ghsa-p6j9-7xhc-rhwp
Vulnerability from github
Published
2021-03-01 20:03
Modified
2023-09-07 20:24
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
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

Show details on source website

To clipboard 

{
  "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"
}


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