CVE-2021-3647 – urijs

Package

Manager: npm
Name: urijs
Vulnerable Version: >=0 <1.19.7

Severity

Level: Medium

CVSS v3.1: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

EPSS: 0.00175 pctl0.39253

Details

URIjs Vulnerable to Hostname spoofing via backslashes in URL ### Impact If using affected versions to determine a URL's hostname, the hostname can be spoofed by using a combination of backslash (`\`) and slash (`/`) characters as part of the scheme delimiter, e.g. `scheme:/\/\/\hostname`. 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/path` Escaped string: `https:/\\/\\/\\expected-example.com/path` (JavaScript strings must escape backslash) Affected versions incorrectly return no hostname. Patched versions correctly return `expected-example.com`. Patched versions match the behavior of other parsers which implement the [WHATWG URL specification](https://url.spec.whatwg.org/), including web browsers and [Node's built-in URL class](https://nodejs.org/api/url.html). ### Patches Version 1.19.7 is patched against all known payload variants. ### References https://github.com/medialize/URI.js/releases/tag/v1.19.7 (fix for this particular bypass) https://github.com/medialize/URI.js/releases/tag/v1.19.6 (fix for related bypass) https://github.com/medialize/URI.js/releases/tag/v1.19.4 (fix for related bypass) https://github.com/medialize/URI.js/releases/tag/v1.19.3 (fix for related bypass) [PR #233](https://github.com/medialize/URI.js/pull/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 [ready-research](https://github.com/ready-research) via https://huntr.dev/

Metadata

Created: 2021-07-19T21:22:36Z
Modified: 2023-09-07T20:18:00Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/07/GHSA-89gv-h8wf-cg8r/GHSA-89gv-h8wf-cg8r.json
CWE IDs: ["CWE-601"]
Alternative ID: GHSA-89gv-h8wf-cg8r
Finding: F100
Auto approve: 1