Windows Updates in March 2020 add new audit events, additional logging, and a remapping of Group Policy values that will enable hardening LDAP Channel Binding and LDAP Signing. The March 2020 updates do not make changes to LDAP signing or channel binding policies or their registry equivalent on new or existing domain controllers.
A further future monthly update, anticipated for release the second half of calendar year 2020, will enable LDAP signing and channel binding on domain controllers configured with default values for those settings.
LDAP Channel Binding: Change is coming 2nd half of 2020
Although the changes were originally due to drop in January 2020, they are now being delayed until later in the year to give organizations more time to prepare. Only in the second half of 2020 will Microsoft push out changes to enable LDAP signing and channel binding on domain controllers that currently have the default settings.
Similar article:Microsoft enforces secure connections to the Domain Controller from January 2020LDAP Channel Binding: Change is coming 2nd half of 2020Detect insecure LDAP bindings before March 2020 Microsoft Guidance for Enabling LDAP Channel Binding and LDAP Signing
In the second half of 2020, Microsoft is changing the default LDAP signing and channel binding settings on Windows Server Active Directory domain controllers (DC). The new settings will enforce LDAP signing and channel binding.
Next month Microsoft will be changing the default behaviour for LDAP - Cleartext, unsigned LDAP queries against AD (over port 389) will be disabled by default - -gb/help/4520412/2020-ldap-channel-binding-and-ldap-signing-requirement-for-windows . You'll still be able to over-ride that using registry keys or group policy, but the best advice is to configure all LDAP clients to use encrypted, signed LDAPS queries (over port 636).
Domain controller: LDAP server channel binding token requirements group policy.CBT signing events 3039, 3040, and 3041 with event source Microsoft-Windows-ActiveDirectory_DomainService in the Directory Service event log.Important The March 10, 2020 and updates in the foreseeable future will not make changes to LDAP signing or LDAP channel binding policies or their registry equivalent on new or existing domain controllers."
In September, Microsoft had indicated that these LDAP configuration changes would arrive starting in mid-January 2020. However, the revised Security Advisory ADV190023 now suggests that the configuration changes will arrive with the March 2020 Windows updates, but will only get enforced with "a further future monthly update, anticipated for release the second half of calendar year 2020." Microsoft plans send a notice to its customers when the March updates for LDAP channel binding and LDAP signing are available.
Windows Updates in March 2020 add new audit events, additional logging, and a remapping of Group Policy values that will enable hardening LDAP Channel Binding and LDAP Signing. The March 2020 updates do not make changes to LDAP signing or channel binding policies or their registry equivalent on new or existing domain controllers. A future monthly update, anticipated for release in the second half of 2020, will enable LDAP signing and channel binding on domain controllers configured with default values for those settings
Instead "a further future monthly update, anticipated for release the second half of calendar year 2020, will enable LDAP signing and channel binding on domain controllers configured with default values for those settings."
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