Vulnerability-Lookup

FKIE_CVE-2020-15240

Vulnerability from fkie_nvd - Published: 2020-10-21 18:15 - Updated: 2026-06-17 02:56

Severity

7.4 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
9.1 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Summary

omniauth-auth0 (rubygems) versions >= 2.3.0 and < 2.4.1 improperly validate the JWT token signature when using the `jwt_validator.verify` method. Improper validation of the JWT token signature can allow an attacker to bypass authentication and authorization. You are affected by this vulnerability if all of the following conditions apply: 1. You are using `omniauth-auth0`. 2. You are using `JWTValidator.verify` method directly OR you are not authenticating using the SDK’s default Authorization Code Flow. The issue is patched in version 2.4.1.

References

URL	Tags
security-advisories@github.com	https://github.com/auth0/omniauth-auth0/commit/fd3a14f4ccdfbc515d1121d6378ff88bf55a7a7a	Patch, Third Party Advisory
security-advisories@github.com	https://github.com/auth0/omniauth-auth0/security/advisories/GHSA-58r4-h6v8-jcvm	Third Party Advisory
security-advisories@github.com	https://rubygems.org/gems/omniauth-auth0	Product, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108	https://github.com/auth0/omniauth-auth0/commit/fd3a14f4ccdfbc515d1121d6378ff88bf55a7a7a	Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://github.com/auth0/omniauth-auth0/security/advisories/GHSA-58r4-h6v8-jcvm	Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://rubygems.org/gems/omniauth-auth0	Product, Vendor Advisory

Impacted products

	Vendor	Product	Version
	auth0	omniauth-auth0	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "omniauth-auth0",
          "vendor": "auth0",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 2.3.0, \u003c2.4.1"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:auth0:omniauth-auth0:*:*:*:*:*:ruby:*:*",
              "matchCriteriaId": "8273AC75-02BD-48A7-A599-36E93B268A73",
              "versionEndExcluding": "2.4.1",
              "versionStartIncluding": "2.3.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "omniauth-auth0 (rubygems) versions \u003e= 2.3.0 and \u003c 2.4.1 improperly validate the JWT token signature when using the `jwt_validator.verify` method. Improper validation of the JWT token signature can allow an attacker to bypass authentication and authorization. You are affected by this vulnerability if all of the following conditions apply: 1. You are using `omniauth-auth0`. 2. You are using `JWTValidator.verify` method directly OR you are not authenticating using the SDK\u2019s default Authorization Code Flow. The issue is patched in version 2.4.1."
    },
    {
      "lang": "es",
      "value": "omniauth-auth0 (rubygems) versiones posteriores a 2.3.0 incluy\u00e9ndola y versiones anteriores a 2.4.1, comprueban inapropiadamente la firma del token de JWT cuando utiliza el m\u00e9todo \"jwt_validator.verify\".\u0026#xa0;La comprobaci\u00f3n inapropiada de la firma del token de JWT puede permitir a un atacante omitir la autenticaci\u00f3n y la autorizaci\u00f3n.\u0026#xa0;Estas afectado por esta vulnerabilidad si se cumplen todas las condiciones siguientes: 1. Est\u00e1 utilizando \"omniauth-auth0\".\u0026#xa0;2. Est\u00e1 usando el m\u00e9todo \"JWTValidator.verify\" directamente O no est\u00e1 autentic\u00e1ndose usando el Authorization Code Flow predeterminado del SDK.\u0026#xa0;El problema est\u00e1 parcheado en la versi\u00f3n 2.4.1"
    }
  ],
  "id": "CVE-2020-15240",
  "lastModified": "2026-06-17T02:56:20.360",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "MEDIUM",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "NONE",
          "baseScore": 5.8,
          "confidentialityImpact": "PARTIAL",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:N",
          "version": "2.0"
        },
        "exploitabilityScore": 8.6,
        "impactScore": 4.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 7.4,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 5.2,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 9.1,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.2,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2020-10-21T18:15:12.813",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/auth0/omniauth-auth0/commit/fd3a14f4ccdfbc515d1121d6378ff88bf55a7a7a"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://github.com/auth0/omniauth-auth0/security/advisories/GHSA-58r4-h6v8-jcvm"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Product",
        "Vendor Advisory"
      ],
      "url": "https://rubygems.org/gems/omniauth-auth0"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/auth0/omniauth-auth0/commit/fd3a14f4ccdfbc515d1121d6378ff88bf55a7a7a"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://github.com/auth0/omniauth-auth0/security/advisories/GHSA-58r4-h6v8-jcvm"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Product",
        "Vendor Advisory"
      ],
      "url": "https://rubygems.org/gems/omniauth-auth0"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-287"
        },
        {
          "lang": "en",
          "value": "CWE-347"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-347"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2020-15240 (GCVE-0-2020-15240)

Vulnerability from cvelistv5 – Published: 2020-10-21 17:25 – Updated: 2024-08-04 13:08

Title

Regression in JWT Signature Validation

Summary

Severity

7.4 (High)


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

CWE

CWE-287 - Improper Authentication
CWE-347 - Improper Verification of Cryptographic Signature

Assigner

GitHub_M mitre root

References

3 references

URL	Tags
https://github.com/auth0/omniauth-auth0/security/…	x_refsource_CONFIRM
https://github.com/auth0/omniauth-auth0/commit/fd…	x_refsource_MISC
https://rubygems.org/gems/omniauth-auth0	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
auth0	omniauth-auth0	Affected: >= 2.3.0, <2.4.1

Show details on NVD website

JSON

To clipboard

{
  "containers": {
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      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T13:08:22.896Z",
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              "x_transferred"
            ],
            "url": "https://github.com/auth0/omniauth-auth0/security/advisories/GHSA-58r4-h6v8-jcvm"
          },
          {
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            ],
            "url": "https://github.com/auth0/omniauth-auth0/commit/fd3a14f4ccdfbc515d1121d6378ff88bf55a7a7a"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://rubygems.org/gems/omniauth-auth0"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "omniauth-auth0",
          "vendor": "auth0",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 2.3.0, \u003c2.4.1"
            }
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "omniauth-auth0 (rubygems) versions \u003e= 2.3.0 and \u003c 2.4.1 improperly validate the JWT token signature when using the `jwt_validator.verify` method. Improper validation of the JWT token signature can allow an attacker to bypass authentication and authorization. You are affected by this vulnerability if all of the following conditions apply: 1. You are using `omniauth-auth0`. 2. You are using `JWTValidator.verify` method directly OR you are not authenticating using the SDK\u2019s default Authorization Code Flow. The issue is patched in version 2.4.1."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
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            "version": "3.1"
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      ],
      "problemTypes": [
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          "descriptions": [
            {
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              "description": "CWE-347 Improper Verification of Cryptographic Signature",
              "lang": "en",
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      "providerMetadata": {
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          "url": "https://rubygems.org/gems/omniauth-auth0"
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      "source": {
        "advisory": "GHSA-58r4-h6v8-jcvm",
        "discovery": "UNKNOWN"
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      "title": "Regression in JWT Signature Validation",
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        },
        "affects": {
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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.