Vulnerability-Lookup

CVE-2024-21670 (GCVE-0-2024-21670)

Vulnerability from cvelistv5 – Published: 2024-01-16 21:44 – Updated: 2024-08-01 22:27

Title

CL-Signatures Revocation Scheme in Ursa has flaws that allow a holder to demonstrate non-revocation of a revoked credential

Summary

Ursa is a cryptographic library for use with blockchains. The revocation schema that is part of the Ursa CL-Signatures implementations has a flaw that could impact the privacy guarantees defined by the AnonCreds verifiable credential model, allowing a malicious holder of a revoked credential to generate a valid Non-Revocation Proof for that credential as part of an AnonCreds presentation. A verifier may verify a credential from a holder as being "not revoked" when in fact, the holder's credential has been revoked. Ursa has moved to end-of-life status and no fix is expected.

Severity

6.5 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-05-20 20:46 UTC

CWE

CWE-327 - Use of a Broken or Risky Cryptographic Algorithm

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7926 records in the last 180 days details

References

1 reference

URL	Tags
https://github.com/hyperledger-archives/ursa/secu…	x_refsource_CONFIRM

Impacted products

2 products

Vendor	Product	Version	CPE status
hyperledger-archives	ursa	Affected: <= 0.3.7	guessed
hyperledger	ursa	Affected: 0 , ≤ 0.3.7 (custom) cpe:2.3:a:hyperledger:ursa::::::::

