Exchange Updates – June 2020

The Exchange Team released the quarterly Cumulative Updates for Exchange Server 2019 as well as Exchange 2016. Like the previous two Cumulative Updates, these require .NET Framework 4.8.

Apart from fixes as well as security updates included from the previous CU, these update contain the following changes for both builds:

  • Added additional file types to default OWA Mailbox Policy for Blocked File Extensions. More information in KB4559446.
  • Added support to Restore-RecoverableItems for easier usage. More details in KB4547707.

Links to the updates as well as a description of changes and fixes are described below.

VersionBuildKBDownloadUMLPSchema
Exchange 2019 CU615.2.659.4KB4556415VLSC N
Exchange 2016 CU1715.1.2044.4KB4556414DownloadUMLPN

Exchange 2019 CU6 fixes:

  • 4559441 Foreign language characters set in RejectMessageReasonText of a transport rule aren’t shown correctly in Exchange Server 2019
  • 4547707 Enable piping for Restore-RecoverableItems in Exchange Server 2019
  • 4549689 HMA EvoSTS certificate rollover causes authentication prompts due to stalled key on worker process spawn (warmup phase) in Exchange Server 2019
  • 4559446 Changes to Outlook on the web blocked file extensions and MIME types in Exchange Server 2019
  • 4559440 Export to a PST for an eDiscovery search fails Exchange Server 2019
  • 4559439 EAS creates failure report if a message with unknown recipients is in Drafts in Exchange Server 2019
  • 4559442 2080 Events caused by empty values in HKLM\SYSTEM\CurrentControlSet\Services\MSExchange ADAccess\Instance0 in Exchange Server 2019
  • 4559438 Edge Transport server hangs in Exchange Server 2019
  • 4559443 Managed Folder Assistant fails with Event ID 9004 NotInBagPropertyErrorException in Exchange Server 2019
  • 4559437 PR_RECIPIENT_ENTRYID is computed if no email address or type in Exchange Server 2019
  • 4559444 Conversion from HTML to RTF removes non-breaking space in Exchange Server 2019
  • 4559436 Attachments with properties (like Azure Information Protection labels) not always matching in Exchange Server 2019
  • 4559435 Introduce an OrganizationConfig flag to enable or disable recipient read session in Exchange Server 2019

Exchange 2016 CU17 fixes:

  • 4559444 Conversion from HTML to RTF removes non-breaking space in Exchange Server 2016
  • 4559435 Introduce an OrganizationConfig flag to enable or disable recipient read session in Exchange Server 2016
  • 4547707 Enable piping for Restore-RecoverableItems in Exchange Server 2019 and 2016
  • 4559436 Attachments with properties (like Azure Information Protection labels) don’t always match in Exchange Server 2016
  • 4559437 PR_RECIPIENT_ENTRYID is computed if no email address or type in Exchange Server 2016
  • 4559438 Edge Transport server hangs in Exchange Server 2016
  • 4559439 EAS creates failure report if a message with unknown recipients is in Drafts in Exchange Server 2016
  • 4559440 Export to a PST for an eDiscovery search fails in Exchange Server 2016
  • 4559441 Foreign language characters set in RejectMessageReasonText of a transport rule aren’t shown correctly in Exchange Server 2016
  • 4559442 2080 Events caused by empty values in HKLM\SYSTEM\CurrentControlSet\Services\MSExchange ADAccess\Instance0 in Exchange Server 2016
  • 4549689 HMA EvoSTS certificate rollover causes authentication prompts due to stalled key on worker process spawn (warmup phase) in Exchange Server 2016
  • 4559443 Managed Folder Assistant fails with Event ID 9004 NotInBagPropertyErrorException in Exchange Server 2016
  • 4559446 Changes to Outlook on the web blocked file extensions and MIME types in Exchange Server 2016

Notes:

  • These Cumulative Updates do not contain schema changes compared to their previous Cumulative Update.
  • When upgrading from an n-2 or earlier version of Exchange, or an early version of the .NET Framework, consult Upgrade Paths for CU’s & .NET.
  • Don’t forget to put the Exchange server in maintenance mode prior to updating. Regardless, setup will put the server in server-wide offline mode post-analysis, before making actual changes.
  • When using Exchange hybrid deployments or Exchange Online Archiving (EOA), you are required to delay installing at most one version (n-1).
  • If you want to speed up the update process for systems without internet access, you can follow the procedure described here to disable publisher’s certificate revocation checking.
  • Cumulative Updates can be installed directly; no need to install RTM prior to installing Cumulative Updates.
  • Once installed, you can’t uninstall a Cumulative Update nor any of the installed Exchange server roles.
  • The order of installation shouldn’t matter with the “every server is an island” concept, yet recommended is to upgrade internet-facing, non-internet-facing servers first, followed by Edge Transports.

