ghsa-p6j9-7xhc-rhwp
Vulnerability from github
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
{ "affected": [ { "ecosystem_specific": { "affected_functions": [ "(urijs).parse" ] }, "package": { "ecosystem": "npm", "name": "urijs" }, "ranges": [ { "events": [ { "introduced": "0" }, { "fixed": "1.19.6" } ], "type": "ECOSYSTEM" } ] } ], "aliases": [ "CVE-2021-27516" ], "database_specific": { "cwe_ids": [ "CWE-20" ], "github_reviewed": true, "github_reviewed_at": "2021-02-26T21:37:41Z", "nvd_published_at": "2021-02-22T00:15:00Z", "severity": "HIGH" }, "details": "### Impact\nIf using affected versions to determine a URL\u0027s 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.\n\nDepending on library usage and attacker intent, impacts may include allow/block list bypasses, SSRF attacks, open redirects, or other undesired behavior.\n\nExample URL: `https:/\\expected-example.com/path`\nEscaped string: `https:/\\\\expected-example.com/path` (JavaScript strings must escape backslash)\n\nAffected 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\u0027s built-in URL class](https://nodejs.org/api/url.html).\n\n### Patches\nVersion 1.19.6 is patched against all known payload variants.\n\n### References\nhttps://github.com/medialize/URI.js/releases/tag/v1.19.6 (fix for this particular bypass)\nhttps://github.com/medialize/URI.js/releases/tag/v1.19.4 (fix for related bypass)\nhttps://github.com/medialize/URI.js/releases/tag/v1.19.3 (fix for related bypass)\n[PR #233](https://github.com/medialize/URI.js/pull/233) (initial fix for backslash handling)\n\n### For more information\nIf you have any questions or comments about this advisory, open an issue in https://github.com/medialize/URI.js\n\n### Reporter credit\n[Yaniv Nizry](https://twitter.com/ynizry) from the CxSCA AppSec team at Checkmarx", "id": "GHSA-p6j9-7xhc-rhwp", "modified": "2023-09-07T20:24:16Z", "published": "2021-03-01T20:03:53Z", "references": [ { "type": "WEB", "url": "https://github.com/medialize/URI.js/security/advisories/GHSA-p6j9-7xhc-rhwp" }, { "type": "ADVISORY", "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-27516" }, { "type": "WEB", "url": "https://github.com/medialize/URI.js/commit/a1ad8bcbc39a4d136d7e252e76e957f3ece70839" }, { "type": "WEB", "url": "https://advisory.checkmarx.net/advisory/CX-2021-4305" }, { "type": "PACKAGE", "url": "https://github.com/medialize/URI.js" }, { "type": "WEB", "url": "https://github.com/medialize/URI.js/releases/tag/v1.19.6" } ], "schema_version": "1.4.0", "severity": [ { "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "type": "CVSS_V3" } ], "summary": "URIjs Hostname spoofing via backslashes in URL" }
Sightings
Author | Source | Type | Date |
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Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.