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "affected": [
          {
            "cpes": [
              "cpe:2.3:a:hyperledger:ursa:*:*:*:*:*:*:*:*"
            ],
            "defaultStatus": "unknown",
            "product": "ursa",
            "vendor": "hyperledger",
            "versions": [
              {
                "lessThanOrEqual": "0.3.7",
                "status": "affected",
                "version": "0",
                "versionType": "custom"
              }
            ]
          }
        ],
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2024-21670",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-05-20T20:46:39.280934Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-06-04T17:37:45.919Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-01T22:27:35.720Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "name": "https://github.com/hyperledger-archives/ursa/security/advisories/GHSA-r78f-4q2q-hvv4",
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://github.com/hyperledger-archives/ursa/security/advisories/GHSA-r78f-4q2q-hvv4"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "ursa",
          "vendor": "hyperledger-archives",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c= 0.3.7"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Ursa is a cryptographic library for use with blockchains. The revocation schema that is part of the Ursa CL-Signatures implementations has a flaw that could impact the privacy guarantees defined by the AnonCreds verifiable credential model, allowing a malicious holder of a revoked credential to generate a valid Non-Revocation Proof for that credential as part of an AnonCreds presentation. A verifier may verify a credential from a holder as being \"not revoked\" when in fact, the holder\u0027s credential has been revoked. Ursa has moved to end-of-life status and no fix is expected."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "PHYSICAL",
            "availabilityImpact": "NONE",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "HIGH",
            "scope": "CHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:P/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-327",
              "description": "CWE-327: Use of a Broken or Risky Cryptographic Algorithm",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-01-16T21:44:05.572Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/hyperledger-archives/ursa/security/advisories/GHSA-r78f-4q2q-hvv4",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/hyperledger-archives/ursa/security/advisories/GHSA-r78f-4q2q-hvv4"
        }
      ],
      "source": {
        "advisory": "GHSA-r78f-4q2q-hvv4",
        "discovery": "UNKNOWN"
      },
      "title": "CL-Signatures Revocation Scheme in Ursa has flaws that allow a holder to demonstrate non-revocation of a revoked credential"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2024-21670",
    "datePublished": "2024-01-16T21:44:05.572Z",
    "dateReserved": "2023-12-29T16:10:20.368Z",
    "dateUpdated": "2024-08-01T22:27:35.720Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2024-21670",
      "date": "2026-10-28",
      "epss": "0.00276",
      "percentile": "0.20029"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "product": "ursa",
                "vendor": "hyperledger-archives",
                "versions": [
                  {
                    "status": "affected",
                    "version": "\u003c= 0.3.7"
                  }
                ]
              }
            ],
            "source": "security-advisories@github.com"
          },
          {
            "affectedData": [
              {
                "cpes": [
                  "cpe:2.3:a:hyperledger:ursa:*:*:*:*:*:*:*:*"
                ],
                "defaultStatus": "unknown",
                "product": "ursa",
                "vendor": "hyperledger",
                "versions": [
                  {
                    "lessThanOrEqual": "0.3.7",
                    "status": "affected",
                    "version": "0",
                    "versionType": "custom"
                  }
                ]
              }
            ],
            "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
          }
        ],
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:a:hyperledger:ursa:0.1.0:*:*:*:*:rust:*:*",
                    "matchCriteriaId": "8997F554-6E18-4F21-B042-4954CD22436D",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "Ursa is a cryptographic library for use with blockchains. The revocation schema that is part of the Ursa CL-Signatures implementations has a flaw that could impact the privacy guarantees defined by the AnonCreds verifiable credential model, allowing a malicious holder of a revoked credential to generate a valid Non-Revocation Proof for that credential as part of an AnonCreds presentation. A verifier may verify a credential from a holder as being \"not revoked\" when in fact, the holder\u0027s credential has been revoked. Ursa has moved to end-of-life status and no fix is expected."
          },
          {
            "lang": "es",
            "value": "Ursa es una librer\u00eda criptogr\u00e1fica para usar con blockchains. El esquema de revocaci\u00f3n que forma parte de las implementaciones de Ursa CL-Signatures tiene un fallo que podr\u00eda afectar las garant\u00edas de privacidad definidas por el modelo de credencial verificable de AnonCreds, permitiendo a un titular malicioso de una credencial revocada generar una prueba de no revocaci\u00f3n v\u00e1lida para esa credencial como parte de una presentaci\u00f3n de AnonCreds. Un verificador puede verificar que una credencial de un titular est\u00e1 \"not revoked\" cuando, en realidad, la credencial del titular ha sido revocada. Ursa ha pasado al estado de fin de vida \u00fatil y no se espera ninguna soluci\u00f3n."
          }
        ],
        "id": "CVE-2024-21670",
        "lastModified": "2026-06-17T07:09:57.713",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "HIGH",
                "attackVector": "PHYSICAL",
                "availabilityImpact": "NONE",
                "baseScore": 6.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "HIGH",
                "scope": "CHANGED",
                "userInteraction": "REQUIRED",