Caution:

As for any update, I recommend to thoroughly test updates in a test environment prior to implementing them in production. When you lack such facilities, hold out a few days and monitor the comments on the original publication or forums for any issues.

Exchange Updates – March 2020

The Exchange Team released the quarterly Cumulative Updates for Exchange Server 2019 as well as Exchange 2016. Like the previous Cumulative Updates, these require .NET Framework 4.8. Apart from fixes as well as security updates included from the previous CU, these update contain the following changes for Exchange 2019 CU5:

  • Updated Exchange calculator (v10.4).
  • Fixes an issue with Manage-MetaCacheDatabase.ps1 to configure MCDB.
  • Fixes partial word searches when using Outlook in online mode.

Links to the updates as well as a description of changes and fixes are described below.

VersionBuildKBDownloadUMLPSchema
Exchange 2019 CU515.2.595.3KB4537677VLSC N
Exchange 2016 CU1615.1.1979.3KB4537678DownloadUMLPN

Exchange 2019 CU5 fixes:

  • 4552472 Exchange Server 2019 Sizing Calculator version 10.4 is available
  • 4536552 Export-ModernPublicFolderStatistics.ps1 is not working in Exchange Server 2019
  • 4538303 Exchange 2019 Setup Prerequisite Check fails for .NET 4.8 Framework in CU4 on Windows builds 1909 and 1903
  • 4547705 Authentication loop between msft.sts.microsoft.com/adfs and OWA in Exchange Server 2019
  • 4547706 Birthday isn’t correctly synced to iOS native mail app in Exchange Server 2019
  • 4547708 Elevation of privileges possible when Active Directory permissions role is granted in Exchange Server 2019
  • 4547709 InternetWebProxyBypassList is ignored by Mailbox Replication service in Exchange Server 2019
  • 4547710 New-MailboxSearch with In-Place Hold enabled replaces all values in msExchUserHoldPolicies if adding a value in Exchange Server 2019
  • 4547711 Public folder permissions aren’t applied from Outlook in Exchange Server 2019 hybrid environment
  • 4547712 Outlook on the web (OWA) exposes junk operations even if disabled via OwaMailboxPolicy in Exchange Server 2019
  • 4547713 IsOnlineMeeting is always false for Teams-only meetings in Exchange Server 2019
  • 4547714 Can’t add remote shared mailbox using ECP into distribution group in Exchange Server 2019 hybrid environment
  • 4547715 New created search folder retention policy is changed in Exchange Server 2019
  • 4547719 MCDB status is “Offline” and SSDs are not formatted in Exchange Server 2019
  • 4547720 Partial word searches not working for mailboxes in Outlook online mode in Exchange Server 2019
  • 4547721 Exchange Sizing Calculator still supports mail.que database over 2 TB in Exchange Server 2019
  • 4547722 Can’t go from Office 365 to Enterprise in Exchange Server 2019 Exchange admin center (EAC) if Chrome SameSite Cookie is enabled
  • 4547723 Can’t sign in to Office 365 if configuring hybrid with Chrome SameSite Cookie enabled in Exchange Server 2019
  • 4536987 Description of the security update for Microsoft Exchange Server 2019: February 11, 2020

Exchange 2016 CU16 fixes:

  • 4547705 Authentication loop between msft.sts.microsoft.com/adfs and OWA in Exchange Server 2016
  • 4547706 Birthday isn’t correctly synced to iOS native mail app in Exchange Server 2016
  • 4547708 Elevation of privileges possible when Active Directory permissions role is granted in Exchange Server 2016
  • 4547709 InternetWebProxyBypassList is ignored by Mailbox Replication service in Exchange Server 2016
  • 4547710 New-MailboxSearch with In-Place Hold enabled replaces all values in msExchUserHoldPolicies if adding a value in Exchange Server 2016
  • 4547711 Public folder permissions aren’t applied from Outlook in Exchange Server 2016 hybrid environment
  • 4547712 Outlook on the web (OWA) exposes junk operations even if disabled via OwaMailboxPolicy in Exchange Server 2016
  • 4547713 IsOnlineMeeting is always false for Teams-only meetings in Exchange Server 2016
  • 4547714 Can’t add remote shared mailbox by using ECP into distribution group in Exchange Server 2016 hybrid environment
  • 4547715 New created search folder retention policy is changed in Exchange Server 2016
  • 4547722 Can’t go from Office 365 to Enterprise in Exchange Server 2016 Exchange admin center (EAC) if Chrome SameSite Cookie is enabled
  • 4547723 Can’t sign in to Office 365 if configuring hybrid with Chrome SameSite Cookie enabled in Exchange Server 2016
  • 4547716 Event ID 1325 and Test-ExchangeSearch crashes application pool with NullReferenceException in Exchange Server 2016
  • 4536987 Description of the security update for Microsoft Exchange Server 2016: February 11, 2020

