Summary
SmileCDR HAPI FHIR can allow an untrusted bundle to replace a partition identity that was previously established by a trusted source. When partition entitlement checks are not enforced, an attacker authorized for one tenant may read or modify data belonging to another tenant.
SmileCDR HAPI FHIR can allow an untrusted bundle to replace a partition identity that was previously established by a trusted source. When partition entitlement checks are not enforced, an attacker authorized for one tenant may read or modify data belonging to another tenant.
Affected context
The issue occurs in multi-tenant SmileCDR HAPI FHIR deployments that use partition identities to separate tenant data. Risk increases when request or bundle processing permits untrusted partition information to override trusted context and storage partition entitlement enforcement is not enabled by default.
The issue occurs in multi-tenant SmileCDR HAPI FHIR deployments that use partition identities to separate tenant data. Risk increases when request or bundle processing permits untrusted partition information to override trusted context and storage partition entitlement enforcement is not enabled by default.
Exploit preconditions
- Attack surface: HAPI FHIR request and bundle-processing paths that resolve storage partitions
- Required access: Authorization for at least one tenant or partition
- Trigger point: Processing a bundle whose partition identity influences subsequent storage or retrieval operations
- Why exploitation is possible: Untrusted partition information can replace trusted identity context, while entitlement checks may not prevent access to the selected partition
- Attack surface: HAPI FHIR request and bundle-processing paths that resolve storage partitions
- Required access: Authorization for at least one tenant or partition
- Trigger point: Processing a bundle whose partition identity influences subsequent storage or retrieval operations
- Why exploitation is possible: Untrusted partition information can replace trusted identity context, while entitlement checks may not prevent access to the selected partition
Why this happens
The underlying bug is an authorization-context integrity failure. The application allows partition identity supplied through an untrusted bundle to override identity established by a trusted source, and it does not consistently verify that the caller is entitled to the resulting storage partition. This maps to CWE-863: Incorrect Authorization, because access decisions may be made using attacker-influenced context rather than independently validated tenant permissions.
The underlying bug is an authorization-context integrity failure. The application allows partition identity supplied through an untrusted bundle to override identity established by a trusted source, and it does not consistently verify that the caller is entitled to the resulting storage partition. This maps to CWE-863: Incorrect Authorization, because access decisions may be made using attacker-influenced context rather than independently validated tenant permissions.
Potential impact
- An attacker may read records from another tenant's partition
- An attacker could create, modify, or delete data in another tenant's partition
- Cross-tenant confidentiality and integrity boundaries may be weakened
- Unauthorized changes could affect clinical workflows, reporting, or downstream integrations
- The incident may require investigation across multiple tenant environments
- An attacker may read records from another tenant's partition
- An attacker could create, modify, or delete data in another tenant's partition
- Cross-tenant confidentiality and integrity boundaries may be weakened
- Unauthorized changes could affect clinical workflows, reporting, or downstream integrations
- The incident may require investigation across multiple tenant environments
General mitigation guidance
Mitigation generally focuses on preserving trusted authorization context and enforcing tenant entitlement at every storage boundary.
Common defensive patterns include:
- Treating partition identity from untrusted bundles as advisory data rather than an authorization decision
- Binding each operation to a trusted, authenticated tenant context
- Enforcing partition entitlement checks by default before reads and writes
- Applying authorization checks consistently to individual resources and transaction bundles
- Preventing callers from selecting arbitrary partitions through request-controlled values
- Using least-privilege service identities and minimizing cross-tenant administrative capabilities
- Recording partition-selection and authorization decisions for audit and anomaly detection
Mitigation generally focuses on preserving trusted authorization context and enforcing tenant entitlement at every storage boundary.
Common defensive patterns include:
- Treating partition identity from untrusted bundles as advisory data rather than an authorization decision
- Binding each operation to a trusted, authenticated tenant context
- Enforcing partition entitlement checks by default before reads and writes
- Applying authorization checks consistently to individual resources and transaction bundles
- Preventing callers from selecting arbitrary partitions through request-controlled values
- Using least-privilege service identities and minimizing cross-tenant administrative capabilities
- Recording partition-selection and authorization decisions for audit and anomaly detection
How teams detect issues like this
Organizations can look for:
- Static analysis and code review findings where request or bundle fields directly determine tenant or partition selection
- Authorization logic that trusts mutable resource metadata without comparing it to authenticated tenant context
- Missing entitlement checks on repository, persistence, or transaction-bundle operations
- Integration tests that attempt cross-tenant reads and writes using valid credentials from a different tenant
- Policy enforcement requiring explicit tenant-bound authorization before storage access
- Audit events showing partition changes, mismatched tenant identifiers, or access to partitions outside the caller's normal scope
Automated security testing and authorization-focused review tools can help identify inconsistent enforcement across request paths.
Organizations can look for:
- Static analysis and code review findings where request or bundle fields directly determine tenant or partition selection
- Authorization logic that trusts mutable resource metadata without comparing it to authenticated tenant context
- Missing entitlement checks on repository, persistence, or transaction-bundle operations
- Integration tests that attempt cross-tenant reads and writes using valid credentials from a different tenant
- Policy enforcement requiring explicit tenant-bound authorization before storage access
- Audit events showing partition changes, mismatched tenant identifiers, or access to partitions outside the caller's normal scope
Automated security testing and authorization-focused review tools can help identify inconsistent enforcement across request paths.
Sources
| Source | Link |
|---|---|
| abhinavagarwal07. | abhinavagarwal07.github.io/ |
| raw. | raw.githubusercontent.com/ |
| cve. | cve.org/ |