                "vectorString": "CVSS:3.1/AV:P/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:N",
                "version": "3.1"
              },
              "exploitabilityScore": 0.2,
              "impactScore": 5.8,
              "source": "security-advisories@github.com",
              "type": "Secondary"
            },
            {
              "cvssData": {
                "attackComplexity": "HIGH",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 8.1,
                "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:H",
                "version": "3.1"
              },
              "exploitabilityScore": 2.2,
              "impactScore": 5.9,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2024-21670",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "no"
                  },
                  {
                    "technicalImpact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-05-20T20:46:39.280934Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2024-01-16T22:15:45.810",
        "references": [
          {
            "source": "security-advisories@github.com",
            "tags": [
              "Vendor Advisory"
            ],
            "url": "https://github.com/hyperledger-archives/ursa/security/advisories/GHSA-r78f-4q2q-hvv4"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Vendor Advisory"
            ],
            "url": "https://github.com/hyperledger-archives/ursa/security/advisories/GHSA-r78f-4q2q-hvv4"
          }
        ],
        "sourceIdentifier": "security-advisories@github.com",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-327"
              }
            ],
            "source": "security-advisories@github.com",
            "type": "Secondary"
          }
        ]
      }
    },
    "redhat_vex": {
      "current_release_date": "2025-05-28T21:33:12+00:00",
      "cve": "CVE-2024-21670",
      "id": "CVE-2024-21670",
      "initial_release_date": "2024-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "CL-Signatures Revocation Scheme in Ursa has flaws that allow a holder to demonstrate non-revocation of a revoked credential",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-21670.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "providerMetadata": {
              "dateUpdated": "2024-08-01T22:27:35.720Z",
              "orgId": "af854a3a-2127-422b-91ae-364da2661108",
              "shortName": "CVE"
            },
            "references": [
              {
                "name": "https://github.com/hyperledger-archives/ursa/security/advisories/GHSA-r78f-4q2q-hvv4",
                "tags": [
                  "x_refsource_CONFIRM",
                  "x_transferred"
                ],
                "url": "https://github.com/hyperledger-archives/ursa/security/advisories/GHSA-r78f-4q2q-hvv4"
              }
            ],
            "title": "CVE Program Container"
          },
          {
            "affected": [
              {
                "cpes": [
                  "cpe:2.3:a:hyperledger:ursa:*:*:*:*:*:*:*:*"
                ],
                "defaultStatus": "unknown",
                "product": "ursa",
                "vendor": "hyperledger",
                "versions": [
                  {
                    "lessThanOrEqual": "0.3.7",
                    "status": "affected",
                    "version": "0",
                    "versionType": "custom"
                  }
                ]
              }
            ],
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2024-21670",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2024-05-20T20:46:39.280934Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2024-04-23T18:57:15.412Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "product": "ursa",
              "vendor": "hyperledger-archives",
              "versions": [
                {
                  "status": "affected",
                  "version": "\u003c= 0.3.7"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "Ursa is a cryptographic library for use with blockchains. The revocation schema that is part of the Ursa CL-Signatures implementations has a flaw that could impact the privacy guarantees defined by the AnonCreds verifiable credential model, allowing a malicious holder of a revoked credential to generate a valid Non-Revocation Proof for that credential as part of an AnonCreds presentation. A verifier may verify a credential from a holder as being \"not revoked\" when in fact, the holder\u0027s credential has been revoked. Ursa has moved to end-of-life status and no fix is expected."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "attackComplexity": "HIGH",
                "attackVector": "PHYSICAL",
                "availabilityImpact": "NONE",
                "baseScore": 6.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "HIGH",
                "scope": "CHANGED",
                "userInteraction": "REQUIRED",
                "vectorString": "CVSS:3.1/AV:P/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:N",
                "version": "3.1"
              }
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-327",
                  "description": "CWE-327: Use of a Broken or Risky Cryptographic Algorithm",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2024-01-16T21:44:05.572Z",
            "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
            "shortName": "GitHub_M"
          },
          "references": [
            {
              "name": "https://github.com/hyperledger-archives/ursa/security/advisories/GHSA-r78f-4q2q-hvv4",
              "tags": [
                "x_refsource_CONFIRM"
              ],
              "url": "https://github.com/hyperledger-archives/ursa/security/advisories/GHSA-r78f-4q2q-hvv4"
            }
          ],
          "source": {
            "advisory": "GHSA-r78f-4q2q-hvv4",
            "discovery": "UNKNOWN"
          },
          "title": "CL-Signatures Revocation Scheme in Ursa has flaws that allow a holder to demonstrate non-revocation of a revoked credential"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "assignerShortName": "GitHub_M",
        "cveId": "CVE-2024-21670",
        "datePublished": "2024-01-16T21:44:05.572Z",
        "dateReserved": "2023-12-29T16:10:20.368Z",
        "dateUpdated": "2024-08-01T22:27:35.720Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}

