OmniAuth is a flexible authentication system utilizing Rack middleware

Why it is Yellow

• CVSS 6.9 medium

References

• https://github.com/omniauth/omniauth/commit/943b44faea242f063fa9230254fe7d60cfcc9c90
• https://github.com/omniauth/omniauth/security/advisories/GHSA-m27g-v28p-f9fx

Original description

OmniAuth is a flexible authentication system utilizing Rack middleware. Prior to 2.2.0, OmniAuth derives provider callback URLs from request-controlled host information when neither a fixed full_host nor framework-level incoming host validation is configured. A remote unauthenticated client can supply a forged Host header, creating a host header injection risk in applications whose web framework does not verify incoming host headers. Applications using appropriately configured Rails host authorization or a fixed full_host are not affected by this path. This issue is fixed in version 2.2.0.