Notes:

  • These Cumulative Updates do not contain schema changes compared to their previous Cumulative Update.
  • When upgrading from an n-2 or earlier version of Exchange, or an early version of the .NET Framework, consult Upgrade Paths for CU’s & .NET.
  • Don’t forget to put the Exchange server in maintenance mode prior to updating. Regardless, setup will put the server in server-wide offline mode post-analysis, before making actual changes.
  • When using Exchange hybrid deployments or Exchange Online Archiving (EOA), you are required to delay installing at most one version (n-1).
  • If you want to speed up the update process for systems without internet access, you can follow the procedure described here to disable publisher’s certificate revocation checking.
  • Cumulative Updates can be installed directly; no need to install RTM prior to installing Cumulative Updates.
  • Once installed, you can’t uninstall a Cumulative Update nor any of the installed Exchange server roles.
  • The order of installation shouldn’t matter with the “every server is an island” concept, yet recommended is to upgrade internet-facing, non-internet-facing servers first, followed by Edge Transports.

Caution:

As for any update, I recommend to thoroughly test updates in a test environment prior to implementing them in production. When you lack such facilities, hold out a few days and monitor the comments on the original publication or forums for any issues.

Security Updates Exchange 2010-2019

A quick blog on recently published security updates for Exchange Server 2013 up to Exchange Server 2019 and Exchange Server 2010 as well. These fixes address the following vulnerabilities:

  • CVE-2020-0692: Microsoft Exchange Server Elevation of Privilege Vulnerability

An elevation of privilege vulnerability exists in Microsoft Exchange Server. An attacker who successfully exploited this vulnerability could gain the same rights as any other user of the Exchange server. This could allow the attacker to perform activities such as accessing the mailboxes of other users. Exploitation of this vulnerability requires Exchange Web Services (EWS) to be enabled and in use in an affected environment. To exploit the vulnerability, an attacker would need to change parameters in the Security Access Token and forward it to a Microsoft Exchange Server, thereby allowing impersonation of another Exchange user. To address this vulnerability, Microsoft has changed the way EWS handles these tokens.
This vulnerability does not apply to Exchange 2010.

  • CVE-2020-0688: Microsoft Exchange Memory Corruption Vulnerability

A remote code execution vulnerability exists in Microsoft Exchange Server when the server fails to properly create unique keys at install time. Knowledge of a the validation key allows an authenticated user with a mailbox to pass arbitrary objects to be deserialized by the web application, which runs as SYSTEM. The security update addresses the vulnerability by correcting how Microsoft Exchange creates the keys during install.

The CVE documents contain more details on the vulnerabilities. In addition, KB4536989 (Rollup 30) for Exchange 2010 and KB4536988 for Exchange 2013 also fixes the following issue:

  • KB4540267 MSExchangeDelivery.exe or EdgeTransport.exe crashes in Exchange Server 2013 and Exchange Server 2010

The exploits can be fixed by single security update, which you can find in the table below per current Exchange version.

ExchangeDownloadBuildKBSupersedes
Exchange 2019 CU4Download15.2.529.8KB4536987KB4523171
Exchange 2019 CU3Download15.2.464.11KB4536987KB4523171
Exchange 2016 CU15Download15.1.1913.7KB4536987KB4523171
Exchange 2016 CU14Download15.1.1847.7KB4536987KB4523171
Exchange 2013 CU23Download15.0.1497.6KB4536988KB4523171
Exchange 2010 SP3 RU30KB4536989KB4509410

Be advised that the Security Updates for Exchange 2013-2019 are Cumulative Update level specific. Unfortunately, the security update carries the same name for different CUs, and you cannot apply the update for Exchange 2016 CU15 to Exchange 2016 CU14. I would suggest tagging the Cumulative Update in the file name used, e.g. Exchange2016-CU15-KB4536987-x64-en.msp.

Also, run the Security Update from an elevated command prompt, to prevent issues during installation. And on a final note, as with any patch or update, I’d recommend to apply this in a acceptance environment first, prior to implementing it in production.

Exchange Updates – December 2019

Exchange2019Logo

The Exchange Team released the quarterly Cumulative Updates for Exchange Server 2019 as well as Exchange 2016. One significant change with these updates is the requirement for .NET Framework 4.8, as announced earlier. Also, Exchange 2019 CU4 comes with an updated Exchange calculator. Links to the updates as well as a description of changes and fixes are described below.

