Skip to content

Latest commit

 

History

History
65 lines (38 loc) · 7 KB

payments.md

File metadata and controls

65 lines (38 loc) · 7 KB

Payments Component Security Analysis

Component Focus

This document analyzes the security of the Chromium payments component, focusing on payment app management, the payment request sheet UI, the process of crawling for installable payment apps, and Secure Payment Confirmation (SPC). Key files include those previously mentioned, along with secure_payment_confirmation_browsertest.cc. The numerous VRP rewards associated with this component, along with the high payout for secure_payment_confirmation_browsertest.cc, emphasize the need for thorough security analysis.

Potential Logic Flaws

  • Insufficient Input Validation: Input validation vulnerabilities could lead to injection attacks. This applies to the handling of payment request data, the crawling process, and the Secure Payment Confirmation flow, including validation of credential IDs and relying party IDs, as highlighted by the Show_TransactionUX test.
  • Improper Error Handling: Inadequate error handling during payment operations, crawling, or SPC could lead to information leakage or denial-of-service attacks. The IconDownloadFailure test in secure_payment_confirmation_browsertest.cc demonstrates the importance of handling icon download failures gracefully.
  • Race Conditions: Concurrent operations in payment handling, crawling, and SPC could lead to race conditions. The asynchronous nature of certain operations, such as database interactions and webauthn calls, requires careful synchronization.
  • Service Worker Vulnerabilities: Service workers used for payment app management introduce potential vulnerabilities. The crawler's interaction with service workers should be reviewed.
  • Unvalidated Service Worker URLs: Insufficient validation of service worker URLs during installation or crawling could allow malicious service workers.
  • Secure Payment Confirmation Bypass: Vulnerabilities in the SPC implementation could allow unauthorized transactions or data leakage. The tests in secure_payment_confirmation_browsertest.cc cover various scenarios relevant to SPC security.
  • Authenticator Compatibility: The payments component relies on platform authenticators for Secure Payment Confirmation. Compatibility issues or vulnerabilities in these authenticators could impact the security of the payments flow. The Show_NoAuthenticator and CanMakePayment_NoAuthenticator tests highlight the importance of handling cases where a compatible authenticator is not available.

Further Analysis and Potential Issues

Payment App Management, Payment Request Sheet Controller, Installable Payment App Crawler

The payments component includes key files like payment_app_provider_impl.cc, payment_app_installer.cc, payment_app_database.cc, installed_payment_apps_finder_impl.cc, payment_app_info_fetcher.cc, payment_instrument_icon_fetcher.cc, payment_request_sheet_controller.cc, and installable_payment_app_crawler.cc. These files handle core payment app management, data storage, UI presentation, and crawling for installable payment apps. Key areas to investigate include input validation, error handling, race conditions, service worker security, and database security. The payment_request_sheet_controller.cc file requires careful review for XSS vulnerabilities and secure UI handling. The installable_payment_app_crawler.cc file should be thoroughly analyzed for input validation, proper error handling, race conditions, cross-origin resource sharing issues, permission checks, and service worker security.

Secure Payment Confirmation (chrome/browser/payments/secure_payment_confirmation_browsertest.cc)

The secure_payment_confirmation_browsertest.cc file ($10,000 VRP payout) contains browser tests for Secure Payment Confirmation (SPC). Key tests and security considerations include:

  • Show_TransactionUX: This test verifies the transaction UX, credential handling, and interaction with the payment manifest web data service. The handling of credential IDs and relying party IDs is crucial for security and should be thoroughly analyzed for potential spoofing or unauthorized access vulnerabilities.

  • Show_NoMatchingCredential and Show_WrongCredentialRpId: These tests cover scenarios where no matching credentials are found or the relying party ID is incorrect. They should be reviewed to ensure secure handling of these cases and prevent unauthorized transactions.

  • Show_NoAuthenticator and CanMakePayment_NoAuthenticator: These tests address cases where a compatible authenticator is not available. They should be reviewed to ensure proper error handling and a consistent user experience.

  • IconDownloadFailure: This test verifies the handling of icon download failures. It should be reviewed to ensure that failures are handled gracefully and do not introduce vulnerabilities or unexpected behavior.

  • SecurePaymentConfirmationDisabledTest and SecurePaymentConfirmationDisabledByFinchTest: These tests verify the behavior when SPC is disabled. They should be reviewed to ensure that the feature is completely disabled and does not introduce security risks.

  • SecurePaymentConfirmationActivationlessShowTest: These tests verify that only one call to show() is allowed without user activation, which is important for preventing unauthorized use of SPC. The tests ActivationlessShow and ShowAfterActivationlessShow should be carefully analyzed.

Areas Requiring Further Investigation

  • Input Validation: Implement and thoroughly test input validation for all payment-related functions, including those in the crawler and SPC flow.
  • Error Handling: Implement robust error handling in all critical functions.
  • Race Conditions: Identify and mitigate potential race conditions in payment handling, crawling, and SPC.
  • Service Worker Security: Conduct a comprehensive security audit of service worker implementations and their interaction with the payments component.
  • StoragePartitionImpl and ServiceWorkerContextWrapper Interactions: Review these interactions.
  • DevToolsBackgroundServicesContextImpl Logging: Ensure secure logging.
  • SelfDeleteInstaller Class: Analyze this class for vulnerabilities.
  • Database Security: Review payment_app_database.cc for SQL injection vulnerabilities.
  • payment_request_sheet_controller.cc: Review for XSS vulnerabilities and secure UI handling.
  • Installable Payment App Crawler Security: Analyze all crawler functions for security issues.
  • Secure Payment Confirmation Security: Analyze credential and relying party ID handling, icon download failure handling, behavior when SPC is disabled, and restrictions on activationless show.

Secure Contexts and Payments

Privacy Implications

Additional Notes

Files reviewed: content/browser/payments/*, chrome/browser/ui/views/payments/payment_request_sheet_controller.cc, components/payments/content/installable_payment_app_crawler.cc, chrome/browser/payments/secure_payment_confirmation_browsertest.cc.