mitigations.md

Mitigation Strategies Analysis for pixijs/pixi.js

Mitigation Strategy: 1. Regular PixiJS Updates

• Mitigation Strategy: Regularly Update PixiJS Library
• Description:
  1. Monitor PixiJS Releases: Track releases on the official PixiJS GitHub repository (https://github.com/pixijs/pixi.js) and community channels for security updates and bug fixes.
  2. Review PixiJS Changelogs: When updating, specifically review the PixiJS changelogs for mentions of security patches or bug fixes that could impact your application.
  3. Test PixiJS Updates: Before deploying to production, thoroughly test PixiJS updates in a staging environment to ensure compatibility with your application's PixiJS implementation and identify any regressions.
  4. Update PixiJS Dependency: Use your package manager (npm, yarn, etc.) to update the pixi.js dependency to the latest stable version.
  5. Maintain Update Schedule: Establish a regular schedule for checking and applying PixiJS updates to benefit from the latest security improvements.
• List of Threats Mitigated:
  • Exploits of Known PixiJS Vulnerabilities (High Severity): Outdated PixiJS versions may contain known security flaws that attackers can exploit within the PixiJS rendering context.
• Impact:
  • Exploits of Known PixiJS Vulnerabilities (High Reduction): Directly mitigates risks associated with publicly known vulnerabilities in PixiJS itself.
• Currently Implemented:
  • Yes, implemented in the project's CI/CD pipeline with weekly automated dependency checks for pixi.js.
• Missing Implementation:
  • Automated pull request creation for PixiJS updates after staging environment testing is missing for a more proactive update process.

Mitigation Strategy: 2. Vulnerability Scanning for PixiJS Dependencies

• Mitigation Strategy: Implement Vulnerability Scanning for PixiJS and its Dependencies
• Description:
  1. Utilize Dependency Scanning Tools: Employ vulnerability scanning tools (like npm audit, yarn audit, OWASP Dependency-Check, or commercial SCA tools) to analyze pixi.js and its direct and transitive dependencies.
  2. Focus on PixiJS Dependency Tree: Configure the scanning tool to specifically analyze the dependency tree originating from pixi.js in your project's package.json or yarn.lock file.
  3. Prioritize PixiJS Related Vulnerabilities: Review scan results, prioritizing vulnerabilities identified within the PixiJS dependency chain, as these directly impact the security of your PixiJS implementation.
  4. Remediate PixiJS Dependency Issues: Address identified vulnerabilities by updating pixi.js or its vulnerable dependencies to patched versions.
• List of Threats Mitigated:
  • Exploits of Known PixiJS Dependencies Vulnerabilities (High Severity): PixiJS relies on third-party libraries, and vulnerabilities in these dependencies can indirectly affect PixiJS security and your application.
• Impact:
  • Exploits of Known PixiJS Dependencies Vulnerabilities (High Reduction): Proactively identifies and allows remediation of vulnerabilities within the libraries PixiJS relies upon.
• Currently Implemented:
  • Yes, npm audit is integrated into the CI pipeline, scanning pixi.js dependencies on every pull request and nightly build.
• Missing Implementation:
  • Exploring more comprehensive SCA tools beyond npm audit could enhance vulnerability detection within the broader PixiJS dependency ecosystem.

