Bug: Service Principal App ID node property displaying Service Principal Object ID instead of App ID

[Mayyhem]

Description:

The node entity panel for AZServicePrincipal objects displays the object ID of the service principal in the App ID property instead of the application ID.

Are you intending to fix this bug?

Yes

Component(s) Affected:

• API

Steps to Reproduce:

Ingest an azurehound payload for an Entra ID tenant with a service principal (e.g., specterdev), search for a service principal in the Explore tab, and click a service principal node. Note that the object ID and app ID are the same and that the app ID does not reflect the application ID noted in Entra ID.

Expected Behavior:

The application ID should be displayed in the app ID property of the service principal node entity panel.

Actual Behavior:

The object ID is displayed in the app ID property of the service principal node entity panel instead of the application ID.

Environment Information:

BloodHound: 8.1.0

Collector: AzureHound 2.4.1

OS: Windows 11

Additional Information:

https://specterops.atlassian.net/browse/BED-6431

Potential Solution (optional):

The issue is that the FetchServicePrincipalApplications function called by getServicePrincipalAppID function (https://github.com/SpecterOps/BloodHound/blob/main/packages/go/analysis/azure/service_principal.go#L58 ) gets the end node (the service principal) instead of the application (the end node) on this line: https://github.com/SpecterOps/BloodHound/blob/0c823b12f27b29aa36df0342a49769e20a107e99/packages/go/analysis/azure/queries.go#L567

Changing FetchEndNodes to FetchStartNodes resolves the issue.

Contributor Checklist:

• [X] I have searched the issue tracker to ensure this bug hasn't been reported before or is not already being addressed.
• [X] I have provided clear steps to reproduce the issue.
• [X] I have included relevant environment information details.