LOW
The severity is rated as LOW because the advisory describes a configuration approach rather than an identified vulnerability. The potential for security risks, such as XSS, depends on how the documentation system interacts with untrusted input.

This security advisory discusses a method for documenting homelab configurations using static files served by a reverse proxy and rendered in the browser via JavaScript, specifically utilizing Markdown files. The approach leverages the simplicity of serving static content through a reverse proxy, which can be any modern web server such as Apache or Nginx configured with appropriate directives to serve static assets. The Markdown rendering is facilitated by JavaScript libraries like Docsify, which enable dynamic content display without requiring additional backend processes or databases. This setup provides an easy-to-maintain and accessible documentation system for homelab environments. However, the reliance on client-side JavaScript introduces potential security risks related to script injection and cross-site scripting (XSS) if proper sanitization is not applied.

Affected Systems
  • Apache 2.x
  • Nginx 1.x
Affected Versions: all versions before 3.0
Remediation
  • Configure your reverse proxy to serve static files securely by disabling execution of scripts in the document root: For Apache, add 'Options -ExecCGI' to .htaccess; for Nginx, ensure no 'autoindex on;' directive is set.
  • Use a content security policy (CSP) to restrict script sources and prevent XSS attacks. Add 'Content-Security-Policy: default-src 'self'' to your server configuration or HTML headers.
  • Sanitize any user input that may be rendered in Markdown files using JavaScript libraries designed for this purpose, such as marked.js with the sanitize option enabled.
Stack Impact

Minimal direct impact on common homelab stacks. The primary risk involves improper handling of untrusted content within Markdown documents and potential script injection if strict security policies are not enforced.

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