FKIE_CVE-2024-21670

Vulnerability from fkie_nvd - Published: 2024-01-16 22:15 - Updated: 2026-06-17 07:09

Severity

6.5 (Medium) - CVSS:3.1/AV:P/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:N
8.1 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/hyperledger-archives/ursa/security/advisories/GHSA-r78f-4q2q-hvv4	Vendor Advisory
	af854a3a-2127-422b-91ae-364da2661108	https://github.com/hyperledger-archives/ursa/security/advisories/GHSA-r78f-4q2q-hvv4	Vendor Advisory

Impacted products

	Vendor	Product	Version
	hyperledger	ursa	0.1.0

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "ursa",
          "vendor": "hyperledger-archives",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c= 0.3.7"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    },
    {
      "affectedData": [
        {
          "cpes": [
            "cpe:2.3:a:hyperledger:ursa:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unknown",
          "product": "ursa",
          "vendor": "hyperledger",
          "versions": [
            {
              "lessThanOrEqual": "0.3.7",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:hyperledger:ursa:0.1.0:*:*:*:*:rust:*:*",
              "matchCriteriaId": "8997F554-6E18-4F21-B042-4954CD22436D",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Ursa is a cryptographic library for use with blockchains. The revocation schema that is part of the Ursa CL-Signatures implementations has a flaw that could impact the privacy guarantees defined by the AnonCreds verifiable credential model, allowing a malicious holder of a revoked credential to generate a valid Non-Revocation Proof for that credential as part of an AnonCreds presentation. A verifier may verify a credential from a holder as being \"not revoked\" when in fact, the holder\u0027s credential has been revoked. Ursa has moved to end-of-life status and no fix is expected."
    },
    {
      "lang": "es",
      "value": "Ursa es una librer\u00eda criptogr\u00e1fica para usar con blockchains. El esquema de revocaci\u00f3n que forma parte de las implementaciones de Ursa CL-Signatures tiene un fallo que podr\u00eda afectar las garant\u00edas de privacidad definidas por el modelo de credencial verificable de AnonCreds, permitiendo a un titular malicioso de una credencial revocada generar una prueba de no revocaci\u00f3n v\u00e1lida para esa credencial como parte de una presentaci\u00f3n de AnonCreds. Un verificador puede verificar que una credencial de un titular est\u00e1 \"not revoked\" cuando, en realidad, la credencial del titular ha sido revocada. Ursa ha pasado al estado de fin de vida \u00fatil y no se espera ninguna soluci\u00f3n."
    }
  ],
  "id": "CVE-2024-21670",
  "lastModified": "2026-06-17T07:09:57.713",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "PHYSICAL",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "HIGH",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:P/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 0.2,
        "impactScore": 5.8,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.1,
          "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:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2024-21670",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-05-20T20:46:39.280934Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2024-01-16T22:15:45.810",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://github.com/hyperledger-archives/ursa/security/advisories/GHSA-r78f-4q2q-hvv4"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://github.com/hyperledger-archives/ursa/security/advisories/GHSA-r78f-4q2q-hvv4"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-327"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-R78F-4Q2Q-HVV4

Vulnerability from github – Published: 2024-01-16 21:13 – Updated: 2024-01-19 19:28

Summary

CL-Signatures Revocation Scheme in Ursa has flaws that allow a holder to demonstrate non-revocation of a revoked credential

Details

Summary

The revocation schema that is part of the Ursa CL-Signatures implementations has a flaw that could impact the privacy guarantees defined by the AnonCreds verifiable credential model, allowing a malicious holder of a revoked credential to generate a valid Non-Revocation Proof for that credential as part of an AnonCreds presentation.

Details

The revocation schema that is part of the Ursa CL-Signatures implementation has a flaw that could impact the privacy guarantees defined by the AnonCreds verifiable credential model, allowing a malicious holder of a revoked credential to generate a valid Non-Revocation Proof for that credential as part of an AnonCreds presentation.

The flaw exists in all CL-Signature versions published from the Hyperledger Ursa repository to the Ursa Rust Crate, and are fixed in all versions published from the Hyperledger AnonCreds CL-Signatures repository to the AnonCreds CL-Signatures Rust Crate.

To exploit the flaw, a holder must update their wallet (agent) software, replacing the Hyperledger Ursa or AnonCreds CL-Signatures library that generates the proof of non-revocation. This may involve, for example, altering an iOS or Android application published in the respective app stores. A mitigation for this flaw is to use the application attestation capabilities (such as the Android "SafetyNet Attestation API") offered by the app store vendors to (for example) "help determine whether your servers are interacting with your genuine app running on a genuine Android device."

The problem is created in the generation of a revocation registry, prior to issuing any credentials. As such, to eliminate the impact of the flaw, the issued credentials must be re-issued based on a correct revocation registry, generated from a correct implementation, such as Hyperledger AnonCreds CL-Signatures.

Impact

The potential impact is as follows:

A verifier may verify a credential from a holder as being "not revoked" when in fact, the holder's credential has been revoked.

Mitigation

Upgrade libraries/applications using the Ursa Rust Crate to any version of the AnonCreds CL-Signatures Rust Crate. If your application has issued revocable credentials, once the Issuer library has been upgraded, new revocation registries must be created, and credentials issued from revocation registries created with the the flawed software must be revoked and reissued.

A verifier can detect if a holder presents a flawed revocable credential.

