GHSA-3329-pjwv-fjpg Hostname spoofing via backslashes in URL

• npm urijs: < 1.19.4 → fixed in 1.19.4

Impact If using affected versions to determine a URL's hostname, the hostname can be spoofed by using a backslash (`\`) character followed by an at (`@`) character. If the hostname is used in security decisions, the decision may be incorrect. Depending on library usage and attacker intent, impacts may include allow/block list bypasses, SSRF attacks, open redirects, or other undesired behavior. Example URL: `https://expected-example.com\@observed-example.com` Escaped string: `https://expected-example.com\\@observed-example.com` (JavaScript strings must escape backslash) Affected versions incorrectly return `observed-example.com`. Patched versions correctly return `expected-example.com`. Patched versions match the behavior of other parsers which implement the WHATWG URL specification, including web browsers and Node's built-in URL class. Patches Version 1.19.4 is patched against all known payload variants. Version 1.19.3 has a partial patch but is still vulnerable to a payload variant. References https://github.com/medialize/URI.js/releases/tag/v1.19.4 (complete fix for this bypass) https://github.com/medialize/URI.js/releases/tag/v1.19.3 (partial fix for this bypass) PR #233 (initial fix for backslash handling) For more information If you have any questions or comments about this advisory, open an issue in https://github.com/medialize/URI.js Reporter credit Alesandro Ortiz