Hi all!On 8th of July, Microsoft will release an important security update for Active Directory Domain Controllers for Windows Server versions prior to 2025.
This update includes a change to the Microsoft RPC Netlogon protocol, which improves security by tightening access checks for a set of RPC requests. Samba running as domain members in these environments will be impacted by this change if a specific configuration is used, see below for which configuration is affected.
Windows Server version 2025 is already equipped with these specific security hardenings, and Microsoft is now planning to deploy them to all supported Windows Server versions down to Windows Server 2008.
Who is affected?Samba installations acting as member servers in Windows AD domains will be affected if they are configured to use the 'ad' idmapping backend. Samba servers not using this configuration will not be affected by the change – at least to our current knowledge and understanding of the change – and no further action is required.
Current versions of Samba with the affected configuration will no longer function correctly once the Microsoft update has been applied. Users will not be able to connect to the SMB service provided by Samba for any domain configured to use the 'ad' idmapping backend.
What the Samba Team is doing and what you should doMembers of the Samba team have been collaborating with Microsoft and changes to Samba are currently being developed and tested to ensure full compatibility between Samba and Microsoft products. The Samba team is aiming to provide updated Samba releases on Monday evening (UTC+2).
What you should do:If you’re running Samba in a Windows AD environment, check your configuration. Keep an eye out for new Samba package updates early next week (starting 7 July).
References https://bugzilla.samba.org/show_bug.cgi?id=15876 On behalf of the Samba team -slow
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