Severity

6.5 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "ursa"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "0.3.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c 0.1.0"
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "anoncreds-clsignatures"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2024-21670"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-327"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2024-01-16T21:13:43Z",
    "nvd_published_at": "2024-01-16T22:15:45Z",
    "severity": "MODERATE"
  },
  "details": "### Summary\n\nThe revocation schema that is part of the Ursa CL-Signatures implementations has a flaw that could impact the privacy guarantees defined by the AnonCreds verifiable credential model, allowing a malicious holder of a revoked credential to generate a valid Non-Revocation Proof for that credential as part of an AnonCreds presentation.\n\n### Details\n\nThe revocation schema that is part of the Ursa CL-Signatures implementation has a flaw that could impact the privacy guarantees defined by the AnonCreds verifiable credential model, allowing a malicious holder of a revoked credential to generate a valid Non-Revocation Proof for that credential as part of an AnonCreds presentation.\n\nThe flaw exists in all CL-Signature versions published from the [Hyperledger Ursa] repository to the [Ursa Rust Crate], and are fixed in all versions published from the [Hyperledger AnonCreds CL-Signatures] repository to the [AnonCreds CL-Signatures Rust Crate].\n\nTo exploit the flaw, a holder must update their wallet (agent) software, replacing the Hyperledger Ursa or AnonCreds CL-Signatures library that generates the proof of non-revocation. This may involve, for example, altering an iOS or Android application published in the respective app stores. A mitigation for this flaw is to use the application attestation capabilities (such as the Android \"[SafetyNet Attestation API]\") offered by the app store vendors to (for example) \"help determine whether your servers are interacting with your genuine app running on a genuine Android device.\"\n\nThe problem is created in the generation of a revocation registry, prior to issuing any credentials. As such, to eliminate the impact of the flaw, the issued credentials must be re-issued based on a correct revocation registry, generated from a correct implementation, such as [Hyperledger AnonCreds CL-Signatures].\n\n[Hyperledger Ursa]: https://github.com/hyperledger-archives/ursa\n[Ursa Rust Crate]: https://crates.io/crates/ursa\n[Hyperledger AnonCreds CL-Signatures]: https://github.com/hyperledger/anoncreds-clsignatures-rs\n[AnonCreds CL-Signatures Rust Crate]: https://crates.io/crates/anoncreds-clsignatures\n[SafetyNet Attestation API]: https://developer.android.com/privacy-and-security/safetynet/attestation\n### Impact\nThe potential impact is as follows:\n\n- A verifier may verify a credential from a holder as being \"not revoked\" when in fact, the holder\u0027s credential has been revoked.\n\n### Mitigation\n\nUpgrade libraries/applications using the [Ursa Rust Crate] to any version of the [AnonCreds CL-Signatures Rust Crate]. If your application has issued revocable credentials, once the Issuer library has been upgraded, new revocation registries must be created, and credentials issued from revocation registries created with the the flawed software must be revoked and reissued.\n\nA verifier can detect if a holder presents a flawed revocable credential.",
  "id": "GHSA-r78f-4q2q-hvv4",
  "modified": "2024-01-19T19:28:20Z",
  "published": "2024-01-16T21:13:43Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/hyperledger-archives/ursa/security/advisories/GHSA-r78f-4q2q-hvv4"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-21670"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/hyperledger-archives/ursa"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:P/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "CL-Signatures Revocation Scheme in Ursa has flaws that allow a holder to demonstrate non-revocation of a revoked credential"
}