Mitigation Strategy: 3. Content Security Policy (CSP) Configuration for PixiJS

• Mitigation Strategy: Configure Content Security Policy (CSP) to Secure PixiJS Usage
• Description:
  1. Define PixiJS-Specific CSP Directives: When configuring CSP, consider the specific resource loading requirements of PixiJS, particularly for:
     • script-src: Control script sources, ensuring only trusted origins for PixiJS scripts and any plugins. Minimize or eliminate 'unsafe-inline' and 'unsafe-eval' which can weaken CSP and are generally not required for standard PixiJS usage.
     • img-src: Restrict image sources to trusted domains for textures and sprites used by PixiJS.
     • connect-src: If PixiJS or your application loads assets via network requests (e.g., AJAX for textures), configure connect-src to whitelist allowed origins.
  2. Test CSP Compatibility with PixiJS: Thoroughly test your CSP configuration to ensure it doesn't interfere with PixiJS functionality, especially WebGL rendering or plugin loading.
  3. Monitor PixiJS CSP Violations: Set up CSP violation reporting to detect any unexpected resource loading attempts by PixiJS or your application within the PixiJS context.
• List of Threats Mitigated:
  • Cross-Site Scripting (XSS) impacting PixiJS Context (High Severity): CSP can prevent execution of malicious scripts that might attempt to manipulate PixiJS or access data within the PixiJS rendering environment.
• Impact:
  • Cross-Site Scripting (XSS) impacting PixiJS Context (High Reduction): Significantly reduces the risk of XSS attacks that could compromise the PixiJS rendering and application logic.
• Currently Implemented:
  • Partially implemented. A basic CSP exists, but needs refinement for PixiJS specific needs and stricter directives.
• Missing Implementation:
  • CSP needs to be tightened by removing 'unsafe-inline' and 'unsafe-eval', explicitly configuring connect-src and style-src for PixiJS resources, and setting up CSP violation reporting to monitor PixiJS related policy breaches.

Mitigation Strategy: 4. Sanitize User-Provided Text for PixiJS Text Rendering

• Mitigation Strategy: Sanitize User-Provided Text Before Rendering with PixiJS Text Objects
• Description:
  1. Identify PixiJS Text Input Points: Locate all instances where user-provided text is used to set the text property of PixiJS Text objects or similar text rendering functionalities within PixiJS.
  2. Sanitize Before PixiJS Rendering: Apply HTML sanitization to user-provided text before passing it to PixiJS for rendering. Use a JavaScript sanitization library (e.g., DOMPurify) to remove or encode potentially malicious HTML or JavaScript code.
  3. Focus on Text Content: Ensure sanitization is applied specifically to the text content that will be rendered by PixiJS, preventing interpretation of malicious code within the PixiJS text rendering process.
• List of Threats Mitigated:
  • Cross-Site Scripting (XSS) via PixiJS Text Rendering (High Severity): Unsanitized user text rendered by PixiJS Text objects could be exploited to inject and execute malicious JavaScript within the application context.
• Impact:
  • Cross-Site Scripting (XSS) via PixiJS Text Rendering (High Reduction): Effectively prevents XSS attacks originating from user-controlled text displayed using PixiJS text rendering features.
• Currently Implemented:
  • No, user-provided text is currently directly used in PixiJS Text objects in some application areas without sanitization.
• Missing Implementation:
  • Sanitization must be implemented for all user text inputs used in PixiJS Text rendering across the application, especially in user-generated content areas.

Mitigation Strategy: 5. Validate User-Provided Image URLs and Assets for PixiJS Textures

• Mitigation Strategy: Validate User-Provided Image URLs and Assets Used as PixiJS Textures
• Description:
  1. Identify PixiJS Texture Input Points: Pinpoint areas where users can provide image URLs or upload image files that are subsequently used as textures for PixiJS sprites or other display objects.
  2. Validate Image Sources for PixiJS: Implement validation specifically for image sources intended for PixiJS textures:
     • URL Validation (if applicable): If users provide URLs, validate URL format and ideally whitelist allowed domains for PixiJS texture sources.
     • File Type and Content Validation (for uploads): For file uploads used as PixiJS textures, validate file type and content on the server-side to ensure they are valid and safe image formats before being used by PixiJS.
  3. Secure Texture Handling for PixiJS: Ensure that PixiJS texture loading and handling processes are secure, preventing the use of malicious or unexpected file types as textures.
• List of Threats Mitigated:
  • Cross-Site Scripting (XSS) via Malicious PixiJS Textures (Medium Severity): While less common, malicious image files used as PixiJS textures could potentially exploit image processing vulnerabilities or contain embedded scripts.
  • Denial of Service (DoS) via Large or Malformed PixiJS Textures (Medium Severity): Users could provide excessively large or malformed image files as textures, leading to client-side resource exhaustion or PixiJS rendering errors.
• Impact:
  • Cross-Site Scripting (XSS) via Malicious PixiJS Textures (Medium Reduction): Reduces the risk of XSS attacks through manipulated image textures used by PixiJS.
  • Denial of Service (DoS) via Large or Malformed PixiJS Textures (Medium Reduction): Helps prevent DoS attacks by validating and controlling image textures used in PixiJS.
• Currently Implemented:
  • Partially implemented. Client-side file type and size validation exists for avatar uploads, some of which are used as PixiJS textures.
• Missing Implementation:
  • Server-side validation and sanitization of uploaded images used as PixiJS textures are missing. URL validation and whitelisting for image URLs used as PixiJS textures are not implemented.

