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Security Advisories: MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLTg5Z3YtaDh3Zi1jZzhy

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, including web browsers and Node's built-in URL class.

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 (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 via https://huntr.dev/

Permalink: https://github.com/advisories/GHSA-89gv-h8wf-cg8r
JSON: https://advisories.ecosyste.ms/api/v1/advisories/MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLTg5Z3YtaDh3Zi1jZzhy
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: over 2 years ago
Updated: 7 months ago


CVSS Score: 5.3
CVSS vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Identifiers: GHSA-89gv-h8wf-cg8r, CVE-2021-3647
References: Repository: https://github.com/medialize/URI.js

Affected Packages

npm:urijs
Dependent packages: 1,163
Dependent repositories: 187,610
Downloads: 8,332,507 last month
Affected Version Ranges: < 1.19.7
Fixed in: 1.19.7
All affected versions: 1.16.1, 1.17.0, 1.17.1, 1.18.0, 1.18.1, 1.18.2, 1.18.3, 1.18.4, 1.18.5, 1.18.6, 1.18.7, 1.18.8, 1.18.9, 1.18.10, 1.18.11, 1.18.12, 1.19.0, 1.19.1, 1.19.2, 1.19.3, 1.19.4, 1.19.5, 1.19.6
All unaffected versions: 1.19.7, 1.19.8, 1.19.9, 1.19.10, 1.19.11