WebAPI/Security/BrowserAPI

Name of API: Browser API

References:

• https://wiki.mozilla.org/WebAPI/EmbeddedBrowserAPI
• popup windows in b2g: https://bugzilla.mozilla.org/show_bug.cgi?id=716664
• window.open in iframe mozbrowser: https://bugzilla.mozilla.org/show_bug.cgi?id=742944
• window.open in iframe mozapp: https://bugzilla.mozilla.org/show_bug.cgi?id=744451

Brief purpose of API: Provide an iframe that acts as a web browser

General Use Cases: A browser app.

Inherent threats:

• browser can see all data from all websites, and perform all actions
• can steal passwords (user-entered; enumerate all saved passwords)
• can steal cookies (by enumerating websites)
• NOT a use case: OAuth or other app-content or content-content interactions

Threat severity: high per https://wiki.mozilla.org/Security_Severity_Ratings

Regular web content (unauthenticated)

Use cases for unauthenticated code: None

Authorization model for normal content: None

Authorization model for installed content:None

Potential mitigations:

Trusted (authenticated by publisher)

Use cases for authenticated code: Implement a 3rd party browser application

Authorization model: Implicit

Potential mitigations: Each app has separate cookie and password stores from other apps (including system browser app)

Certified (vouched for by trusted 3rd party)

Use cases for certified code: Replacement Browser

Authorization model: Implicit

Potential mitigations: N/A