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Threat Model Analysis for hakimel/reveal.js

Threat: Cross-Site Scripting (XSS) via Malicious Presentation Content

Description: An attacker injects malicious JavaScript code into the presentation content (Markdown, HTML slides, or Reveal.js configuration). This code executes when a user views the presentation. The attacker might steal session cookies, redirect the user to a malicious website, deface the presentation, or perform actions on behalf of the user.

  • Impact: High - Full account compromise, data theft, website defacement, malware distribution.
  • Affected Reveal.js Component: Core Reveal.js rendering engine, Markdown parser, HTML slide rendering, Configuration parsing.
  • Risk Severity: High
  • Mitigation Strategies:
    • Developers:
      • Implement robust server-side and client-side sanitization of all user-provided content before it's used in presentations. Use a well-vetted HTML sanitizer library.
      • Enforce Content Security Policy (CSP) to restrict script sources and inline script execution.
      • Avoid dynamically generating Reveal.js configuration from user input without strict validation and sanitization.
      • Regularly update Reveal.js and all plugins to the latest versions to patch known vulnerabilities.
    • Users (Content Creators):
      • Be cautious about including external content or code snippets from untrusted sources in presentations.
      • Validate and sanitize any external content before including it in the presentation.

Threat: Client-Side Code Injection via Vulnerable/Malicious Plugins or Themes

Description: An attacker leverages a vulnerability in a Reveal.js plugin or theme, or uses a deliberately malicious plugin/theme, to inject and execute arbitrary JavaScript code within the user's browser when viewing a presentation using that plugin/theme. This can lead to similar outcomes as XSS.

  • Impact: High - Depending on the plugin/theme's capabilities, potential for account compromise, data theft, or malicious actions within the presentation context.
  • Affected Reveal.js Component: Reveal.js Plugin system, Theme loading mechanism.
  • Risk Severity: High
  • Mitigation Strategies:
    • Developers:
      • Thoroughly vet and audit all third-party Reveal.js plugins and themes before integrating them into the application.
      • Only use plugins and themes from reputable and trusted sources with active maintenance and security records.
      • Keep all plugins and themes updated to their latest versions.
      • Implement Subresource Integrity (SRI) for plugin and theme files to ensure file integrity and prevent tampering.
    • Users (Developers/Administrators):
      • Carefully review the code of plugins and themes before installation, especially those from unknown sources.
      • Prefer using official or widely adopted plugins and themes with community support.