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Microsoft Azure Health Bot Server-Side Request Forgery (FHIR Endpoint Validation)

High
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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 allows access to sensitive endpoints internal to the healthbot service itself.

 

The validator mechanism for FHIR Data Connection endpoints used within Azure Health Bot improperly handled redirect responses from user-supplied endpoints. This allowed researchers access to service internals, such as Azure’s WireServer and components of the internal AKS infrastructure.

 

MSRC has assigned this issue a severity rating of Important - 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

July 9, 2024 - Tenable discloses via MSRC portal.
July 9, 2024 - Automated acknowledgement from MSRC.
July 10, 2024 - MSRC assigns case number.
July 12, 2024 - Tenable notices fix applied in their instance of the service, provides MSRC with advisory draft, and requests further information.
July 15, 2024 - MSRC states that they'll provide additional information throughout the coming week. Tenable acknowledges.
July 17, 2024 - MSRC confirms fixes are in place, but states that additional testing and investigations are underway. Tenable requests further information.
July 23, 2024 - Tenable reiterates request. MSRC requests clarifications and a delay in disclosure. Tenable provides clarifications and requests a reason for delaying disclosure.
July 25, 2024 - MSRC provides explanation for delay. Tenable agrees to delay and suggests a new target date.
July 26, 2024 - MSRC agrees to suggested date - August 13, 2024.
August 5, 2024 - MSRC provides severity assessment (Moderate). Tenable disputes assessment.
August 6, 2024 - MSRC acknowledges.
August 8, 2024 - MSRC reconsiders and upgrades severity assessment (Important).
August 9, 2024 - MSRC requests information regarding publications.
August 10, 2024 - Tenable acknowledges severity assessment and provides requested information.

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

Tenable Advisory ID: TRA-2024-28
Credit:
Jimi Sebree
Affected Products:
Affected Products: Azure Health Bot Service prior to July 12, 2024
Risk Factor:
High

Advisory Timeline

August 13, 2024 - Initial release.
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