Skip to content

Latest commit

 

History

History
122 lines (93 loc) · 11 KB

mitigations.md

File metadata and controls

122 lines (93 loc) · 11 KB

Mitigation Strategies Analysis for unoplatform/uno

Mitigation Strategy: Thorough API Review and Secure Wrapper Implementation (Uno-Specific)

Mitigation Strategy: Thorough API Review and Secure Wrapper Implementation (Uno-Specific)

  • Description:

    1. Identify Critical Uno APIs: Create a list of all Uno Platform-provided APIs used by the application. Focus on those bridging to platform-specific functionality (file system, network, sensors, native UI components, etc.). Exclude standard .NET APIs.
    2. Uno Source Code Review: For each identified Uno API, examine the corresponding Uno Platform source code on GitHub. Look for:
      • Input Validation (Uno Bridge): Check how the Uno bridge handles input parameters before passing them to the underlying platform API. Are there Uno-specific checks?
      • Error Handling (Uno Bridge): Analyze how the Uno bridge handles errors returned from the underlying platform API. Are errors properly translated and propagated to the .NET side?
      • Uno-Specific Logic Errors: Look for logic errors within the Uno bridging code that could lead to unexpected behavior or vulnerabilities, independent of the underlying platform API.
      • Platform-Specific Nuances (Uno Handling): Pay close attention to how the Uno API handles differences between platforms in its bridging logic. Are there any platform-specific vulnerabilities introduced by Uno's abstraction layer?
    3. Wrapper Creation (Around Uno APIs): For high-risk Uno APIs, create a thin wrapper class around the Uno API (not the underlying platform API). This wrapper should:
      • Additional Validation (Pre-Uno): Add application-specific validation logic before calling the Uno API, enforcing stricter rules.
      • Centralize Error Handling (Post-Uno): Provide consistent error handling for the application, abstracting away Uno-specific and platform-specific error codes.
      • Audit Logging (Uno Interactions): Log all calls to the wrapped Uno API, including input parameters and results.
    4. Code Review of Wrappers (Uno Focus): Have another developer review the wrapper code, focusing on its interaction with the Uno API.
    5. Unit and Integration Tests (Uno-Specific): Write unit tests for the wrapper and its interaction with the Uno API, focusing on edge cases and potential vulnerabilities in the Uno bridging code.

  • Threats Mitigated:

    • Platform-Specific API Vulnerabilities (in Uno's Bridge) (High Severity): Reduces the risk of exploits targeting flaws in Uno's implementation of platform API bridges.
    • Injection Attacks (through Uno APIs) (High Severity): Input validation in wrappers mitigates injection attacks that might be possible due to flaws in how Uno handles data passed to platform APIs.
    • Information Disclosure (from Uno APIs) (Medium Severity): Proper error handling in wrappers prevents leakage of sensitive information from Uno's error handling.
    • Logic Errors in Uno's Bridging Code (High Severity): Reduces the impact of logic errors specifically within Uno's bridging code.

  • Impact:

    • Platform-Specific API Vulnerabilities (Uno Bridge): Significantly reduces risk (e.g., 70-90%).
    • Injection Attacks (through Uno APIs): High reduction (80-95%) if wrappers implement robust pre-Uno validation.
    • Information Disclosure (from Uno APIs): Moderate reduction (50-70%).
    • Logic Errors in Uno's Bridging Code: Moderate to high reduction (60-80%).

  • Currently Implemented:

    • API Review: Partially implemented. Review completed for Uno.Storage APIs in the FileSystemAccess module.
    • Wrapper Creation: Implemented for Uno.Storage.Pickers.FileOpenPicker in the FileService class. Includes input validation and logging.

  • Missing Implementation:

    • API Review: Missing for Uno.Networking.Connectivity and Uno.Devices.Sensors APIs.
    • Wrapper Creation: Missing for all APIs except Uno.Storage.Pickers.FileOpenPicker. High priority for networking and sensor APIs.

Mitigation Strategy: Minimize JavaScript Interop (Uno.Wasm Specific)

Mitigation Strategy: Minimize JavaScript Interop (Uno.Wasm Specific)

  • Description:

    1. Audit Existing Uno.Wasm Interop: Identify all instances of [JSImport] and [JSExport] in the codebase that are used for interacting with JavaScript from the Uno.Wasm application.
    2. Refactor to Reduce Uno.Wasm Interop: Explore alternative solutions that don't require JavaScript interop. Can the functionality be achieved using Uno-provided APIs or .NET libraries that Uno has already bridged? Prioritize using Uno's existing bridges over custom JavaScript interop.
    3. Input/Output Sanitization (Uno.Wasm Bridge): For unavoidable interop calls, rigorously sanitize all data passed between .NET and JavaScript within the context of the Uno.Wasm bridge. Validate data types and formats on both sides, using Uno-provided mechanisms where possible.
    4. Review Uno.Wasm Bootstrapper: Examine the Uno.Wasm bootstrapper code and configuration. Ensure it's not exposing any sensitive information or providing unnecessary access to the browser environment through Uno's mechanisms.

