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Mitigation Strategies Analysis for juliangarnier/anime

Mitigation Strategy: Strict Input Sanitization and Validation (for anime.js parameters)

Description:

  1. Identify anime.js Input Points: Pinpoint every instance where user-supplied data is passed directly into anime.js function calls, specifically targeting animation parameters.
  2. Implement DOMPurify for anime.js: Before any user input reaches anime.js, sanitize it using DOMPurify. Configure DOMPurify with an extremely restrictive whitelist, allowing only the absolute minimum HTML elements and attributes needed for your animations. Disallow <script>, <iframe>, event handlers (like onclick), and ideally, inline styles.
  3. Type Validation for anime.js Parameters: Before sanitization, rigorously validate the data type of each anime.js parameter. If duration is expected, ensure it's a number and within a defined range. If a color is expected, validate it against a color format regex.
  4. Whitelist Values for anime.js: For anime.js parameters with a limited set of valid options (like easing), create a whitelist of allowed values (e.g., 'linear', 'easeInQuad', etc.) and reject any input that doesn't match.
  5. Sanitize Immediately Before anime.js Call: The crucial step: sanitize user input immediately before it's passed to the anime.js function. Do not sanitize earlier and store the result; sanitize right at the point of use.

  • Threats Mitigated:

    • Cross-Site Scripting (XSS) via anime.js: (Severity: High) - Prevents malicious JavaScript from being injected through anime.js parameters that modify the DOM.
    • DOM Clobbering (indirectly via anime.js): (Severity: Medium) - Reduces the risk of attackers manipulating the DOM structure through anime.js.

  • Impact:

    • XSS: Reduces XSS risk related to anime.js to near zero if implemented correctly.
    • DOM Clobbering: Provides significant protection against DOM clobbering attacks that leverage anime.js.

  • Currently Implemented:

    • Partially implemented in ProductDetails component. DOMPurify is used, but the configuration allows <style> tags. Type validation is missing.

  • Missing Implementation:

    • UserComments component: No sanitization of anime.js parameters.
    • HomePageCarousel component: Uses an insufficient regex for sanitization.
    • Type validation is missing in most components using anime.js.
    • Whitelist validation for anime.js easing functions is not implemented.

Mitigation Strategy: Use Safer anime.js Animation Targets

Description:

  1. Prioritize CSS Properties with anime.js: Within your anime.js configurations, always prefer animating CSS properties (e.g., transform, opacity, width, height) over directly manipulating DOM content or attributes.
  2. Avoid innerHTML with anime.js: Never use user-supplied data to directly set the innerHTML property of an element within an anime.js animation.
  3. Use textContent and anime.js's update Callback: If you must animate text content derived from user input, leverage anime.js's update callback function. Inside this callback:
    • Sanitize the user input (using DOMPurify).
    • Set the element's textContent property (which automatically escapes HTML) with the sanitized input. Do not use innerHTML.
  4. Attribute Animations (Extremely Cautious): If animating attributes is unavoidable, be extremely cautious. Sanitize attribute values rigorously. Prefer data-* attributes over style or event handler attributes.

  • Threats Mitigated:

    • Cross-Site Scripting (XSS) via anime.js: (Severity: High) - Reduces the attack surface for XSS by limiting how user input interacts with the DOM through anime.js.

  • Impact:

    • XSS: Significantly reduces XSS risk when combined with input sanitization, specifically within the context of anime.js animations.

  • Currently Implemented:

    • Mostly implemented in ProductImageGallery component (primarily uses CSS transforms with anime.js).

  • Missing Implementation:

    • AnimatedBanner component: Directly sets innerHTML based on user input within an anime.js animation.
    • NotificationSystem component: Animates the style attribute directly with anime.js, using user-configurable colors (without proper validation).

Mitigation Strategy: Limit anime.js Animation Complexity

Description:

  1. Maximum Elements (for anime.js calls): Set a reasonable limit on the number of DOM elements that can be animated simultaneously in a single anime.js call triggered by user input.
  2. anime.js Duration and Delay Limits: Impose maximum values for the duration and delay properties within anime.js configurations. Prevent extremely long or infinite animations initiated by user input.
  3. anime.js Easing Restrictions: Limit the complexity of easing functions used in anime.js. Avoid allowing users to define custom easing functions. Use a whitelist of predefined anime.js easing functions.
  4. anime.js Iteration Limits: Restrict the number of iterations an anime.js animation can run, especially if triggered by user input. Prevent infinite loops.
  5. Value Range Validation for anime.js: For numerical anime.js parameters (e.g., translateX, scale), validate that user-provided values fall within a safe and reasonable range.

  • Threats Mitigated:

    • Denial of Service (DoS) via anime.js: (Severity: Medium) - Prevents attackers from overwhelming the browser with computationally expensive anime.js animations.

  • Impact:

    • DoS: Significantly reduces the risk of client-side DoS attacks specifically targeting anime.js.

  • Currently Implemented:

    • A basic duration limit is implemented globally for anime.js, but it's too high (10 seconds).

  • Missing Implementation:

    • No limits on the number of elements animated by a single anime.js call.
    • No restrictions on anime.js easing functions.
    • No limits on anime.js animation iterations.
    • No value range validation for most numerical anime.js parameters.