GHSA-p6j9-7xhc-rhwp

Source

https://github.com/advisories/GHSA-p6j9-7xhc-rhwp

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/03/GHSA-p6j9-7xhc-rhwp/GHSA-p6j9-7xhc-rhwp.json

JSON Data

https://api.test.osv.dev/v1/vulns/GHSA-p6j9-7xhc-rhwp

Aliases

CVE-2021-27516

Published

2021-03-01T20:03:53Z

Modified

2023-11-01T04:54:55.061034Z

Severity

7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS Calculator

Summary

URIjs 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 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 1.19.6 is patched against all known payload variants.

References

https://github.com/medialize/URI.js/releases/tag/v1.19.6 (fix for this particular 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

Yaniv Nizry from the CxSCA AppSec team at Checkmarx

Database specific

{
    "nvd_published_at": "2021-02-22T00:15:00Z",
    "cwe_ids": [
        "CWE-20"
    ],
    "severity": "HIGH",
    "github_reviewed": true,
    "github_reviewed_at": "2021-02-26T21:37:41Z"
}

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

1.19.6

Ecosystem specific

{
    "affected_functions": [
        "(urijs).parse"
    ]
}