![]() Running Health Checker will remind you of the need to remove the workaround. EWS web application pool stops after the February 2023 Security Update is installed – if you have implemented the workaround in the KB article, you must remove the workaround once the March SU is installed (see the KB article for instructions).There are no known issues with this release.If something does not work properly after updates, see Repair failed installations of Exchange Cumulative and Security updates. If you encounter errors during or after installation of Exchange Server, run the SetupAssist script.Always re-run Health Checker after you install an SU to see if any further actions are needed.Running this will tell you if any of your Exchange Servers are behind on updates (CUs, SUs) and if manual actions are needed. Inventory your Exchange Servers to determine which updates are needed using the Exchange Server Health Checker.Use the Exchange Update Wizard to choose your current CU and your target CU to get directions. The following update paths are available: No admin action is necessary other than installing March 2023 (or later) SU.ĭefenders can also read Guidance for investigating attacks using CVE-2023-23397 from Microsoft Incident Response (IR) team. Please note that Exchange Server March 2023 SUs contain a "defense in depth" change that removes the value of the property that can be exploited on unpatched Outlook for Windows clients for messages that are newly delivered to user mailboxes. The script will take some time to run, so we recommend prioritizing user mailboxes that are of higher value to attackers (e.g., executives, senior leadership, admins, etc.). The script will tell you if any users have been targeted by potentially malicious messages and allow you to modify or delete those messages if any are found. Please see the MSRC blog post about this vulnerability for more details.īut if your mailboxes are in Exchange Online or on Exchange Server, after installing the Outlook update, you can use a script we created to see if any of your users have been targeted using the Outlook vulnerability. To address this CVE, you must install the Outlook security update, regardless of where your mail is hosted (e.g., Exchange Online, Exchange Server, some other platform). ![]() ![]() There is a critical security update for Microsoft Outlook for Windows that is required to address CVE-2023-23397. Awareness: Outlook client update for CVE-2023-23397 released More details about specific CVEs can be found in the Security Update Guide (filter on Exchange Server under Product Family). Exchange Online customers are already protected from the vulnerabilities addressed in these SUs and do not need to take any action other than updating Exchange servers in their environment, and if applicable, installing the security update for Outlook on Windows described below. These vulnerabilities affect Exchange Server. ![]() Although we are not aware of any active exploits in the wild, our recommendation is to install these updates immediately to protect your environment. The March 2023 SUs address vulnerabilities responsibly reported to Microsoft by security partners and found through Microsoft’s internal processes. Exchange Server 2013 CU23 (note that support and availability of SUs end on April 11, 2023).SUs are available for the following specific versions of Exchange Server: exe package, as well as the original update packages (.msp files), which can be downloaded from the Microsoft Update Catalog. SUs are available in a self-extracting auto-elevating. Microsoft has released Security Updates (SUs) for vulnerabilities found in:
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