GSD-2024-21670

Vulnerability from gsd - Updated: 2023-12-30 06:02

Details

Aliases

CVE-2024-21670

JSON

To clipboard

{
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2024-21670"
      ],
      "details": "Ursa is a cryptographic library for use with blockchains. The revocation schema that is part of the Ursa CL-Signatures implementations has a flaw that could impact the privacy guarantees defined by the AnonCreds verifiable credential model, allowing a malicious holder of a revoked credential to generate a valid Non-Revocation Proof for that credential as part of an AnonCreds presentation. A verifier may verify a credential from a holder as being \"not revoked\" when in fact, the holder\u0027s credential has been revoked. Ursa has moved to end-of-life status and no fix is expected.",
      "id": "GSD-2024-21670",
      "modified": "2023-12-30T06:02:17.549060Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "security-advisories@github.com",
        "ID": "CVE-2024-21670",
        "STATE": "PUBLIC"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "ursa",
                    "version": {
                      "version_data": [
                        {
                          "version_affected": "=",
                          "version_value": "\u003c= 0.3.7"
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "hyperledger-archives"
            }
          ]
        }
      },
      "data_format": "MITRE",
      "data_type": "CVE",
      "data_version": "4.0",
      "description": {
        "description_data": [
          {
            "lang": "eng",
            "value": "Ursa is a cryptographic library for use with blockchains. The revocation schema that is part of the Ursa CL-Signatures implementations has a flaw that could impact the privacy guarantees defined by the AnonCreds verifiable credential model, allowing a malicious holder of a revoked credential to generate a valid Non-Revocation Proof for that credential as part of an AnonCreds presentation. A verifier may verify a credential from a holder as being \"not revoked\" when in fact, the holder\u0027s credential has been revoked. Ursa has moved to end-of-life status and no fix is expected."
          }
        ]
      },
      "impact": {
        "cvss": [
          {
            "attackComplexity": "HIGH",
            "attackVector": "PHYSICAL",
            "availabilityImpact": "NONE",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "HIGH",
            "scope": "CHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:P/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:N",
            "version": "3.1"
          }
        ]
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "cweId": "CWE-327",
                "lang": "eng",
                "value": "CWE-327: Use of a Broken or Risky Cryptographic Algorithm"
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://github.com/hyperledger-archives/ursa/security/advisories/GHSA-r78f-4q2q-hvv4",
            "refsource": "MISC",
            "url": "https://github.com/hyperledger-archives/ursa/security/advisories/GHSA-r78f-4q2q-hvv4"
          }
        ]
      },
      "source": {
        "advisory": "GHSA-r78f-4q2q-hvv4",
        "discovery": "UNKNOWN"
      }
    },
    "nvd.nist.gov": {
      "cve": {
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:a:hyperledger:ursa:0.1.0:*:*:*:*:rust:*:*",
                    "matchCriteriaId": "8997F554-6E18-4F21-B042-4954CD22436D",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "descriptions": [
          {
            "lang": "en",
            "value": "Ursa is a cryptographic library for use with blockchains. The revocation schema that is part of the Ursa CL-Signatures implementations has a flaw that could impact the privacy guarantees defined by the AnonCreds verifiable credential model, allowing a malicious holder of a revoked credential to generate a valid Non-Revocation Proof for that credential as part of an AnonCreds presentation. A verifier may verify a credential from a holder as being \"not revoked\" when in fact, the holder\u0027s credential has been revoked. Ursa has moved to end-of-life status and no fix is expected."
          },
          {
            "lang": "es",
            "value": "Ursa es una librer\u00eda criptogr\u00e1fica para usar con blockchains. El esquema de revocaci\u00f3n que forma parte de las implementaciones de Ursa CL-Signatures tiene un fallo que podr\u00eda afectar las garant\u00edas de privacidad definidas por el modelo de credencial verificable de AnonCreds, permitiendo a un titular malicioso de una credencial revocada generar una prueba de no revocaci\u00f3n v\u00e1lida para esa credencial como parte de una presentaci\u00f3n de AnonCreds. Un verificador puede verificar que una credencial de un titular est\u00e1 \"not revoked\" cuando, en realidad, la credencial del titular ha sido revocada. Ursa ha pasado al estado de fin de vida \u00fatil y no se espera ninguna soluci\u00f3n."
          }
        ],
        "id": "CVE-2024-21670",
        "lastModified": "2024-01-24T18:14:10.497",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "HIGH",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 8.1,
                "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:H",
                "version": "3.1"
              },
              "exploitabilityScore": 2.2,
              "impactScore": 5.9,
              "source": "nvd@nist.gov",
              "type": "Primary"
            },
            {
              "cvssData": {
                "attackComplexity": "HIGH",
                "attackVector": "PHYSICAL",
                "availabilityImpact": "NONE",
                "baseScore": 6.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "HIGH",
                "scope": "CHANGED",
                "userInteraction": "REQUIRED",
                "vectorString": "CVSS:3.1/AV:P/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:N",
                "version": "3.1"
              },
              "exploitabilityScore": 0.2,
              "impactScore": 5.8,
              "source": "security-advisories@github.com",
              "type": "Secondary"
            }
          ]
        },
        "published": "2024-01-16T22:15:45.810",
        "references": [
          {
            "source": "security-advisories@github.com",
            "tags": [
              "Vendor Advisory"
            ],
            "url": "https://github.com/hyperledger-archives/ursa/security/advisories/GHSA-r78f-4q2q-hvv4"
          }
        ],
        "sourceIdentifier": "security-advisories@github.com",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-327"
              }
            ],
            "source": "security-advisories@github.com",
            "type": "Primary"
          }
        ]
      }
    }
  }
}

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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

Publication & reservation Sightings KEV catalogs Other timestamps

Loading timeline…

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

CVE-2024-21670 (GCVE-0-2024-21670)

FKIE_CVE-2024-21670

GHSA-R78F-4Q2Q-HVV4

Summary

Details

Impact

Mitigation

GSD-2024-21670

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour