode when running this! The scanner uses 100% of CPU. Then, I followed the instructions on Microsoft Exchange Server Vulnerabilities Mitigations – updated Ma– Microsoft Security Response Center by downloading MSERT and running a FULL SCAN on the Exchange Server that showed the suspicious activity. (Click the output above to see it enlarged.) “Kicking them out of my house” log files in the Test-ProxyLogonLogs subdirectory of the directory that you ran the script in: microsoft/CSS-Exchange () and found suspicious activity.I ran the Test-ProxyLogon.ps1 CSS-Exchange/Security at main You can confirm that your server is patched by running the HealthChecker.ps1 script inside an elevated Exchange Management Shell window. (You might be prompted by the installer to restart.) March 2021 Exchange Server Security Updates for older Cumulative Updates of Exchange Server My Actions “Locking my doors”ġ – Putting the Exchange Server into DAG Maintenance ModeĢ – Installing the most recent Cumulative Update (run as Administrator)ģ – Temporarily disable file-level antivirus softwareĤ – Installing the Security Patch by opening up a Run as Administrator CMD and running the file via elevated command prompt – VERY IMPORTANT TO RUN IT THIS WAY)ĥ – After the installation is finished, re-enable the antivirus software, and then restart the computer. ![]() Exchange Team Blog – Released: March 2021 Exchange Server Security Updates
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