Add Microsoft Entra Cloud Sync provisioning agent and sync role as Tier Zero - #16
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…er Zero Cloud Sync's provisioning agent server and gMSA are the Cloud Sync equivalent of the Entra Connect server and AD DS Connector Account. Microsoft's own docs call the agent server Tier 0 and document that the gMSA gets DCSync rights (Replicating Directory Changes/Changes All) on the domain root by default at install, independent of whether Password Hash Sync is turned on as a feature. Also add the Directory Synchronization Accounts role/service account used by both Connect Sync and Cloud Sync, scoped IT DEPENDS since its explicit permissions were hardened by Microsoft in August 2024 and the remaining risk (password reset/group manipulation via an undocumented API, per Tenable's April 2025 follow-up) depends on which hybrid identities are in scope, unlike the two Cloud Sync entries which are backed by Microsoft's own Tier 0 language.
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ChangesEntra Cloud Sync asset catalog
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Inline comments:
In `@TierZeroTable.json`:
- Line 919: Update the Description for the Directory Synchronization Accounts
role to acknowledge Microsoft’s documented
microsoft.directory/onPremisesSynchronization/standard/read permission, while
keeping the separate Tenable-reported undocumented API behavior clearly
distinct.
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TierZeroTable.json
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CodeRabbit correctly flagged that the role's explicit permission, microsoft.directory/onPremisesSynchronization/standard/read, is documented on Microsoft's current permissions reference page. Name it instead of saying the role has no documented permissions, while keeping that distinct from Tenable's separate undocumented-API finding.
mnemonic's research names the concrete API (adminwebservice.microsoftonline.com/provisioningservice.svc) behind the account's reach into synced identities: it can mint new sync principals with a cleartext password, reset synchronized users' passwords, and pivot from a User Principal to reset a Service Principal's certificate. Replaces the vaguer "an undocumented API" phrasing with a named source and concrete actions.
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Cloud Sync is the "replacement" (I think) for Entra connect Sync. This has a provisioning agent server and gMSA which both are the Cloud Sync equivalent of the Entra Connect server and AD DS Connector Account. Microsoft's own docs call the agent server Tier 0, and state that the gMSA gets DCSync rights (Replicating Directory Changes/Changes All) on the domain root by default at install. They get this independently of whether Password Hash Sync is turned on as a feature.
I also here add the Directory Synchronization Accounts role/service account used by both Connect Sync and Cloud Sync. This one is a bit tricky and may warrant some testing in a lab to check if it is still vulnerable. I set this entry to IT DEPENDS since the account's explicit permissions were hardened by Microsoft in August 2024, and the remaining risk (password reset/group manipulation via an undocumented API, per Tenable's April 2025 follow-up) depends on which hybrid identities are in scope.
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