Mitigation Strategy: 6. Limit User Control Over PixiJS API Parameters

• Mitigation Strategy: Limit User Control Over Direct PixiJS API Parameters
• Description:
  1. Identify User-Influenced PixiJS API Calls: Analyze code to find areas where user input directly controls parameters of PixiJS API functions, especially those related to rendering, resource loading, or event handling.
  2. Abstract PixiJS API Interactions: Introduce an abstraction layer to mediate user interactions with PixiJS. Instead of direct API access, create controlled functions that validate and sanitize user inputs before translating them into PixiJS API calls.
  3. Validate and Sanitize PixiJS API Parameters: Thoroughly validate and sanitize any user input that will be used as parameters for PixiJS API functions to prevent unexpected behavior or manipulation of PixiJS rendering logic.
• List of Threats Mitigated:
  • Parameter Tampering in PixiJS Rendering (Medium Severity): Attackers could manipulate user-controlled parameters passed to PixiJS APIs to alter rendering behavior, potentially causing logic flaws or resource issues within the PixiJS context.
  • Denial of Service (DoS) via PixiJS API Abuse (Medium Severity): Uncontrolled user input to PixiJS APIs could be exploited to trigger resource-intensive PixiJS operations, leading to DoS.
• Impact:
  • Parameter Tampering in PixiJS Rendering (Medium Reduction): Reduces the risk of unintended or malicious manipulation of PixiJS rendering through parameter tampering.
  • Denial of Service (DoS) via PixiJS API Abuse (Medium Reduction): Helps prevent DoS attacks by controlling user influence over resource-intensive PixiJS API calls.
• Currently Implemented:
  • Partially implemented. Basic input validation exists for some user interactions affecting PixiJS elements, but more comprehensive control is needed.
• Missing Implementation:
  • A stronger abstraction layer is needed to further isolate user input from direct PixiJS API access. Comprehensive validation and sanitization should be applied to all user inputs that influence PixiJS API parameters.

Mitigation Strategy: 7. Implement Resource Limits for PixiJS Graphics

• Mitigation Strategy: Implement Resource Limits for PixiJS Graphics Rendering
• Description:
  1. Identify Resource-Intensive PixiJS Features: Determine which PixiJS features and elements are most resource-intensive in your application (e.g., number of sprites, filters, complex graphics).
  2. Set PixiJS Resource Limits: Define and enforce limits on the usage of these resource-intensive PixiJS features. For example, limit the maximum number of sprites, filters, or textures that can be active in a PixiJS scene at once.
  3. Enforce Limits in PixiJS Code: Implement code within your PixiJS application to track resource usage and enforce the defined limits. Prevent creation of new PixiJS objects or features if limits are exceeded.
  4. Handle PixiJS Resource Limit Exceeded Events: Define how your application should respond when PixiJS resource limits are reached, such as preventing further resource creation or implementing resource culling within the PixiJS scene.
• List of Threats Mitigated:
  • Denial of Service (DoS) via PixiJS Resource Exhaustion (High Severity): Attackers could intentionally create complex PixiJS scenes or trigger actions that consume excessive client-side resources (CPU, GPU, memory) through PixiJS rendering.
• Impact:
  • Denial of Service (DoS) via PixiJS Resource Exhaustion (High Reduction): Significantly reduces the risk of DoS attacks by limiting the resources that can be consumed by PixiJS rendering.
• Currently Implemented:
  • Partially implemented. Basic limits exist for interactive elements in scenes, but primarily for gameplay balance, not explicit PixiJS resource security.
• Missing Implementation:
  • Explicit resource limits focused on PixiJS graphics resources (sprites, textures, filters, rendering complexity) need to be implemented to prevent DoS and performance degradation related to PixiJS rendering.