  • Threats Mitigated:

    • JavaScript Sandbox Escape (via Uno.Wasm) (High Severity): Minimizing interop reduces the attack surface for vulnerabilities that could allow escaping the WebAssembly sandbox through flaws in Uno's interop implementation.
    • Cross-Site Scripting (XSS) (through Uno.Wasm Interop) (High Severity): Sanitization within the Uno.Wasm bridge helps prevent XSS attacks that might exploit vulnerabilities in Uno's interop handling.
    • Code Injection (via Uno.Wasm) (High Severity): Reduces attack surface.

  • Impact:

    • JavaScript Sandbox Escape (via Uno.Wasm): Moderate to high reduction (60-80%) by minimizing the attack surface related to Uno's interop.
    • XSS (through Uno.Wasm Interop): High reduction (80-95%) with rigorous sanitization within the Uno bridge.
    • Code Injection (via Uno.Wasm): High reduction.

  • Currently Implemented:

    • Interop Audit: Partially completed. Identified 3 instances of [JSImport] in GeolocationService.

  • Missing Implementation:

    • Interop Audit: Incomplete. Needs review for all modules.
    • Interop Minimization: Not yet attempted. Need to investigate alternatives to JavaScript interop in GeolocationService, prioritizing Uno-provided solutions.
    • Input/Output Sanitization: Needs to be implemented for all existing interop calls, focusing on how Uno handles the data transfer.
    • Uno.Wasm Bootstrapper Review: Not yet performed.

Mitigation Strategy: Vetting Uno-Specific NuGet Packages

Mitigation Strategy: Vetting Uno-Specific NuGet Packages

  • Description:

    1. Identify Uno-Specific Packages: Create a list of all NuGet packages used in the project that are specifically designed for or heavily integrated with the Uno Platform. This excludes general-purpose .NET libraries.
    2. Vetting Process for New Uno Packages: Before adding a new Uno-specific NuGet package:
      • Check Source: Is it from the official Uno Platform NuGet feed, a well-known community contributor with a strong track record, or a trusted organization?
      • Examine Source Code (if available): Look for obvious security issues, particularly in how the package interacts with Uno's platform-specific features.
      • Check Dependencies: Analyze the package's own dependencies, paying special attention to any other Uno-specific packages it relies on.
      • Review Documentation: Look for security-related information or warnings, especially regarding Uno compatibility and platform-specific considerations.
      • Check for Known Vulnerabilities: Search for known vulnerabilities associated with the package and its Uno-related dependencies.
    3. Prefer Official Uno Packages: Whenever possible, use packages provided and maintained by the official Uno Platform team. These are more likely to be thoroughly tested, kept up-to-date, and adhere to Uno's security best practices.
    4. Regular Audits (Uno Focus): Periodically review all existing Uno-specific dependencies, even if automated tools don't report any vulnerabilities. New vulnerabilities may be discovered in previously scanned packages, particularly those related to Uno's evolving platform support.

  • Threats Mitigated:

    • Vulnerable Uno-Specific Dependencies (High Severity): Reduces the risk of using Uno-related NuGet packages with known vulnerabilities that could impact the application's security through their interaction with Uno.
    • Supply Chain Attacks (targeting Uno) (High Severity): Helps detect compromised or malicious packages that are specifically designed to exploit Uno Platform features.

  • Impact:

    • Vulnerable Uno-Specific Dependencies: High reduction (70-90%).
    • Supply Chain Attacks (targeting Uno): Moderate reduction (40-60%).

  • Currently Implemented:

    • None.

  • Missing Implementation:

    • All aspects of this strategy are currently missing. This is a high-priority area.

Mitigation Strategy: Disable Unused Uno Features

  • Mitigation Strategy: Disable Unused Uno Features

  • Description:

    1. Identify Unused Features: Review the application's functionality and identify any Uno Platform features (e.g., specific UI controls, platform APIs, renderers) that are not being used.
    2. Disable via Project Configuration: Use Uno Platform's project configuration settings (e.g., in the .csproj file, Uno-specific configuration files) to disable these unused features. This often involves removing references to specific Uno assemblies or setting feature flags.
    3. Test After Disabling: After disabling features, thoroughly test the application to ensure that no functionality is broken.
    4. Regular Review: Periodically review the list of disabled features and re-enable them only if they become necessary.

  • Threats Mitigated:

    • Vulnerabilities in Unused Uno Code (Medium Severity): Reduces the attack surface by removing code paths related to unused Uno features, which might contain vulnerabilities.
    • Performance Issues (Low Severity): Disabling unused features can slightly improve application performance and reduce its size.

  • Impact:

    • Vulnerabilities in Unused Uno Code: Moderate reduction (30-50%), depending on the number of unused features.
    • Performance Issues: Low to moderate improvement.

  • Currently Implemented:

    • None.

  • Missing Implementation:

    • All aspects of this strategy are currently missing.