VersionBuildKBDownloadUMLPSchema
Exchange 2019 CU415.2.529.5 KB4522149VLSC N
Exchange 2016 CU1515.1.1913.5 KB4522150DownloadUMLPN

Exchange 2019 CU4 fixes:

  • 4528696 Exchange PowerShell cmdlets take longer time to run in Exchange Server 2019
  • 4528695 Event ID 4009 when using SubjectOrBodyMatchesPatterns on Edge server in Exchange Server 2019
  • 4528694 Can’t open .ics file in Outlook on the web in Exchange Server 2019
  • 4528692 “A parameter was specified that isn’t valid” error when creating transport rule in Exchange Server 2019
  • 4523519 Set-SendConnector doesn’t work for Exchange Server in hybrid scenarios with Edge Server installed
  • 4528688 Only one recipient shows when saving draft by using Exchange ActiveSync version 16.0 in Exchange Server 2019
  • 4528693 Get-CalendarDiagnosticLog is proxied for queries within the same forest in Exchange Server 2019
  • 4528687 NotificationClient logs aren’t purged and consume lots of disk in Exchange Server 2019
  • 4528689 Outlook on the web shows MailTip when recipients equal the large audience size in Exchange Server 2019
  • 4528690 Can’t move or delete folder in Outlook online mode if the destination has a folder with the same name in Exchange Server 2019
  • 4532744 System.ArgumentNullException when you use Set-user to assign block legacy auth policy in Exchange Server 2019
  • 4532747 Address list separation not working for a user without a mailbox in Exchange Server 2019
  • 4523171 Description of the security update for Microsoft Exchange Server 2019, 2016, and 2013: November 12, 2019

Exchange 2016 CU15 fixes:

  • 4515256 “The function cannot be performed…” error when you send a message that’s open for a long time in Exchange Server 2016
  • 4528693 Get-CalendarDiagnosticLog is proxied for queries within the same forest in Exchange Server 2016
  • 4523519 Set-SendConnector doesn’t work for Exchange Server in hybrid scenarios with Edge Server installed
  • 4528690 Can’t move or delete folder in Outlook online mode if the destination has a folder with the same name in Exchange Server 2016
  • 4528687 NotificationClient logs aren’t purged and consume lots of disk in Exchange Server 2016
  • 4528689 Outlook on the web shows MailTip when recipients equal the large audience size in Exchange Server 2016
  • 4528688 Only one recipient shows when saving draft by using Exchange ActiveSync version 16.0 in Exchange Server 2016
  • 4528695 Event ID 4009 when using SubjectOrBodyMatchesPatterns on Edge server in Exchange Server 2016
  • 4528694 Can’t open .ics file in Outlook on the web in Exchange Server 2016
  • 4528692 “A parameter was specified that isn’t valid” error when creating transport rule in Exchange Server 2016
  • 4515257 Hash mismatch is reported for Exchange DLLs in the bin directory of Exchange Server 2016
  • 4528696 Exchange PowerShell cmdlets take longer time to run in Exchange Server 2016
  • 4532747 Address list separation not working for a user without a mailbox in Exchange Server 2016
  • 4523171 Description of the security update for Microsoft Exchange Server 2019, 2016, and 2013: November 12, 2019

Notes:

  • These Cumulative Updates do not contain schema changes compared to their previous Cumulative Update.
  • When upgrading from an n-2 or earlier version of Exchange, or an early version of the .NET Framework, consult Upgrade Paths for CU’s & .NET.
  • Don’t forget to put the Exchange server in maintenance mode prior to updating. Regardless, setup will put the server in server-wide offline mode post-analysis, before making actual changes.
  • When using Exchange hybrid deployments or Exchange Online Archiving (EOA), you are required to delay installing at most one version (n-1).
  • If you want to speed up the update process for systems without internet access, you can follow the procedure described here to disable publisher’s certificate revocation checking.
  • Cumulative Updates can be installed directly; no need to install RTM prior to installing Cumulative Updates.
  • Once installed, you can’t uninstall a Cumulative Update nor any of the installed Exchange server roles.
  • The order of installation shouldn’t matter with the “every server is an island” concept, yet recommended is to upgrade internet-facing, non-internet-facing servers first, followed by Edge Transports.

Caution:

As for any update, I recommend to thoroughly test updates in a test environment prior to implementing them in production. When you lack such facilities, hold out a few days and monitor the comments on the original publication or forums for any issues.

Security Updates Exchange 2013-2019

Exchange2019LogoA quick blog on recently published security updates for Exchange Server 2013 up to Exchange Server 2019. These fixes address the following vulnerabilities:

  • CVE-2019-1373: Microsoft Exchange Remote Code Execution Vulnerability

The CVE documents contain more details on the vulnerabilities. The exploits can be fixed by single security update, which you can find in the table below per current Exchange version.

ExchangeDownloadBuildKBSupersedes
Exchange 2019 CU3Download15.2.464.7 KB4523171KB4515832
Exchange 2019 CU2Download15.2.397.9 KB4523171 KB4515832
Exchange 2016 CU14Download15.1.1847.5 KB4523171 KB4515832
Exchange 2016 CU13Download15.1.1779.7 KB4523171 KB4515832
Exchange 2013 CU23Download15.0.1497.4 KB4523171 KB4509409

Be advised that the Security Updates for Exchange 2013-2019 are Cumulative Update level specific. Unfortunately, the security update carries the same name for different CUs, and you cannot apply the update for Exchange 2016 CU14 to Exchange 2016 CU13. I would suggest tagging the Cumulative Update in the file name when you store it, e.g. Exchange2016-CU14-KB4523171-x64-en.msp.

