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Attack Surface Analysis for hakimel/reveal.js

Attack Surface: Cross-Site Scripting (XSS) via Markdown Injection

  • Description: Malicious scripts are injected through Markdown syntax within reveal.js slides, executing in a user's browser when the presentation is viewed.
  • Reveal.js Contribution: The reveal.js Markdown plugin renders Markdown content directly to HTML. Without proper sanitization of user-provided Markdown, malicious code can be injected and executed.
  • Example: Injecting [Malicious Link](javascript:alert('XSS')) in Markdown content. When rendered by reveal.js, clicking the link executes JavaScript.
  • Impact: Account compromise, session hijacking, data theft, website defacement.
  • Risk Severity: High
  • Mitigation Strategies:
    • Sanitize Markdown Input: Always sanitize user-supplied Markdown content before it is processed by reveal.js. Utilize a robust Markdown parser and sanitizer library to remove or escape potentially harmful HTML and JavaScript.
    • Content Security Policy (CSP): Implement a strict CSP to limit script execution and resource loading, reducing the impact of successful XSS.

Attack Surface: Cross-Site Scripting (XSS) via HTML Injection

  • Description: Malicious scripts are injected directly within HTML code embedded in reveal.js slides, leading to script execution in the user's browser.
  • Reveal.js Contribution: reveal.js allows direct embedding of HTML within slides. If user-provided HTML is not sanitized, attackers can inject and execute arbitrary JavaScript.
  • Example: Injecting <img src="x" onerror="alert('XSS')"> within a slide. When reveal.js renders this, the onerror event executes JavaScript.
  • Impact: Account compromise, session hijacking, data theft, website defacement.
  • Risk Severity: High
  • Mitigation Strategies:
    • Sanitize HTML Input: Sanitize all user-provided HTML content before rendering it with reveal.js. Employ a dedicated HTML sanitizer library to remove or escape dangerous HTML tags and attributes, especially event handlers.
    • Content Security Policy (CSP): Implement a strict CSP to control script sources and execution, mitigating XSS risks.

Attack Surface: Plugin Vulnerabilities (XSS in Reveal.js Plugins)

  • Description: Vulnerabilities within reveal.js plugins allow attackers to inject and execute malicious scripts through the plugin's functionality.
  • Reveal.js Contribution: Reveal.js's plugin architecture enables extending functionality, but plugins, if vulnerable, can introduce XSS. Plugins often handle dynamic content or user input.
  • Example: A vulnerable chart plugin in reveal.js might fail to sanitize user-provided data used in chart labels, allowing XSS injection.
  • Impact: Account compromise, session hijacking, data theft, website defacement, potentially broader impact depending on plugin privileges.
  • Risk Severity: High
  • Mitigation Strategies:
    • Plugin Security Audits: Regularly audit and review the code of reveal.js plugins for security vulnerabilities, focusing on input handling and rendering logic.
    • Use Trusted Plugins: Prioritize using well-maintained reveal.js plugins from reputable sources. Check for known vulnerabilities and security updates.
    • Keep Plugins Updated: Ensure reveal.js plugins are updated to the latest versions to patch known security flaws.

Attack Surface: Malicious Reveal.js Plugins

  • Description: Attackers introduce intentionally malicious reveal.js plugins to compromise the application or user systems.
  • Reveal.js Contribution: Reveal.js loads plugins as external JavaScript files. If the application allows loading plugins from untrusted sources, malicious plugins can be introduced and executed within the reveal.js context.
  • Example: A user uploads a plugin that appears to add a feature but also contains code to steal credentials or inject malware when loaded by reveal.js.
  • Impact: Full application compromise, data theft, malware distribution, user system compromise.
  • Risk Severity: Critical
  • Mitigation Strategies:
    • Plugin Whitelisting: Strictly control the sources from which reveal.js plugins are loaded. Implement a whitelist of trusted plugin sources or pre-approved plugins.
    • Plugin Code Review: If custom or externally sourced plugins are used, mandate a thorough code review process before deployment to identify and prevent malicious code.

Attack Surface: Dependency Vulnerabilities (Outdated Reveal.js Core and Libraries)

  • Description: Using outdated versions of the reveal.js core framework or its underlying JavaScript dependencies that contain known security vulnerabilities.
  • Reveal.js Contribution: Reveal.js, like any software, relies on its core code and external libraries. Outdated versions can contain publicly known and exploitable vulnerabilities.
  • Example: A known XSS or other vulnerability exists in a specific older version of reveal.js. An application using this outdated version becomes vulnerable to exploitation.
  • Impact: Depending on the vulnerability, impacts can range from XSS to Remote Code Execution (RCE), potentially leading to full application compromise.
  • Risk Severity: High to Critical
  • Mitigation Strategies:
    • Regular Reveal.js Updates: Keep the reveal.js core framework and all its dependencies updated to the latest stable versions. Monitor security advisories and apply patches promptly.
    • Dependency Scanning: Implement automated dependency scanning tools to detect known vulnerabilities in reveal.js and its dependencies. Integrate these scans into the development and deployment pipeline.