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Threat Model Analysis for scalessec/toast-swift

Threat: Cross-Site Scripting (XSS) via Toast Content

  • Description: An attacker injects malicious JavaScript (or other client-side code) into a field that is later used as input for a toast message. If the toast-swift library fails to properly sanitize this input before rendering it, the injected script will execute within the application's context. The attacker could steal cookies, redirect the user, or deface the application. This threat hinges on a potential lack of input sanitization within toast-swift itself.
    • Impact: Compromise of user accounts, data theft, session hijacking, application defacement, loss of user trust.
    • Affected Component: The ToastView's content rendering logic (e.g., a hypothetical setContent() or updateText() function within the ToastView class, or wherever the text/HTML is being set). Also, any custom view components used within a toast if they handle user input directly and toast-swift doesn't sanitize them.
    • Risk Severity: High (if user input is used in toasts) / Critical (if user input is used and the application handles sensitive data). The severity is high because even if the application developer intends to sanitize, a bug in toast-swift could bypass that.
    • Mitigation Strategies:
      • Primary (Application Developer): Always sanitize and encode all user-provided input before passing it to toast-swift, even if you believe the library handles it. This is defense-in-depth. Use appropriate output encoding (HTML encoding is most likely).
      • Secondary (Application Developer): Implement a Content Security Policy (CSP).
      • Crucial (Library Maintainer - toast-swift): The toast-swift library must internally sanitize any input provided to it before rendering it as HTML or displaying it in a way that could execute script. This sanitization should be robust and well-tested. The library should clearly document its sanitization behavior.
      • Verification (Application Developer): If possible, review the source code of toast-swift to verify the presence and effectiveness of its input sanitization. If unsure, assume it's not safe and sanitize externally.

Threat: Vulnerable Dependency (If Critical/High Vulnerability Exists)

  • Description: A dependency of toast-swift contains a known, critical or high severity vulnerability that can be exploited. This is not a vulnerability in toast-swift code, but a vulnerability in code that toast-swift relies on.
    • Impact: Varies widely depending on the specific vulnerability in the dependency, but could include remote code execution, data breaches, etc. (High/Critical impact by definition).
    • Affected Component: The entire toast-swift library, due to its reliance on the vulnerable dependency.
    • Risk Severity: High or Critical (depending on the dependency's vulnerability).
    • Mitigation Strategies:
      • Immediate (Application Developer & Library Maintainer): Update toast-swift to a version that uses a patched version of the vulnerable dependency. If no such version exists, consider:
        • Temporary Workaround (Application Developer): If possible, temporarily disable the use of toast-swift or the specific feature that relies on the vulnerable dependency.
        • Forking (Library Maintainer): If the dependency is unmaintained, consider forking the dependency and applying the patch directly, then updating toast-swift to use the forked version.
        • Alternative Library (Application Developer): As a last resort, consider switching to a different toast notification library that does not have the vulnerable dependency.
      • Ongoing (Application Developer & Library Maintainer): Use dependency scanning tools and regularly update all dependencies.

Threat: Undiscovered Vulnerability within toast-swift (Potentially High/Critical)

  • Description: toast-swift itself contains an undiscovered vulnerability (e.g., in its rendering logic, event handling, or custom view support) that could allow for code injection, denial of service, or other exploits. This is a hypothetical threat, but a realistic possibility for any software.
    • Impact: Unknown, but potentially High or Critical, depending on the nature of the undiscovered vulnerability.
    • Affected Component: Potentially any part of the toast-swift library.
    • Risk Severity: Unknown, but potentially High or Critical. We include it here because it could be high/critical.
    • Mitigation Strategies:
      • Code Review (Library Maintainer): Conduct regular security-focused code reviews of the toast-swift codebase.
      • Security Testing (Library Maintainer & Application Developer): Perform security testing (e.g., fuzzing, penetration testing) on toast-swift and the application that uses it.
      • Bug Bounty Program (Library Maintainer): Consider establishing a bug bounty program to incentivize security researchers to find and report vulnerabilities.
      • Stay Updated (Application Developer): Keep toast-swift updated to the latest version, as updates often include security fixes.