As with any patch or update, I’d recommend to apply this in a acceptance environment first, prior to implementing it in production.

Exchange Updates – Sep. 2019

Exchange2019LogoToday, the Exchange Team released the quarterly Cumulative Updates for Exchange Server 2019 as well as Exchange 2016. The fixes in each release, product downloads are described below:

VersionBuildKBDownloadUMLPSchema
Exchange 2019 CU315.2.464.5KB4514141VLSC N
Exchange 2016 CU1415.1.1847.3KB4514140DownloadUMLPN

Exchange 2019 CU3 fixes:

  • 4515257 Hash mismatch is reported for Exchange DLLs in the bin directory of Exchange Server 2019
  • 4502159 Adding or removing mailbox permission in EAC doesn’t address the msExchDelegateListLink attribute in Exchange Server 2019 and 2016
  • 4515276 Room mailbox accepts a meeting as “Free” if a booking delegate is set in Exchange Server 2019 and 2016
  • 4515275 Enable Get/Restore-RecoverableItems to work with Purges folder in Exchange Server 2019 and 2016
  • 4515274 AutodiscoverV2 request returns REST API endpoint not AutoDiscoverV1 endpoint in Exchange Server 2019 and 2016
  • 4515269 SentToMemberOf shows every recipient type not distribution groups when you create transport rule in Exchange Server 2019 and 2016
  • 4515272 Message is blocked in “SMTP Delivery to Mailbox” queue if exchange server is added in groups of a child domain in Exchange Server 2019 and 2016
  • 4515271 Can’t convert a migrated remote user mailbox to shared in Exchange Server 2019 and 2016
  • 4515270 SubmissionQueueLengthMonitor shows “System.ArgumentException: Transition timeout…” in Exchange Server 2019 and 2016
  • 4515267 NDR occurs when you resend message from alternate journaling mailbox to journaling mailbox in Exchange Server 2019 and 2016
  • 4515265 Removing In-Place Hold doesn’t work for mailboxes in different domains in Exchange Server 2019 and 2016
  • 4515264 FindPeople request from Skype for Business on Mac fails with “Invalid Shape Specification” in Exchange Server 2019 and 2016
  • 4515263 Hide the “Validate-MailFlowThroughFrontDoor” command for Exchange Server 2019 and 2016
  • 4515262 Enable Remove-MobileDevice to delete mobile devices after migrating to Office 365 from Exchange Server 2019 and 2016
  • 4515261 Can’t copy eDiscovery search results for mailboxes with Exchange online archives in Office 365 in Exchange Server 2019 and 2016
  • 4515273 Mailbox auditing fails when using SHA1Managed in Exchange Server 2019 and 2016
  • 4515266 Infinite loop in Recurrence.GetNumberOfYearsBetween() with the Japanese calendar in Exchange Server 2019 and 2016
  • 4520319 S/MIME signed reply draft behaves like the first message in conversation in Exchange Server 2019 and 2016
  • 4515832 Description of the security update for Microsoft Exchange Server 2019 and 2016: September 10, 2019

Exchange 2016 CU14 fixes:

  • 4515255 â€śX-InnerException: Microsoft.Mapi.MapiExceptionRpcServerTooBusy” error when you try to use a mailbox in Exchange Server 2016
  • 4515254 Event 1009 frequently occurs in application logs for lagged database copies in Exchange Server 2016
  • 4502159 Adding or removing mailbox permission in EAC doesn’t address the msExchDelegateListLink attribute in Exchange Server 2016
  • 4515276 Room mailbox accepts a meeting as “Free” if a booking delegate is set in Exchange Server 2016
  • 4515275 Enable Get/Restore-RecoverableItems to work with Purges folder in Exchange Server 2016
  • 4515274 AutodiscoverV2 request returns REST API endpoint not AutoDiscoverV1 endpoint in Exchange Server 2016
  • 4515269 SentToMemberOf shows every recipient type not distribution groups when creating transport rule in Exchange Server 2016
  • 4515272 Message is blocked in “SMTP Delivery to Mailbox” queue if exchange server is added in groups of a child domain in Exchange Server 2016
  • 4515271 Can’t convert a migrated remote user mailbox to shared in Exchange Server 2016
  • 4515270 SubmissionQueueLengthMonitor shows “System.ArgumentException: Transition timeout…” in Exchange Server 2016
  • 4515267 NDR occurs when you resend message from alternate journaling mailbox to journaling mailbox in Exchange Server 2016
  • 4515265 Removing In-Place Hold doesn’t work for mailboxes in different domains in Exchange Server 2016
  • 4515264 FindPeople request from Skype for Business on Mac fails with “Invalid Shape Specification” in Exchange Server 2016
  • 4515263 Hide the “Validate-MailFlowThroughFrontDoor” command for Exchange Server 2016
  • 4515262 Enable Remove-MobileDevice to delete mobile devices after migrating to Office 365 from Exchange Server 2016
  • 4515261 Can’t copy eDiscovery search results for mailboxes with Exchange online archives in Office 365 in Exchange Server 2016
  • 4515273 Mailbox auditing fails when you use SHA1Managed in Exchange Server 2016
  • 4515266 Infinite loop in Recurrence.GetNumberOfYearsBetween() with the Japanese calendar in Exchange Server 2016
  • 4520319 S/MIME signed reply draft behaves like the first message in conversation in Exchange Server 2016
  • 4515832 Description of the security update for Microsoft Exchange Server 2019 and 2016: September 10, 2019

