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Bluetooth Logic Issues

Files Reviewed:

  • content/browser/bluetooth/web_bluetooth_service_impl.cc
  • content/browser/bluetooth/web_bluetooth_pairing_manager_impl.cc
  • content/browser/bluetooth/bluetooth_allowed_devices.cc
  • content/browser/bluetooth/bluetooth_adapter_factory_wrapper.cc
  • content/browser/bluetooth/bluetooth_device_scanning_prompt_controller.cc
  • content/browser/permissions/permission_service_impl.cc
  • content/browser/bluetooth/advertisement_client.cc
  • content/browser/bluetooth/bluetooth_allowed_devices_map.cc
  • content/browser/bluetooth/bluetooth_blocklist.cc
  • content/browser/bluetooth/bluetooth_device_chooser_controller.cc
  • chrome/browser/ui/views/bluetooth_device_credentials_view.cc
  • chrome/browser/ui/views/bluetooth_device_pair_confirm_view.cc

Potential Logic Flaws:

  • Unauthorized Device Pairing: A flaw could allow unauthorized device pairing. The PairDevice function in web_bluetooth_pairing_manager_impl.cc should be reviewed.
  • Data Interception: An attacker might intercept Bluetooth data. The communication channels used by the Web Bluetooth service should be reviewed.
  • Insufficient Authorization Checks: The service might not perform sufficient authorization checks. All functions handling access should be reviewed.
  • Improper Input Validation: The service might not properly validate user input. All functions handling user input should be reviewed. The PIN entry and confirmation dialogs require thorough input validation.
  • Resource Exhaustion: The service might not handle resource exhaustion gracefully. Resource management should be reviewed.
  • Race Conditions in Adapter Management: Race conditions could occur in the BluetoothAdapterFactoryWrapper. Careful review of AcquireAdapter and ReleaseAdapter is needed.
  • Vulnerabilities in Scanning Prompt: The bluetooth_device_scanning_prompt_controller.cc file manages the scanning prompt. Improper handling of prompt events or vulnerabilities in the underlying BluetoothDelegate could lead to security issues.
  • Permission Handling Vulnerabilities: The permission_service_impl.cc file handles permissions. Potential vulnerabilities could arise from improper handling of asynchronous operations or insufficient input validation.
  • Device and Service Access: Insufficient authorization checks or validation of device IDs and service UUIDs in web_bluetooth_service_impl.cc could lead to unauthorized access. The RequestDevice, RemoteServerConnect, and RemoteServerGetPrimaryServices functions are key areas for analysis.
  • Characteristic and Descriptor Access: Improper validation of characteristic and descriptor instance IDs or insufficient authorization checks in web_bluetooth_service_impl.cc could lead to unauthorized access. The various RemoteCharacteristic and RemoteDescriptor functions need review.
  • Scanning and Advertisement Handling: Improper handling of scan filters or insufficient validation of client requests in web_bluetooth_service_impl.cc could lead to vulnerabilities. The RequestScanningStart and WatchAdvertisementsForDevice functions are important.
  • Error Handling: Robust error handling is crucial. The use of ReceivedBadMessage is good, but all error conditions should be handled securely.

Further Analysis and Potential Issues (Updated):

The VRP data reveals several high-value bug fixes in the Bluetooth component. A detailed analysis of the following functions and their interactions is crucial:

  • PairDevice function: This function is a primary target for attackers. Thorough review of authorization checks, input validation, and error handling is essential. A detailed review reveals potential race conditions, minimal error handling, and insufficient input validation.
  • Data Transmission Functions (OnCharacteristicReadValue, etc.): These functions handle data transmission and should be reviewed for vulnerabilities related to data interception and manipulation.
  • Allowed Devices Management (AddDevice, RemoveDevice, GenerateUniqueDeviceId): These functions manage the list of allowed devices. Input validation and protection against unauthorized modifications are critical.
  • Adapter Management (AcquireAdapter, ReleaseAdapter, SetBluetoothAdapterOverride): These functions manage adapter resources. Careful synchronization is needed.
  • OnBluetoothScanningPromptEvent: This function handles scanning prompt events. Thorough review is needed to ensure secure handling and prevent manipulation.
  • GetPermissionStatus, ResetPermissionStatus: These functions are critical for permission management and should be reviewed for potential flaws.
  • WebBluetoothServiceImpl Security: The WebBluetoothServiceImpl class in web_bluetooth_service_impl.cc is responsible for handling Web Bluetooth functionality. Its interactions with the Bluetooth adapter, devices, services, characteristics, and descriptors, as well as its handling of scanning, advertisements, and permissions, require thorough security analysis.

Areas Requiring Further Investigation (Updated):

  • Thoroughly analyze asynchronous operations for potential race conditions and improper error handling.
  • Review error handling mechanisms to prevent information leakage.
  • Implement robust input validation to prevent various attacks.
  • Implement brute-force protection mechanisms.
  • Review the confirmation dialog for sufficient information and security.
  • Analyze the interaction between bluetooth_device_scanning_prompt_controller.cc and the BluetoothDelegate.
  • Review filtering logic for potential vulnerabilities.
  • Fenced Frame Bypass: While the code currently rejects requests from fenced frames, further testing and analysis are needed to ensure that there are no bypasses or edge cases that could allow fenced frames to access Bluetooth functionality.
  • Permissions Policy Enforcement: The enforcement of Bluetooth permissions through Permissions Policy needs to be thoroughly tested to ensure that malicious websites cannot bypass restrictions.
  • Secure Context Enforcement: The requirement for secure contexts (HTTPS) should be rigorously enforced to prevent unauthorized Bluetooth access from insecure origins.

CVE Analysis and Relevance:

This section will be updated after further research.

Secure Contexts and Bluetooth:

The Web Bluetooth API operates within secure contexts. Vulnerabilities in the implementation of secure contexts or the Web Bluetooth API itself could allow attackers to bypass these restrictions.

Privacy Implications:

The Web Bluetooth API has significant privacy implications. The implementation should be carefully designed to protect user privacy.

Additional Notes:

The NOTIMPLEMENTED functions for passkey handling are a particular concern. Files reviewed: (Previous files - unchanged), content/browser/bluetooth/web_bluetooth_service_impl.cc.