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Mitigation Strategies Analysis for moment/moment

Mitigation Strategy: Upgrade and Transition to Alternatives

  • Description:

    1. Identify Current Version: Determine the exact version of moment currently used in the project (package.json, package-lock.json, or yarn.lock).
    2. Upgrade to Latest moment (Temporary): Immediately upgrade to the absolute latest version of moment: npm install moment@latest or yarn add moment@latest. This addresses known, patched vulnerabilities within moment.
    3. Choose a Replacement: Select a replacement library (date-fns, Luxon, Day.js, or the native Intl object).
    4. Phased Replacement: Plan a phased replacement, replacing moment usage module by module, prioritizing those handling user input.
    5. Remove moment: Once all usages are replaced, remove moment from your project's dependencies: npm uninstall moment or yarn remove moment.
    6. Update Documentation: Update any project documentation.

  • Threats Mitigated:

    • ReDoS (CVE-2016-4055 and similar): Severity: High. Upgrading mitigates known ReDoS. Transitioning eliminates this moment-specific risk.
    • Locale-Related Vulnerabilities (Potential): Severity: Medium. Transitioning reduces the attack surface.
    • Prototype Pollution (Indirect): Severity: Medium. Transitioning to an immutable library eliminates the risk of moment's mutability exacerbating this.

  • Impact:

    • ReDoS: Risk reduced from High to Low (upgrade) and then to Negligible (transition).
    • Locale-Related: Risk reduced from Medium to Low.
    • Prototype Pollution: Risk reduced from Medium to Low.

  • Currently Implemented:

    • Check package.json and lock files for the current moment version.
    • Search codebase for moment version checks or migration plans.
    • Example: "Partially implemented. moment is at version 2.29.4. Some components use date-fns."

  • Missing Implementation:

    • Identify modules still using moment (e.g., grep -r "moment(" .).
    • Prioritize modules handling user-supplied dates.
    • Example: "Missing in reporting, event scheduling, and date input validation. No full migration plan."

Mitigation Strategy: Strict Input Validation (Pre-moment)

  • Description:

    1. Identify Input Points: Identify all points where user-supplied data is input to moment functions, especially moment(userInput).
    2. Implement Validation Before moment: Implement strict validation before passing data to moment.
    3. Format Enforcement:
      • Define Expected Formats: Determine the exact date/time formats (e.g., "YYYY-MM-DD").
      • Use Safe Regular Expressions: Use simple, non-moment based regular expressions to enforce formats. Example (YYYY-MM-DD): /^\d{4}-\d{2}-\d{2}$/.
      • Dedicated Validation Library: Consider a dedicated non-moment date/time validation library.
    4. Length Limits: Set reasonable maximum lengths for date/time strings.
    5. Character Whitelisting/Blacklisting: Restrict allowed characters (e.g., only digits and separators for numeric dates).
    6. Reject Invalid Input: Reject invalid input immediately. Do not pass it to moment.
    7. Test Thoroughly: Test with valid and invalid inputs, including boundary cases and potential ReDoS strings.

  • Threats Mitigated:

    • ReDoS (CVE-2016-4055 and similar): Severity: High. Prevents crafted input from reaching moment's parsing logic.
    • Locale-Related Vulnerabilities (Potential): Severity: Medium. Reduces reliance on moment's locale-specific parsing.

  • Impact:

    • ReDoS: Risk reduced from High to Medium (with latest moment) or Low (with an alternative).
    • Locale-Related: Risk reduced from Medium to Low.

  • Currently Implemented:

    • Examine code handling user date/time input.
    • Look for validation before calls to moment.
    • Check for regular expressions, length checks, etc.
    • Example: "Partially implemented. Length checks on date inputs in user registration, but no format validation."

  • Missing Implementation:

    • Identify areas where user-supplied date/time data is used without prior validation.
    • Prioritize where input is directly passed to moment's parsing.
    • Example: "Missing in event creation, reporting date range selector, and API endpoints with date parameters. No consistent validation."

Mitigation Strategy: Controlled Locale Loading

  • Description:

    1. Identify Required Locales: Determine which locales your application needs.
    2. Bundle Locales: Include locale files within your application's codebase. Do not load them dynamically.
    3. Explicitly Load Locales: Explicitly load only required locales: moment.locale('en');. Do not allow users to select locales arbitrarily.
    4. Regular Audits: Periodically review locale files to ensure they haven't been tampered with.

  • Threats Mitigated:

    • Locale-Related Vulnerabilities (Potential): Severity: Medium. Controls which locales are loaded and from where, reducing the risk of malicious files.

  • Impact:

    • Locale-Related: Risk reduced from Medium to Low.

  • Currently Implemented:

    • Check how locales are loaded.
    • Look for moment.locale() calls.
    • See if locale files are bundled or loaded dynamically.
    • Example: "Partially implemented. 'en' and 'fr' are bundled and explicitly loaded."

  • Missing Implementation:

    • Identify instances of dynamic locale loading or user-influenced locale selection.
    • Example: "Missing: User profile settings allow selecting a preferred language, potentially loading arbitrary locales."

Mitigation Strategy: Avoid Mutating moment Objects

  • Description:

    1. Treat moment objects as immutable: Even though some mutation methods exist in moment, always create new instances instead of modifying existing ones.
    2. Use cloning: If you need a copy of a moment object, use the .clone() method to create a new, independent instance. Avoid directly assigning moment objects.
    3. Avoid mutation methods: Do not use methods that modify the moment object in place (e.g., add(), subtract(), startOf(), etc., without reassigning). If you must use them, reassign the result to a new variable: newDate = oldDate.add(1, 'day'); instead of oldDate.add(1, 'day');

  • Threats Mitigated:

    • Prototype Pollution (Indirect): Severity: Medium. Reduces the risk of moment's mutability exacerbating prototype pollution vulnerabilities.

  • Impact:

    • Prototype Pollution: Risk reduced. While this doesn't eliminate prototype pollution risk, it prevents moment from making it worse.

  • Currently Implemented:

    • Review code for any instances where moment objects are modified in place.
    • Look for uses of .clone() and reassignment after using mutation methods.
    • Example: "Partially implemented. Some areas use .clone(), but others directly modify moment objects."

  • Missing Implementation:

    • Identify all instances of in-place modification of moment objects.
    • Refactor code to create new instances instead.
    • Example: "Missing: Widespread use of add() and subtract() without reassignment. Needs comprehensive refactoring."