Description

zrok is software for sharing web services, files, and network resources. Prior to version 2.0.1, the proxyUi template engine uses Go's text/template (which performs no HTML escaping) instead of html/template. The GitHub OAuth callback handlers in both publicProxy and dynamicProxy embed the attacker-controlled refreshInterval query parameter verbatim into an error message when time.ParseDuration fails, and render that error unescaped into HTML. An attacker can deliver a crafted login URL to a victim; after the victim completes the GitHub OAuth flow, the callback page executes arbitrary JavaScript in the OAuth server's origin. Version 2.0.1 patches the issue.

Weaknesses 2

Affected Products 1

References 2

• github.com https://github.com/openziti/zrok/releases/tag/v2.0.1
  Release Notes
• github.com https://github.com/openziti/zrok/security/advisories/GHSA-4fxq-2x3x-6xqx
  Vendor Advisory

Remediation