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Mitigation Strategies Analysis for alvarotrigo/fullpage.js

Mitigation Strategy: Strict Input Validation and Sanitization with DOMPurify (for fullPage.js callbacks and options)

Description:

  1. Identify Input Points: Identify all points where user-supplied data is used within fullPage.js callbacks (e.g., afterLoad, onLeave, afterRender) and options that can accept JavaScript code or influence DOM manipulation.
  2. Implement DOMPurify: Integrate the DOMPurify library.
  3. Sanitize Before Use: Before using any user-supplied data in a fullPage.js callback or option, pass the data through DOMPurify's sanitize() method: let sanitizedInput = DOMPurify.sanitize(userInput);.
  4. Configure DOMPurify: Configure DOMPurify to allow safe HTML tags/attributes needed for your fullPage.js implementation, disallowing dangerous ones. Start restrictively.
  5. Type Validation: Perform strict type validation. If a fullPage.js option expects a number, ensure the input is a number. Use regular expressions for specific string formats.
  6. Encode for Context: If outputting sanitized data within a specific context (e.g., HTML attribute), use appropriate encoding.

  • Threats Mitigated:

    • Cross-Site Scripting (XSS): (Severity: High) - Prevents attackers from injecting malicious JavaScript into fullPage.js callbacks or options.
    • DOM Manipulation Vulnerabilities (related to fullPage.js): (Severity: Medium) - Reduces risk of DOM manipulation through fullPage.js's functionality.

  • Impact:

    • XSS: Risk significantly reduced (nearly eliminated with correct implementation).
    • DOM Manipulation: Risk significantly reduced.

  • Currently Implemented:

    • Example: Implemented in comments.js when displaying user comments within a fullPage.js section's afterLoad callback.

  • Missing Implementation:

    • Example: Missing in profile.js where user profile data is used in the onLeave callback.

Mitigation Strategy: Indirect Callback Handling (within fullPage.js)

Description:

  1. Identify Direct Embeddings: Find all instances where user input is directly embedded within fullPage.js callback function strings or options.
  2. Use Data Attributes: Store sanitized user data in data attributes of the relevant HTML elements (sections, slides) that fullPage.js manages.
  3. Predefined Callbacks: Create predefined, safe callback functions that retrieve data from these data attributes within the fullPage.js context.
  4. Refactor fullPage.js Callbacks: Refactor the fullPage.js configuration to use these predefined callbacks, passing data indirectly via data attributes. This keeps the callback logic itself safe.

  • Threats Mitigated:

    • Cross-Site Scripting (XSS) (via fullPage.js callbacks): (Severity: High) - Reduces XSS risk by avoiding direct embedding of user input in fullPage.js's executable code.

  • Impact:

    • XSS: Risk significantly reduced.

  • Currently Implemented:

    • Example: Partially implemented; used in navigation.js but not in formHandler.js for fullPage.js callbacks.

  • Missing Implementation:

    • Example: Missing in formHandler.js where user input is directly used in fullPage.js's afterLoad callback.

Mitigation Strategy: Limit Animation Complexity and Provide Disable Option (within fullPage.js)

Description:

  1. Review fullPage.js Animations: Review all animations and transitions configured within fullPage.js for excessive complexity.
  2. Simplify Animations: Simplify or optimize animations used by fullPage.js. Consider CSS transitions where appropriate, controlled through fullPage.js options.
  3. Detect Device Capabilities: Use JavaScript to detect device capabilities and adjust fullPage.js's animation settings (e.g., easing, scrollingSpeed) accordingly.
  4. User Setting (linked to fullPage.js): Provide a user setting to disable or reduce animations, and use this setting to modify fullPage.js's configuration (e.g., set animateAnchor to false, increase scrollingSpeed).
  5. Accessibility: Ensure fullPage.js animations don't violate accessibility guidelines.

  • Threats Mitigated:

    • Denial of Service (DoS) (via fullPage.js): (Severity: Low) - Reduces performance issues exploitable for DoS, specifically related to fullPage.js's animations.
    • Accessibility Issues (within fullPage.js): (Severity: Medium) - Improves accessibility.

  • Impact:

    • DoS: Risk reduced.
    • Accessibility: Significantly improved.

  • Currently Implemented:

    • Example: Partially implemented; fullPage.js animations are optimized, but no disable option that directly interacts with fullPage.js settings.

  • Missing Implementation:

    • Example: Missing user option to disable animations that modifies fullPage.js's configuration. Missing device capability detection to adjust fullPage.js settings.

Mitigation Strategy: Validate and Use Predefined Anchor Names (for fullPage.js navigation)

Description:

  1. Avoid User-Defined Anchors: Do not allow users to directly define or modify the anchor names used by fullPage.js for navigation.
  2. Predefined Anchors: Use a predefined, static set of anchor names (e.g., #section1, #section2) hardcoded in your application and used in the fullPage.js configuration.
  3. Validation (if absolutely necessary): If user input must influence anchor names (strongly discouraged), strictly validate the input to ensure it's safe and compatible with fullPage.js.

  • Threats Mitigated:

    • Unexpected Navigation Behavior (within fullPage.js): (Severity: Low) - Prevents manipulation of fullPage.js's navigation.
    • Potential XSS (in combination with other vulnerabilities, via fullPage.js): (Severity: Low) - Reduces a potential attack vector.

  • Impact:

    • Unexpected Navigation: Risk eliminated.
    • Potential XSS: Risk reduced.

  • Currently Implemented:

    • Example: Implemented; using predefined anchor names in the fullPage.js configuration.

  • Missing Implementation:

    • Example: Not applicable (predefined anchors are used with fullPage.js).

Mitigation Strategy: Disable Debugging in Production (specifically fullPage.js options)

Description:

  1. Identify Debugging Options: Review fullPage.js documentation and your application code to identify any fullPage.js-specific debugging options (e.g., verbose logging, developer tools integration).
  2. Configuration: Configure fullPage.js (through its options) to disable these features in the production environment. This might involve setting environment variables or using conditional code.
  3. Testing: Thoroughly test the production configuration to ensure fullPage.js debugging is disabled.

  • Threats Mitigated:

    • Information Disclosure (through fullPage.js): (Severity: Medium) - Prevents exposure of sensitive information via fullPage.js's debugging output.

  • Impact:

    • Information Disclosure: Risk significantly reduced.

  • Currently Implemented:

    • Example: Implemented; fullPage.js debugging options are disabled in production via environment variables that affect the fullPage.js configuration.

  • Missing Implementation:

    • Example: Not applicable (fullPage.js debugging is disabled).