An SSRF vulnerability exists in the gradio-app/gradio due to insufficient validation of user-supplied URLs in the /proxy
route. Attackers can exploit this vulnerability by manipulating the self.replica_urls
set through the X-Direct-Url
header in requests to the /
and /config
routes, allowing the addition of arbitrary URLs for proxying. This flaw enables unauthorized proxying of requests and potential access to internal endpoints within the Hugging Face space. The issue arises from the application's inadequate checking of safe URLs in the build_proxy_request
function.