Mitigation Strategy: 8. Optimize Texture Loading and Management in PixiJS

• Mitigation Strategy: Optimize PixiJS Texture Loading and Management
• Description:
  1. Utilize PixiJS Texture Atlases and Sprite Sheets: Employ PixiJS texture atlases and sprite sheets to combine multiple textures into single images, reducing draw calls and improving PixiJS rendering performance.
  2. Optimize PixiJS Texture Formats: Use optimized image formats for PixiJS textures (e.g., WebP, compressed PNG) to reduce file sizes and loading times, improving PixiJS asset loading efficiency.
  3. Leverage PixiJS Texture Caching: Utilize PixiJS's built-in texture caching mechanisms to avoid redundant loading of textures, optimizing PixiJS resource management.
  4. Implement Lazy Loading for PixiJS Textures: Load PixiJS textures only when they are actually needed for rendering, rather than loading all textures upfront, especially in large PixiJS applications.
  5. Manage PixiJS Texture Memory: Implement proper memory management for PixiJS textures, unloading textures that are no longer in use to free up memory and optimize PixiJS resource usage.
• List of Threats Mitigated:
  • Denial of Service (DoS) via PixiJS Texture Loading (Medium Severity): Attackers could trigger loading of numerous PixiJS textures, potentially exhausting client-side resources or bandwidth, leading to DoS.
  • Performance Degradation in PixiJS Rendering (High Severity): Inefficient texture loading and management can severely degrade PixiJS rendering performance and user experience.
• Impact:
  • Denial of Service (DoS) via PixiJS Texture Loading (Medium Reduction): Reduces DoS risk by optimizing PixiJS texture loading and limiting potential for abuse.
  • Performance Degradation in PixiJS Rendering (High Reduction): Significantly improves PixiJS rendering performance, loading times, and overall application responsiveness.
• Currently Implemented:
  • Partially implemented. Texture atlases are used for some assets. PixiJS's default texture caching is utilized.
• Missing Implementation:
  • Systematic use of texture atlases and sprite sheets across all PixiJS assets is needed. Texture compression for PixiJS textures is not consistently applied. Lazy loading and explicit PixiJS texture memory management are not fully implemented.