Notes:

  • These Cumulative Updates do not contain schema changes compared to their previous Cumulative Update.
  • When upgrading from an n-2 or earlier version of Exchange, or an early version of the .NET Framework, consult Upgrade Paths for CU’s & .NET.
  • Don’t forget to put the Exchange server in maintenance mode prior to updating. Regardless, setup will put the server in server-wide offline mode post-analysis, before making actual changes.
  • When using Exchange hybrid deployments or Exchange Online Archiving (EOA), you are required to delay installing at most one version (n-1).
  • If you want to speed up the update process for systems without internet access, you can follow the procedure described here to disable publisher’s certificate revocation checking.
  • Cumulative Updates can be installed directly; no need to install RTM prior to installing Cumulative Updates.
  • Once installed, you can’t uninstall a Cumulative Update nor any of the installed Exchange server roles.
  • The order of installation shouldn’t matter with the “every server is an island” concept, yet recommended is to upgrade internet-facing, non-internet-facing servers first, followed by Edge Transports.

Caution:

As for any update, I recommend to thoroughly test updates in a test environment prior to implementing them in production. When you lack such facilities, hold out a few days and monitor the comments on the original publication or forums for any issues.

Security Updates Exchange 2016 & 2019 (Sep2019)

Today, Microsoft published security fixes for Exchange Server 2016 and 2019. These fixes address the following vulnerabilities:

The CVE documents contain more details on the vulnerabilities. These exploits can be fixed by single security updates; you can download them here:

VersionLinksBuildKB
2019 CU2Download15.2.397.6KB4515832
2019 CU1Download15.2.330.10KB4515832
2016 CU13Download15.1.1779.5KB4515832
2016 CU12Download15.1.1713.9KB4515832

Note: KB4515832 supersedes KB4509409 and KB4509408.

Be advised that these Security Updates are Cumulative Update level specific. Unfortunately, the security update carries the same name for different CU’s, and you cannot apply the same update for Exchange 2016 CU13 to Exchange 2016 CU12. I would suggest tagging the Cumulative Update in the file name when you store it, e.g. Exchange2016-KB4515832-x64-en_CU11.msp.

As with any patch or update, I’d recommend to apply this in a acceptance environment first, prior to implementing it in production.

Exchange Hybrid Agent GA

Ex2013 LogoIn February, Microsoft released the initial public preview version of the Hybrid Agent. The purpose of the Hybrid Agent, also branded as the “Exchange Modern Hybrid Topology”, is to simplify the process of setting up and deploying Microsoft Exchange Hybrid for Exchange 2010 and later deployments, where full “classic” Exchange Hybrid is not an option.

It can also address scenarios where deploying the Hybrid Agent would satisfy organizational migration requirements. For example, moving mailboxes between Exchange Online and Exchange on-premises while providing rich-coexistence features, but without requiring (re)configuration of the publishing of Exchange services. Other functionality the Hybrid Agent doesn’t offer is mail transport. Future builds of the Hybrid Agent might introduce cross-premises functionality, such as Send As delegations as demonstrated at Microsoft Ignite last year.

This week, the Hybrid Agent Public reached General Availability status. In the following article for ENow, I discuss the major changes in the agent since the initial Preview release.

Read the full article on the ENow Software blog.

ADV190018: Security Updates Exchange 2013-2019 & 2010

Ex2013 LogoUpdated Jun13: Corrected Ex2010SP3RU28 link

A quick note that an update was released for current Exchange versions as well as Exchange 2010 related to the following advisory:

  • ADV190018 Microsoft Exchange Server Defense in Depth Update

Unfortunately – or perhaps understandably – the advisory doesn’t present any more details than, ‘”Microsoft has released an update for Microsoft Exchange Server that provides enhanced security as a defense in depth measure.”.

