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Threat Model Analysis for jverkoey/nimbus

Threat: JavaScript Injection in Web Views (Nimbus-Managed)

  • Threat: JavaScript Injection in Web Views (Nimbus-Managed)

    • Description: An attacker crafts malicious JavaScript code and injects it into a web view specifically managed by Nimbus components. This is most likely to occur through a compromised website loaded within the NIWebController, or a custom Nimbus component that improperly handles web content or embeds a UIWebView/WKWebView without sufficient security measures. The attacker leverages the Nimbus component to execute the malicious script.
    • Impact:
      • Theft of user cookies and session tokens, leading to account takeover.
      • Redirection of the user to phishing sites.
      • Modification of the web view's content to display false information.
      • Execution of arbitrary JavaScript code within the application's context (specifically, the context provided by the Nimbus web view), potentially accessing sensitive data or device features exposed to that context.
      • Bypass of application security controls that rely on the web view's integrity.
    • Affected Nimbus Component: NIWebController, any custom Nimbus component that utilizes UIWebView or WKWebView (directly or indirectly and without proper sanitization), or any Nimbus component designed to render HTML content that doesn't properly escape or sanitize input.
    • Risk Severity: Critical
    • Mitigation Strategies:
      • Strict Input Validation & Sanitization: Implement extremely rigorous input validation and sanitization for all data displayed within a Nimbus-managed web view. Use a well-vetted and actively maintained HTML sanitization library (e.g., OWASP's AntiSamy or a robust equivalent). Never trust user-supplied input or data from external sources, even if seemingly benign.
      • Content Security Policy (CSP): Implement a strict Content Security Policy (CSP) within the Nimbus-managed web view. This policy should severely restrict the origins from which scripts, styles, and other resources can be loaded. Configure the WKWebView's configuration.websiteDataStore.httpCookieStore for secure cookie management.
      • Output Encoding: Ensure that all data displayed in the Nimbus-managed web view is properly encoded for its context (HTML encoding, JavaScript encoding, etc.).
      • Avoid Untrusted Content: Strongly prefer not loading untrusted or external web content within the Nimbus-managed web view. If external links are necessary, open them in the system browser (Safari) instead of within the app's Nimbus-controlled web view.
      • Disable JavaScript (If Possible): If JavaScript is not absolutely essential for the Nimbus web view's functionality, disable it entirely. This eliminates the JavaScript injection risk.
      • WKWebView Preference: Always use WKWebView instead of the deprecated UIWebView. WKWebView provides significant security improvements.
      • Nimbus-Specific Delegate Monitoring: Implement the WKNavigationDelegate (for WKWebView) or UIWebViewDelegate (if using the deprecated UIWebView) methods specifically within the Nimbus component to monitor navigation and resource loading. Block or sanitize suspicious requests before they are processed by the web view. This is a crucial Nimbus-specific mitigation.
      • Regular Nimbus & WebKit Updates: Keep both the Nimbus framework and the underlying WebKit engine (through iOS updates) up-to-date to benefit from the latest security patches.

Threat: Data Leakage via Nimbus Network Traffic Interception (Nimbus Networking Components)

  • Threat: Data Leakage via Nimbus Network Traffic Interception (Nimbus Networking Components)

    • Description: An attacker intercepts network traffic specifically generated by Nimbus's networking components. This could involve using a proxy tool or compromising the network. If sensitive data (API keys, user credentials) is transmitted in plain text or with weak encryption by these Nimbus components, the attacker can steal this information. The focus here is on the attacker targeting Nimbus's built-in networking capabilities.
    • Impact:
      • Exposure of API keys used by Nimbus components, leading to unauthorized access to backend services.
      • Theft of user credentials if handled by Nimbus networking components, enabling account takeover.
      • Disclosure of sensitive user data transmitted via Nimbus's networking features.
      • Man-in-the-middle (MITM) attacks, where the attacker modifies network traffic handled by Nimbus to manipulate the application's behavior.
    • Affected Nimbus Component: NINetworkImageView, NINetworkRequestOperation, any custom Nimbus component that directly uses NSURLSession or other networking APIs and integrates with Nimbus's request/response handling. The key is that the vulnerability lies in how Nimbus itself handles the network communication.
    • Risk Severity: High
    • Mitigation Strategies:
      • HTTPS Enforcement: Mandatory use of HTTPS for all network communication performed by Nimbus components. Absolutely no plain HTTP connections should be allowed.
      • Certificate Pinning (Nimbus-Specific): Implement certificate pinning specifically within the Nimbus components that handle network requests. This ensures that the Nimbus component only communicates with servers presenting a pre-validated certificate, preventing MITM attacks. This is a critical Nimbus-focused mitigation.
      • Strong Encryption: Use strong encryption protocols and ciphers (TLS 1.3 or higher) within the Nimbus networking components.
      • Data Minimization (Nimbus Context): Within the Nimbus components, only transmit the absolute minimum necessary data over the network. Avoid sending sensitive information if it's not essential for the Nimbus component's function.
      • Request Validation (Nimbus-Specific): Within the Nimbus components handling network requests, rigorously validate and sanitize all data sent in network requests to prevent injection attacks that could manipulate the request or its parameters before they are sent.
      • Disable Caching of Sensitive Data (Nimbus-Specific): Configure Nimbus's caching mechanisms (and any underlying networking libraries used by Nimbus) to never cache sensitive data handled by the Nimbus components.
      • App Transport Security (ATS): Ensure that App Transport Security (ATS) is properly configured in your app's Info.plist to enforce secure network connections. While this is a general iOS security measure, it's crucial for protecting Nimbus's network communications.

Threat: Debugging Feature Exposure in Production (Nimbus Features)

  • Threat: Debugging Feature Exposure in Production (Nimbus Features)

    • Description: Nimbus-specific debugging features (e.g., network request logging within NINetworkRequestOperation, view hierarchy inspection tools provided by Nimbus) are accidentally left enabled in a production build. An attacker with physical access to the device or a compromised device can access these Nimbus-provided debugging features to extract sensitive information or understand how the application uses Nimbus internally.
    • Impact:
      • Exposure of API keys, user data, and other sensitive information logged by Nimbus's debugging tools.
      • Disclosure of the application's internal structure and logic, specifically related to Nimbus component usage, aiding in vulnerability discovery.
      • Potential for reverse engineering the application's interaction with Nimbus.
    • Affected Nimbus Component: All Nimbus components, but particularly those with built-in debugging capabilities: NINetworkRequestOperation, NINetworkImageView, NIDebuggingTools, NIViewRecycler, NITableViewModel, and any custom Nimbus components that have debugging logic.
    • Risk Severity: High
    • Mitigation Strategies:
      • Conditional Compilation (Nimbus-Specific): Use preprocessor macros (#ifdef DEBUG) to conditionally compile all Nimbus-related debugging code. Ensure that no Nimbus debugging features are enabled in release builds. This is the primary mitigation.
      • Build Configuration Verification: Double-check Xcode build settings to ensure that debugging symbols are stripped and optimizations are enabled for release builds. This helps prevent accidental inclusion of debugging code.
      • Code Review (Nimbus Focus): Conduct regular code reviews with a specific focus on identifying and removing any Nimbus debugging features that might have been accidentally left in production code.
      • Automated Checks (Nimbus-Specific): Implement automated checks (e.g., as part of a CI/CD pipeline) to verify that no Nimbus debugging features are enabled in release builds. This could involve searching for specific Nimbus debugging API calls.