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Attack Surface Analysis for airbnb/lottie-android

Attack Surface: Maliciously Crafted Animation JSON (Denial of Service)

  • Attack Surface: Maliciously Crafted Animation JSON (Denial of Service)

    • Description: An attacker provides a Lottie JSON file designed to consume excessive resources during parsing or rendering.
    • How lottie-android Contributes: The library is responsible for parsing and rendering the JSON, making it the direct target of this attack.
    • Example: A JSON file with millions of nested layers, extremely large numeric values for dimensions, or an excessive number of keyframes. A "billion laughs" style attack adapted for Lottie's structure.
    • Impact: Application crash (out-of-memory, stack overflow), device freeze, excessive battery drain.
    • Risk Severity: High
    • Mitigation Strategies:
      • Input Validation: Implement strict size limits on the JSON file size, number of layers, number of keyframes, and complexity of shapes/paths.
      • Resource Limits: Set reasonable limits on memory allocation and CPU usage during animation processing. Consider using a timeout for animation loading/rendering.
      • Schema Validation: Validate the JSON structure against a predefined, restrictive schema.
      • Progressive Loading (if applicable): If possible, load and render the animation in stages, checking for resource consumption at each stage.

Attack Surface: Vulnerabilities in lottie-android or its Dependencies

  • Attack Surface: Vulnerabilities in lottie-android or its Dependencies

    • Description: Exploitable bugs or vulnerabilities in the lottie-android library itself or in one of its dependencies.
    • How lottie-android Contributes: This is a direct vulnerability within the library or its supply chain.
    • Example: A buffer overflow vulnerability in the JSON parsing library used by lottie-android, triggered by a specially crafted JSON file.
    • Impact: Varies widely depending on the vulnerability, potentially ranging from crashes to arbitrary code execution (though less likely in a managed environment).
    • Risk Severity: High (potentially Critical, depending on the specific vulnerability)
    • Mitigation Strategies:
      • Regular Updates: Keep lottie-android and all its dependencies updated to the latest versions.
      • Dependency Monitoring: Use software composition analysis (SCA) tools to monitor dependencies for known vulnerabilities.
      • Vulnerability Scanning: Regularly scan the application and its dependencies for known vulnerabilities.
      • Use a Specific Version: Pin the version of lottie-android to a known, secure version, and avoid using "latest" or wildcard versions.