Windows Update 3072630 and Custom Action

[DaveC]

Windows Update 3072630 and Custom Action
EDIT: I corrected the title. Should be line above...

Since July 15th users have complained that our MSI installer can fail (ver 2.1.1011). We see it fails during a Custom Action that launches a DLL that does writing to registry and creates some files.
We found this

https://technet.microsoft.com/en-us/library/security/ms15-074.aspx

Do you think there is a problem with running Custom Actions after this Windows security fix.
Thanks

[DaveC]

If we disable Windows Update 3072630

https://support.microsoft.com/en-us/kb/3072630

the MSI Custom Action Dll runs fine.
It seems to be a security issue related to the permissions passed to the DLL by the Custom Action.

[Ulrich]

As I understand it, you may need to perform the actions differently. If you require writing into the registry, possibly you can use Windows Installer's own functions for that instead of using a DLL.

Ulrich