You can download the security updates here:

Be advised that the Security Updates for Exchange 2013-2019 are Cumulative Update level specific. Unfortunately, the security update carries the same name for different CU’s, and you cannot apply the update for Exchange 2016 CU12 to Exchange 2016 CU11. I would suggest tagging the Cumulative Update in the file name when you store it, e.g. Exchange2016-KB4503027-x64-en_CU11.msp.

As with any patch or update, I’d recommend to apply this in a acceptance environment first, prior to implementing it in production.

Exchange Updates – February 2019

Update: Added note that Exchange 2010 SP3 RU26 adds support for Windows Server 2012 R2.

Today, the Exchange Team released the overdue quarterly Cumulative Updates for Exchange Server 2013, Exchange 2016 and Exchange 2019, as well as a Rollup for Exchange Server 2010.

The KB articles that describe the fixes in each release and product downloads are available as follows:

Version Build KB Download UMLP Schema
Exchange 2019 CU1 15.2.330.5 KB4471391 VLSC N
Exchange 2016 CU12 15.1.1713.5 KB4471392 Download UMLP N
Exchange 2013 CU22 15.0.1473.3 KB4345836 Download UMLP N
Exchange 2010 SP3 RU26 14.3.442.0 KB4487052 Download N

This update contain the following important changes and notes:

  • Due to issue CVE-2018-8581, the EWS architecture was changed, in particular push notifications. Details on the change are described in KB4490060; while the change has been tested against EWS clients such as Outlook for Mac and Skype for Business, organizations may need to test any applications leveraging EWS to estimate potential impact of installing these Cumulative Updates or Rollup. In addition, organizations are advised to password reset Exchange computer accounts.
  • These Exchange builds introduces a change in the shared permissions model (this does not apply to Split Permissions Model). Result is that Exchange no longer requires fargoing permissions in Active Directory (e.g. WriteDACL on root of domain). To makes these changes become effective:
    • For Exchange 2013-2019 Cumulative Updates, run setup using /PrepareAD. In multi-forest environments, this needs to be done in every domain of the forest.
    • For Exchange 2010, go through the instructions mentioned in KB4490059.
  • Organizations considering moving to the Split Permissions because of CVE-2018-8581 should know Microsoft fully supports both models. Switching can have serious consequences and therefor should be fully evaluated.
  • This build of Exchange 2019 introduces cmdlets to block usage of legacy authentication protocols for users through policies, e.g. Basic Authentication.
  • Prior to deploying Exchange 2016 CU12 or Exchange 2013 CU22 on Edge Transport servers, install Visual C++ 2012 Runtime.
  • These Cumulative Updates will remove the DisableLoopbackCheck key when present; removing this key was a mitigation for CVE-2018-8581.
  • Exchange 2010 SP3 RU26 adds support for Windows Server 2012 R2, to accommodate for the Hybrid Agent.

Exchange 2019 CU1 fixes:

  • 4487596 Emails are blocked in moderator mailbox Outbox folder when you send large volumes of emails in Exchange Server 2019
  • 4487591 The recipient scope setting doesn’t work for sibling domains when including OUs in the scope in Exchange Server 2019
  • 4487602 Outlook for Mac users can still expand a distribution group when hideDLMembership is set to true in Exchange Server 2019
  • 4488076 Outlook on the Web can’t be loaded when users use an invalid Windows language in operating system in Exchange Server 2019
  • 4488079 Exchange Server 2016 allows adding Exchange Server 2019 mailbox server into a same DAG and vice versa
  • 4488263 X-MS-Exchange-Organization-BCC header isn’t encoded correctly in Exchange Server 2019
  • 4488080 New-MigrationBatch doesn’t honor RBAC management scope in Exchange Server 2019
  • 4488262 Delivery Reports exception when tracking a meeting request that’s sent with a room resource in Exchange Server 2019
  • 4488268 Disable the irrelevant Query logs that’re created in Exchange Server 2019
  • 4488267 Test-OAuthConnectivity always fails when Exchange Server uses proxy to connect to Internet in Exchange Server 2019
  • 4488266 Client application doesn’t honor EwsAllowList in Exchange Server 2019
  • 4488265 “There are problems with the signature” error occurs for digital signature message if attachment filtering is enabled in Exchange Server 2019
  • 4488398 “The Microsoft Exchange Replication service may not be running on server” error when you add a mailbox database copy in Exchange Server 2019
  • 4488264 Mailbox that has a bad move request can’t be cleaned up from destination mailbox database in Exchange Server 2019
  • 4488261 Event ID 1002 when the store worker process crashes in Exchange Server 2019
  • 4488260 New-MailboxExportRequest and New-MailboxImportRequest don’t honor RBAC management scope in Exchange Server 2019
  • 4488259 MailTip shows wrong number of users for a distribution group if the users are in different domains in Exchange Server 2019
  • 4488258 OAuth authentication is removed when saving MAPI virtual directory settings in EAC in Exchange Server 2019
  • 4490060 Exchange Web Services Push Notifications can be used to gain unauthorized access
  • 4490059 Reducing permissions required to run Exchange Server using Shared Permissions Model

