Vulnerability-Lookup

GHSA-3329-PJWV-FJPG

Vulnerability from github – Published: 2020-12-30 23:40 – Updated: 2022-11-30 03:23

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

Severity

6.5 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "urijs"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.19.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2020-26291"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-20"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2020-12-30T23:40:28Z",
    "nvd_published_at": "2020-12-31T00:15:00Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\nIf using affected versions to determine a URL\u0027s 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.\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\\@observed-example.com`\nEscaped string: `https://expected-example.com\\\\@observed-example.com` (JavaScript strings must escape backslash)\n\nAffected 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](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 1.19.4 is patched against all known payload variants. Version 1.19.3 has a partial patch but is still vulnerable to a payload variant.\n\n### References\nhttps://github.com/medialize/URI.js/releases/tag/v1.19.4 (complete fix for this bypass)\nhttps://github.com/medialize/URI.js/releases/tag/v1.19.3 (partial fix for this 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[Alesandro Ortiz](https://AlesandroOrtiz.com)",
  "id": "GHSA-3329-pjwv-fjpg",
  "modified": "2022-11-30T03:23:13Z",
  "published": "2020-12-30T23:40:48Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/medialize/URI.js/security/advisories/GHSA-3329-pjwv-fjpg"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-26291"
    },
    {
      "type": "WEB",
      "url": "https://github.com/medialize/URI.js/commit/b02bf037c99ac9316b77ff8bfd840e90becf1155"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/medialize/URI.js"
    },
    {
      "type": "WEB",
      "url": "https://github.com/medialize/URI.js/releases/tag/v1.19.4"
    },
    {
      "type": "WEB",
      "url": "https://www.npmjs.com/advisories/1595"
    },
    {
      "type": "WEB",
      "url": "https://www.npmjs.com/package/urijs"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Hostname spoofing via backslashes in URL"
}

CVE-2020-26291 (GCVE-0-2020-26291)

Vulnerability from cvelistv5 – Published: 2020-12-30 23:40 – Updated: 2024-08-04 15:56

Title

Hostname spoofing in URI.js

Summary

URI.js is a javascript URL mutation library (npm package urijs). In URI.js before version 1.19.4, 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. For example the URL `https://expected-example.com\@observed-example.com` will incorrectly return `observed-example.com` if using an affected version. 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. 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.]

Severity

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

CWE

CWE-20 - Improper Input Validation

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/medialize/URI.js/security/advi…	x_refsource_CONFIRM
https://www.npmjs.com/package/urijs	x_refsource_MISC
https://github.com/medialize/URI.js/releases/tag/…	x_refsource_MISC
https://github.com/medialize/URI.js/commit/b02bf0…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
medialize	URI.js	Affected: < 1.19.4

Show details on NVD website

JSON

To clipboard

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          }
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        }
      ],
      "metrics": [
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          "url": "https://www.npmjs.com/package/urijs"
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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

GHSA-3329-PJWV-FJPG

Impact

Patches

References

For more information

Reporter credit

CVE-2020-26291 (GCVE-0-2020-26291)

Tags

Sightings

Nomenclature

Related by attack behaviour