[CVE-2022-35949]: undici.request vulnerable to SSRF using absolute / protocol-relative URL on pathname

Summary

undici.request vulnerable to SSRF using absolute URL on pathname

Package: undici (npm) Affected versions: =< 5.8.1 Patched versions: 5.8.2

Impact undici is vulnerable to SSRF (Server-side Request Forgery) when an application takes in user input into the path/pathname option of undici.request.

If a user specifies a URL such as http://127.0.0.1 or //127.0.0.1

const undici = require("undici") undici.request({origin: "http://example.com", pathname: "//127.0.0.1"})

Instead of processing the request as http://example.org//127.0.0.1 (or http://example.org/http://127.0.0.1 when http://127.0.0.1 is used), it actually processes the request as http://127.0.0.1/ and sends it to http://127.0.0.1.

If a developer passes in user input into path parameter of undici.request, it can result in an SSRF as they will assume that the hostname cannot change, when in actual fact it can change because the specified path parameter is combined with the base URL.

Patches This issue was fixed in undici @ 5.8.1.

Workarounds The best workaround is to validate user input before passing it to the undici.request call.

Full GHSA Link: https://github.com/nodejs/undici/security/advisories/GHSA-8qr4-xgw6-wmr3