Yes, I can confirm that for version 3.7 the steps you have taken are the correct ones to address the CVE-2017-9248 cryptographic weakness. The KB article you have referenced also contains information on how to verify whether the dialog handler has been properly disabled, so you can follow this set of instructions to confirm the successful operation.
At this point this is all the official information we have disclosed and can discuss in public. If you prefer to continue the discussion, or have further follow-up questions, which might necessitate private communication, we would be glad to assist you via our phone or support ticket channels, which you can find listed on the Sitefintiy Support center page
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