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android_webview_app_defined_websites.md

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Android WebView App-Defined Websites

This page analyzes the security of app-defined websites in the Android WebView.

Component Focus

android_webview/browser/aw_app_defined_websites.cc and related files.

Potential Logic Flaws

  • The file retrieves domains from the Android manifest, which could be manipulated by a malicious app.
  • The file caches the domains, which could lead to stale data if the manifest changes.
  • The file loads includes from asset statements, which could be vulnerable to network attacks.
  • The file uses JNI calls, which could be vulnerable to JNI-related issues.

Further Analysis and Potential Issues

  • The GetAppDefinedDomainsFromManifest function retrieves domains from the Android manifest using JNI calls. This function should be carefully analyzed for potential vulnerabilities.
  • The GetAssetStatmentsWithIncludes function loads includes from asset statements. This function should be carefully analyzed for potential vulnerabilities, such as network attacks or malicious content.
  • The AppDefinedWebsites class caches the domains. This cache should be carefully analyzed for potential vulnerabilities, such as stale data or cache poisoning.
  • The file uses base::ThreadPool to perform tasks in the background. This should be analyzed for potential race conditions or other threading issues.
  • The file uses base::BarrierCallback to synchronize multiple tasks. This should be analyzed for potential issues with the barrier callback.

Areas Requiring Further Investigation

  • How are the domains used by the WebView?
  • What are the security implications of a malicious app manipulating the Android manifest?
  • What are the security implications of a malicious server providing malicious asset statements?
  • How does the WebView handle errors when loading asset statements?
  • How does the WebView handle changes to the Android manifest?

Secure Contexts and Android WebView App-Defined Websites

  • How do secure contexts interact with app-defined websites?
  • Are there any vulnerabilities related to secure contexts and app-defined websites?

Privacy Implications

  • What are the privacy implications of app-defined websites?
  • Could a malicious app use app-defined websites to track users?

Additional Notes

  • This component is specific to the Android WebView.
  • This component interacts with the Android manifest and asset statements.