All things Exchange
Today Exchange 2013 reaches the end of the road and it will transition out of extended support. Hopefully everyone has migrated to a newer version and/or Office 365. But experience tells me that will not be the case.
Hopefully no one will have Exchange 2013 published to the Internet either, but again experience says otherwise…
Please note that Microsoft will not provide technical support, time zon… Read the rest “End of Exchange 2013 Support”
A common issue when deploying Exchange Online Protection (EOP) and Microsoft Defender for Office 365 (MDO) with on-premises Exchange is making Exchange aware of the EOP spam filtering. This is because EOP uses slightly different logic to stamp the spam results etc. into the message. Exchange Server needs to be aware of this so that it can take action upon those settings.
Extended Protection (EP) was added to Windows back in 2009 as a new security feature. This feature enhances the protection and handling of credentials when authenticating network connections using Integrated Windows Authentication (IWA).
The update itself does not directly provide protection against specific attacks such as credential forwarding, but allows applications to opt-in to Extended Protect… Read the rest “Updated Guidance On Exchange Server Extended Protection”
Extended Protection uses service binding and channel binding to help prevent an authentication relay attack. In an authentication relay attack, a client that can perform NTLM authentication (for example, Windows Explorer, Microsoft Outlook, a .NET SqlClient application, etc.), connects to an attacker (for example, a malicious CIFS file server). The attacker uses the client's credentials to masquer… Read the rest “Exchange Server Extended Protection”
The May 2022 security update for Exchange Server 2013, 2016 and 2019 resolved CVE-2022-21978. A common issue is that admins are only doing part of the work to address this CVE. Yes they are installing the update, but are not reading the rest of the documentation which states that an additional command must be run.
The FAQ states:
Do I need to take further steps to be protected from this vulnerabil… Read the rest “Remediate Exchange Security CVE-2022-21978”
In the field, I’m seeing multiple customers that are struggling to implement the DownloadDomain feature. It does require a little prep work and it is not as simple as just running a single command in Exchange to flip the setting on.
In order to mitigate and issue with OWA, it is necessary to create an additional CAS namespace that will be used for downloading attachments from OWA. This will requir… Read the rest “Implementing Exchange DownloadDomain Security”
When designing an upgrade strategy from an older version of Exchange to a newer one, a question that needs to be addressed is do we need to introduce a version of Exchange that may not currently be present? This may be when upgrading from Exchange 2013 to Exchange 2019. If that organisation currently does not have any Exchange 2016 servers, you need to evaluate if there may be a future requireme… Read the rest “Exchange 2019 Point of No Return”
Exchange 2019 CU12 has been released to the Microsoft Volume Licensing Center and the public Microsoft Download site! Exchange 2019 has a different servicing strategy than Exchange 2007/2010 and utilises Cumulative Updates (CUs) rather than the Rollup Updates (RU/UR) which were used previously. CUs are a complete installation of Exchange 2019 and can be used to install a fresh server or to upd… Read the rest “Exchange 2019 CU12 Released”
Exchange 2016 CU23 has been released to the Microsoft download centre! Exchange 2016 has a different servicing strategy than Exchange 2007/2010 and utilises Cumulative Updates (CUs) rather than the Rollup Updates (RU/UR) which were used previously. CUs are a complete installation of Exchange 2016 and can be used to install a fresh server or to update a previously installed one. Exchange 2013 h… Read the rest “Exchange 2016 CU23 Released”
When discussing network configuration for Office 365, there will be a series of issues and challenges that need to be addressed. Ideally this is all done in a proactive manner, with the final items addressed in the POC phase.
One of the cornerstone issues is around how access to and from Office 365 will be managed. This has to address end user access from workstations and publishing your on-premi… Read the rest “The Way Things Were–EOP IP Ranges October 2018”