Description
Faraday is an HTTP client library abstraction layer that provides a common interface over many adapters. Prior to 2.14.1, Faraday's build_exclusive_url method (in lib/faraday/connection.rb) uses Ruby's URI#merge to combine the connection's base URL with a user-supplied path. Per RFC 3986, protocol-relative URLs (e.g. //evil.com/path) are treated as network-path references that override the base URL's host/authority component. This means that if any application passes user-controlled input to Faraday's get(), post(), build_url(), or other request methods, an attacker can supply a protocol-relative URL like //attacker.com/endpoint to redirect the request to an arbitrary host, enabling Server-Side Request Forgery (SSRF). This vulnerability is fixed in 2.14.1.
Problem types
CWE-918: Server-Side Request Forgery (SSRF)
Product status
References
github.com/...araday/security/advisories/GHSA-33mh-2634-fwr2
github.com/...ommit/a6d3a3a0bf59c2ab307d0abd91bc126aef5561bc
github.com/lostisland/faraday/releases/tag/v2.14.1