Exchange 2016 CU12 fixes:

  • 4487596 Emails are blocked in moderator mailbox Outbox folder when you send large volumes of emails in Exchange Server 2016
  • 4456241 You receive a meeting request that has a “not supported calendar message.ics” attachment in Exchange Server 2016
  • 4456239 New-MailboxRepairRequest doesn’t honor RBAC RecipientWriteScope restrictions in Exchange Server 2016
  • 4487591 The recipient scope setting doesn’t work for sibling domains when including OUs in the scope in Exchange Server 2016
  • 4468363 MRM does not work for mailboxes that have an online archive mailbox in Exchange Server
  • 4487603 “The action cannot be completed” error when you select many recipients in the Address Book of Outlook in Exchange Server 2016
  • 4487602 Outlook for Mac users can still expand a distribution group when hideDLMembership is set to true in Exchange Server 2016
  • 4488076 Outlook on the Web can’t be loaded when users use an invalid Windows language in operating system in Exchange Server 2016
  • 4488079 Exchange Server 2016 allows adding Exchange Server 2019 mailbox server into a same DAG and vice versa
  • 4488077 Can’t configure voice mail options when user is in different domain in Exchange Server 2016
  • 4488263 X-MS-Exchange-Organization-BCC header isn’t encoded correctly in Exchange Server 2016
  • 4488080 New-MigrationBatch doesn’t honor RBAC management scope in Exchange Server 2016
  • 4488262 Delivery Reports exception when tracking a meeting request that’s sent with a room resource in Exchange Server 2016
  • 4488268 Disable the irrelevant Query logs that’re created in Exchange Server 2016
  • 4488267 Test-OAuthConnectivity always fails when Exchange Server uses proxy to connect to Internet in Exchange Server 2016
  • 4488266 Client application doesn’t honor EwsAllowList in Exchange Server 2016
  • 4488265 “There are problems with the signature” error occurs for digital signature message if attachment filtering is enabled in Exchange Server 2016
  • 4488264 Mailbox that has a bad move request can’t be cleaned up from destination mailbox database in Exchange Server 2016
  • 4488261 Event ID 1002 when the store worker process crashes in Exchange Server 2016
  • 4488260 New-MailboxExportRequest and New-MailboxImportRequest don’t honor RBAC management scope in Exchange Server 2016
  • 4488259 MailTip shows wrong number of users for a distribution group if the users are in different domains in Exchange Server 2016
  • 4488258 OAuth authentication is removed when saving MAPI virtual directory settings in EAC in Exchange Server 2016
  • 4490060 Exchange Web Services Push Notifications can be used to gain unauthorized access
  • 4490059 Reducing permissions required to run Exchange Server using Shared Permissions Model

Exchange 2013 CU22 fixes:

  • 4487603 “The action cannot be completed” error when you select many recipients in the Address Book of Outlook in Exchange Server 2013
  • 4490060 Exchange Web Services Push Notifications can be used to gain unauthorized access
  • 4490059 Reducing permissions required to run Exchange Server using Shared Permissions Model

Exchange 2010 SP3 RU26 fixes:

  • 4490060 Exchange Web Services Push Notifications can be used to gain unauthorized access

Notes:

  • These Cumulative Updates do not contain schema changes compared to their previous Cumulative Update. However, due to changes in the permissions architecture, you need to run setup /PrepareAD to implement these changes as well as apply any RBAC changes, before deploying or updating Exchange servers.
  • When upgrading from an n-2 or earlier version of Exchange, or an early version of the .NET Framework, consult Upgrade Paths for CU’s & .NET.
  • Don’t forget to put the Exchange server in maintenance mode prior to updating. Regardless, setup will put the server in server-wide offline mode post-analysis, before making actual changes.
  • When using Exchange hybrid deployments or Exchange Online Archiving (EOA), you are required to delay installing at most one version (n-1).
  • If you want to speed up the update process for systems without internet access, you can follow the procedure described here to disable publisher’s certificate revocation checking.
  • Cumulative Updates can be installed directly; no need to install RTM prior to installing Cumulative Updates.
  • Once installed, you can’t uninstall a Cumulative Update nor any of the installed Exchange server roles.
  • The order of installation shouldn’t matter with the “every server is an island” concept, yet recommended is to upgrade internet-facing, non-internet-facing servers first, followed by Edge Transports.

Caution:

As for any update, I recommend to thoroughly test updates in a test environment prior to implementing them in production. When you lack such facilities, hold out a few days and monitor the comments on the original publication or forums for any issues.