GHSA-3329-pjwv-fjpg

Suggest an improvement
Source
https://github.com/advisories/GHSA-3329-pjwv-fjpg
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2020/12/GHSA-3329-pjwv-fjpg/GHSA-3329-pjwv-fjpg.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-3329-pjwv-fjpg
Aliases
Related
Published
2020-12-30T23:40:48Z
Modified
2026-03-13T22:01:19.395265Z
Severity
  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N CVSS Calculator
Summary
Hostname spoofing via backslashes in URL
Details

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

Database specific 
{
    "severity": "MODERATE",
    "cwe_ids": [
        "CWE-20"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2020-12-30T23:40:28Z",
    "nvd_published_at": "2020-12-31T00:15:00Z"
}
References

Affected packages

npm / urijs

Package

Name
urijs
View open source insights on deps.dev
Purl
pkg:npm/urijs

Affected ranges

Type
SEMVER
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.19.4

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2020/12/GHSA-3329-pjwv-fjpg/GHSA-3329-pjwv-fjpg.json"