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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2020.0454 Updated Microsoft guidance about upcoming changes to LDAP Channel Binding and LDAP Signing 7 February 2020 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Active Directory Publisher: Microsoft Operating System: Windows Resolution: None Original Bulletin: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV190023 - --------------------------BEGIN INCLUDED TEXT-------------------- ************************************************************************************ Title: Microsoft Security Update Minor Revisions Issued: February 4, 2020 ************************************************************************************ Summary ======= The following advisory has undergone a minor revision increment: * ADV190023 Revision Information: ===================== - ADV190023 | Microsoft Guidance for Enabling LDAP Channel Binding and LDAP Signing - https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV190023 - Reason for Revision: In the Recommended Actions section, added information that details what will be included in the March 2020 updates to enable hardening LDAP Channel Binding and LDAP Signing. Included information about a future monthly update that will LDAP signing and channel binding on domain controllers configured with default values for those settings. These are informational changes only. - Originally posted: August 13, 2019 - Updated: February 4, 2020 - Aggregate CVE Severity Rating: N/A - Version: 1.3 Executive Summary: ===================== LDAP channel binding and LDAP signing provide ways to increase the security for communications between LDAP clients and Active Directory domain controllers. A set of unsafe default configurations for LDAP channel binding and LDAP signing exist on Active Directory Domain Controllers that let LDAP clients communicate with them without enforcing LDAP channel binding and LDAP signing. This can open Active directory domain controllers to elevation of privilege vulnerabilities. This advisory addresses the issue by recommending a new set of safe default configurations for LDAP channel binding and LDAP signing on Active Directory Domain Controllers that supersedes the original unsafe configuration. Recommended Actions: ===================== 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. Administrators can prevent the feature update from making those change either by enabling LDAP signing and channel binding NOW or by configuring non-default values prior to installing updates that enable LDAP signing and channel binding by default. When the March 2020 Windows updates become available, customers will be notified via a revision to this advisory. If you wish to be notified when these update are released, we recommend that you register for the security notifications mailer to be alerted of content changes to this advisory. See Microsoft Technical Security Notifications. In the meantime, we strongly advise customers to take the following steps at the earliest opportunity: - - Configure your systems to help make LDAP channel binding and LDAP signing on Active Directory Domain Controllers more secure. - - Find and fix any application compatibility issues in the environment. Other Information ================= Recognize and avoid fraudulent email to Microsoft customers: ============================================================= If you receive an email message that claims to be distributing a Microsoft security update, it is a hoax that may contain malware or pointers to malicious websites. Microsoft does not distribute security updates via email. The Microsoft Security Response Center (MSRC) uses PGP to digitally sign all security notifications. However, PGP is not required for reading security notifications, reading security bulletins, or installing security updates. You can obtain the MSRC public PGP key at <https://technet.microsoft.com/security/dn753714>. ******************************************************************** THE INFORMATION PROVIDED IN THIS MICROSOFT COMMUNICATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. 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The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://www.auscert.org.au/bulletins/ =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBXjz5qmaOgq3Tt24GAQiwYA/9FKOriqq/M49FbKhJ9UeozPmdfHfQmfo5 tqBMi9VfJdD76PG8+5impvrRhaUv+nn+uMr7BGrvGpzPaQKxsmTgwVOSShf6QdTS COkPulktaJXjL7FXNU8uZhDdiYXayqgFL19IqxWFmxsQ57zOgfsd1LwTXSwcuLAx 3gXWewLbmi5fubY8TqbSW9pfDLCYThAcLYXDe2zeshUAw8nI0QgJyUJ0Eti4edyY BMGM8qxcmsyVGFdz/rrBwdtLDmv+9QFYPTdi+rDlYdFgETG/BSK2LNU5CPTDRoLF J7vmylrNrfrSwOahw9Pmb1yqkc6Dxt+1Ndc75Gz2xJl8kzmDAzQwe4VWZpDBt61/ r7qwzpecoW15HEHYJQk98aCH/EOwWMjOpikB0vOgILjxZjGgZddRfAoPzqK1/ROg gkps83wu2eawxJqDlYbFKtUrLLr/cSToz7N+41tFyxB2PH44wsQT7bY7Tj6+8zZz lAqPOYen7mD7OThrnTPsrzmwD6dmH3SjhdV/E2VIB91NTbgkWBalzbCF+D9KcPxv zuiH4u6gnL3WV7fN5OcNGug0ACN4EhhPdq0EjQWE5CUSbclkDgHcEBDNnDXaJLpO c7A+PWMgmTGTMekCIagmJc6uBoT/0dOFWR7yD8DqbTfgS8FE1Riozay9py9W29Tl LRZfQpWN0vI= =OiU5 -----END PGP SIGNATURE-----