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Microsoft Azure Health Bot Server-Side Request Forgery (Data Connection Endpoints)

Critical
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Synopsis

Tenable Research discovered a privilege escalation issue in the Azure Health Bot service via a server-side request forgery (SSRF). This issue allowed researchers access to the service’s internal metadata service (IMDS) and subsequently granted access tokens allowing for the management of cross-tenant resources.

 

The Data Connector utilities used within Azure Health Bot’s Scenario Editor improperly handled redirect responses from user-supplied endpoints. This allowed researchers access to Azure’s IMDS, which gave management access to the internal Microsoft subscription ID governing resources of customers utilizing the Health Bot service.

 

MSRC has assigned this issue a severity rating of Critical - Elevation of Privilege.

Solution

According to Microsoft, mitigations for this issue have been applied to all affected services. No customer action is required. 

Disclosure Timeline

June 17, 2024 - Tenable discloses via MSRC portal.
June 17, 2024 - Automated acknowledgment from MSRC.
June 17, 2024 - MSRC assigned case agent and case number.
June 22, 2024 - MSRC confirms Tenable's report and states fix is in progress.
June 24, 2024 - Tenable acknowledges, provides advisory draft, and requests permission to continue investigating service.
June 24, 2024 - MSRC acknowledges and requests for research to remain paused.
July 2, 2024 - Tenable requests status update and further information from MSRC.
July 2, 2024 - MSRC provides requested information.
July 6, 2024 - MSRC awards researcher with bug bounty.
July 9, 2024 - Tenable notifies MSRC case agent that our original report has been resolved, but that a new issue was discovered and has been created in a new case per prior guidance.
July 10, 2024 - MSRC acknowledges.
July 23, 2024 - Tenable requests CVE identifier and reminds MSRC of July 30 disclosure date.
July 24 thru August 10, 2024 - Disclosure date for this issue aligned with separate Health Bot case.
August 10, 2024 - Tenable provides advisory draft.

All information within TRA advisories is provided “as is”, without warranty of any kind, including the implied warranties of merchantability and fitness for a particular purpose, and with no guarantee of completeness, accuracy, or timeliness. Individuals and organizations are responsible for assessing the impact of any actual or potential security vulnerability.

Tenable takes product security very seriously. If you believe you have found a vulnerability in one of our products, we ask that you please work with us to quickly resolve it in order to protect customers. Tenable believes in responding quickly to such reports, maintaining communication with researchers, and providing a solution in short order.

For more details on submitting vulnerability information, please see our Vulnerability Reporting Guidelines page.

If you have questions or corrections about this advisory, please email [email protected]

Risk Information

CVE ID: CVE-2024-38109
Tenable Advisory ID: TRA-2024-27
Credit:
Jimi Sebree
Affected Products:
Azure Health Bot Service prior to July 2, 2024
Risk Factor:
Critical

Advisory Timeline

August 13, 2024 - Initial release.
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