Mitigation Strategy: 9. Control Frame Rate and Rendering Complexity in PixiJS

• Mitigation Strategy: Control Frame Rate and Rendering Complexity in PixiJS Applications
• Description:
  1. Implement Frame Rate Limiting for PixiJS: Cap the maximum frame rate of your PixiJS application to prevent excessive CPU and GPU usage during PixiJS rendering.
  2. Debounce/Throttle PixiJS Rendering Updates: If rendering updates are triggered by user input or events, use debouncing or throttling to limit the frequency of PixiJS rendering calls, preventing overload.
  3. Level of Detail (LOD) in PixiJS Scenes: Implement LOD techniques within your PixiJS scenes to reduce rendering complexity for objects that are less important or further away, optimizing PixiJS rendering load.
  4. Visibility Culling in PixiJS: Utilize PixiJS visibility culling to avoid rendering objects that are not currently visible in the PixiJS viewport, reducing unnecessary rendering overhead.
  5. Optimize PixiJS Rendering Loops: Review and optimize your PixiJS rendering loops to ensure efficient code and minimize unnecessary computations or draw calls within the PixiJS rendering process.
• List of Threats Mitigated:
  • Denial of Service (DoS) via PixiJS Rendering Overload (High Severity): Attackers could trigger actions causing excessive PixiJS rendering complexity, leading to CPU/GPU overload and DoS.
  • Performance Degradation in PixiJS Applications (High Severity): Uncontrolled PixiJS rendering complexity can lead to significant performance drops and poor user experience.
• Impact:
  • Denial of Service (DoS) via PixiJS Rendering Overload (High Reduction): Significantly reduces DoS risk by controlling PixiJS rendering complexity and frame rate.
  • Performance Degradation in PixiJS Applications (High Reduction): Improves PixiJS application performance, frame rates, and user experience by managing rendering load.
• Currently Implemented:
  • Partially implemented. Frame rate is limited. Basic visibility culling is used for some PixiJS elements.
• Missing Implementation:
  • Debouncing/throttling of PixiJS rendering updates is not consistently applied. LOD techniques in PixiJS scenes are not implemented. PixiJS rendering loops could be further optimized for efficiency.

Mitigation Strategy: 10. PixiJS-Specific Security Considerations in Code Reviews

• Mitigation Strategy: Integrate PixiJS Security Checks into Code Reviews
• Description:
  1. Train Developers on PixiJS Security: Educate developers on security risks specific to PixiJS, including vulnerabilities related to user input, resource management within PixiJS, and CSP in the context of PixiJS rendering.
  2. PixiJS Security Code Review Checklists: Create code review checklists that include specific security points relevant to PixiJS usage, such as input validation for PixiJS text and textures, PixiJS resource limits, and secure PixiJS API usage.
  3. Focus on PixiJS Security in Reviews: During code reviews, specifically examine code related to PixiJS integration for potential security vulnerabilities and adherence to PixiJS security best practices.
• List of Threats Mitigated:
  • All PixiJS-Related Threats (Variable Severity): Code reviews focused on PixiJS security help catch a wide range of vulnerabilities specific to PixiJS integration.
• Impact:
  • All PixiJS-Related Threats (Medium to High Reduction): Proactive security reviews are effective in preventing PixiJS-related security issues before production.
• Currently Implemented:
  • Partially implemented. Code reviews are standard, but PixiJS-specific security considerations are not yet formally integrated.
• Missing Implementation:
  • Formal PixiJS security training for developers is needed. PixiJS-specific security checklists for code reviews should be created and used to ensure consistent security focus during development.

Mitigation Strategy: 11. Regular Security Audits of PixiJS Integration

• Mitigation Strategy: Conduct Regular Security Audits of PixiJS Integration
• Description:
  1. Schedule PixiJS Security Audits: Plan regular security audits specifically focused on the PixiJS integration within your application.
  2. Focus Audit Scope on PixiJS: Define the audit scope to specifically cover PixiJS-related security aspects, including code review of PixiJS usage, CSP effectiveness for PixiJS, input validation for PixiJS inputs, and PixiJS resource management.
  3. Penetration Testing of PixiJS Features: Include penetration testing specifically targeting PixiJS-related features to identify potential vulnerabilities in the PixiJS integration.
• List of Threats Mitigated:
  • All PixiJS-Related Threats (Variable Severity): Security audits focused on PixiJS provide a comprehensive assessment of security posture related to PixiJS and help identify and address vulnerabilities.
• Impact:
  • All PixiJS-Related Threats (High Reduction): Regular PixiJS-focused security audits are crucial for maintaining a strong security posture and proactively mitigating PixiJS-related vulnerabilities.
• Currently Implemented:
  • No, dedicated security audits focused specifically on PixiJS integration are not currently performed.
• Missing Implementation:
  • A schedule for regular PixiJS integration security audits needs to be established, with a defined scope and resources allocated for conducting these audits.