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Threat Model Analysis for afollestad/material-dialogs

Threat: Cross-Site Scripting (XSS) via Unsanitized Input

  • Description: An attacker injects malicious JavaScript code into user-supplied data that is then displayed directly within a Material Dialog's content. This happens because the application fails to sanitize or encode user input before passing it to the dialog's title, content, or customView parameters. The library itself does not perform any sanitization; it renders the provided content. The attacker's script executes in the context of other users' browsers.
    • Impact:
      • Theft of user cookies and session tokens.
      • Redirection of users to malicious websites.
      • Defacement of the application's UI (specifically, the dialog).
      • Execution of arbitrary code within the user's browser.
      • Keylogging and data theft.
    • Affected Component:
      • title parameter in various dialog creation functions (e.g., MaterialDialog, show()).
      • content parameter in various dialog creation functions.
      • customView parameter, if user input is directly used to construct the custom view's HTML without proper sanitization.
      • Input fields within a customView (input(), etc.) if their values are directly used in other parts of the dialog or application without sanitization upon submission.
    • Risk Severity: Critical
    • Mitigation Strategies:
      • Input Validation: Strictly validate all user input on the server-side before it's used anywhere, including within dialogs. Define allowed character sets and data types.
      • Output Encoding: Use appropriate output encoding (HTML encoding, JavaScript string escaping) when displaying user-supplied data within the dialog. Use a library like DOMPurify to sanitize HTML content before inserting it into the content parameter. If using a framework like React, leverage JSX's built-in escaping.
      • Content Security Policy (CSP): Implement a strong CSP to limit script sources, mitigating XSS impact even if injection occurs.
      • Avoid customView with Unsanitized Input: Exercise extreme caution with customView and user input. Avoid direct construction of the custom view's HTML from user input. If unavoidable, use a robust sanitization library.

Threat: Unintentional Information Disclosure in Dialogs

  • Description: The application inadvertently displays sensitive information (API keys, session tokens, PII, internal error messages) within a dialog's title, content, or customView. This is a direct result of the application passing sensitive data to these parameters without realizing the security implications. The library displays whatever it's given.
    • Impact:
      • Exposure of sensitive data to unauthorized users.
      • Potential for credential theft or account compromise.
      • Privacy violations.
    • Affected Component:
      • title parameter.
      • content parameter.
      • customView (if it's designed to display data that could be sensitive).
    • Risk Severity: High
    • Mitigation Strategies:
      • Code Review: Thoroughly review all code that creates dialogs, paying close attention to the data passed to title, content, and customView.
      • Data Sanitization (for Error Messages): If displaying error messages, sanitize them to remove sensitive internal details. Display user-friendly messages, not raw technical errors.
      • Testing: Implement automated tests to verify that dialogs do not display sensitive information under various conditions. This is crucial.