GSD-2020-24722

Vulnerability from gsd - Updated: 2023-12-13 01:22
Details
** DISPUTED ** An issue was discovered in the GAEN (aka Google/Apple Exposure Notifications) protocol through 2020-10-05, as used in COVID-19 applications on Android and iOS. The encrypted metadata block with a TX value lacks a checksum, allowing bitflipping to amplify a contamination attack. This can cause metadata deanonymization and risk-score inflation. NOTE: the vendor's position is "We do not believe that TX power authentication would be a useful defense against relay attacks."
Aliases
Aliases
CVE-2020-24722
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{
  "GSD": {
    "alias": "CVE-2020-24722",
    "description": "** DISPUTED ** An issue was discovered in the GAEN (aka Google/Apple Exposure Notifications) protocol through 2020-10-05, as used in COVID-19 applications on Android and iOS. The encrypted metadata block with a TX value lacks a checksum, allowing bitflipping to amplify a contamination attack. This can cause metadata deanonymization and risk-score inflation. NOTE: the vendor\u0027s position is \"We do not believe that TX power authentication would be a useful defense against relay attacks.\"",
    "id": "GSD-2020-24722"
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2020-24722"
      ],
      "details": "** DISPUTED ** An issue was discovered in the GAEN (aka Google/Apple Exposure Notifications) protocol through 2020-10-05, as used in COVID-19 applications on Android and iOS. The encrypted metadata block with a TX value lacks a checksum, allowing bitflipping to amplify a contamination attack. This can cause metadata deanonymization and risk-score inflation. NOTE: the vendor\u0027s position is \"We do not believe that TX power authentication would be a useful defense against relay attacks.\"",
      "id": "GSD-2020-24722",
      "modified": "2023-12-13T01:22:12.752473Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
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      "CVE_data_meta": {
        "ASSIGNER": "cve@mitre.org",
        "ID": "CVE-2020-24722",
        "STATE": "PUBLIC"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
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              "product": {
                "product_data": [
                  {
                    "product_name": "n/a",
                    "version": {
                      "version_data": [
                        {
                          "version_value": "n/a"
                        }
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              "vendor_name": "n/a"
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      "data_type": "CVE",
      "data_version": "4.0",
      "description": {
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          {
            "lang": "eng",
            "value": "** DISPUTED ** An issue was discovered in the GAEN (aka Google/Apple Exposure Notifications) protocol through 2020-10-05, as used in COVID-19 applications on Android and iOS. The encrypted metadata block with a TX value lacks a checksum, allowing bitflipping to amplify a contamination attack. This can cause metadata deanonymization and risk-score inflation. NOTE: the vendor\u0027s position is \"We do not believe that TX power authentication would be a useful defense against relay attacks.\""
          }
        ]
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "lang": "eng",
                "value": "n/a"
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      },
      "references": {
        "reference_data": [
          {
            "name": "https://blog.google/inside-google/company-announcements/update-exposure-notifications",
            "refsource": "MISC",
            "url": "https://blog.google/inside-google/company-announcements/update-exposure-notifications"
          },
          {
            "name": "http://seclists.org/fulldisclosure/2020/Oct/12",
            "refsource": "MISC",
            "url": "http://seclists.org/fulldisclosure/2020/Oct/12"
          },
          {
            "name": "https://github.com/google/exposure-notifications-internals/blob/main/en-risks-and-mitigations-faq.md#additional-considerations",
            "refsource": "MISC",
            "url": "https://github.com/google/exposure-notifications-internals/blob/main/en-risks-and-mitigations-faq.md#additional-considerations"
          },
          {
            "name": "http://packetstormsecurity.com/files/159496/GAEN-Protocol-Metadata-Deanonymization-Risk-Score-Inflation.html",
            "refsource": "MISC",
            "url": "http://packetstormsecurity.com/files/159496/GAEN-Protocol-Metadata-Deanonymization-Risk-Score-Inflation.html"
          }
        ]
      }
    },
    "nvd.nist.gov": {
      "cve": {
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:a:exposure_notifications_project:exposure_notifications:*:*:*:*:*:android:*:*",
                    "matchCriteriaId": "59CFB73A-D00F-4527-BC13-DA45DE5F7175",
                    "versionEndIncluding": "2020-10-05",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:a:exposure_notifications_project:exposure_notifications:*:*:*:*:*:iphone_os:*:*",
                    "matchCriteriaId": "232A4EE9-1F2B-4672-BEA7-1663E87F6A0B",
                    "versionEndIncluding": "2020-10-05",
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                ],
                "negate": false,
                "operator": "OR"
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        ],
        "descriptions": [
          {
            "lang": "en",
            "value": "An issue was discovered in the GAEN (aka Google/Apple Exposure Notifications) protocol through 2020-10-05, as used in COVID-19 applications on Android and iOS. The encrypted metadata block with a TX value lacks a checksum, allowing bitflipping to amplify a contamination attack. This can cause metadata deanonymization and risk-score inflation. NOTE: the vendor\u0027s position is \"We do not believe that TX power authentication would be a useful defense against relay attacks."
          },
          {
            "lang": "es",
            "value": "**EN DISPUTA** Se detect\u00f3 un problema en el protocolo GAEN (tambi\u00e9n se conoce como Google/Apple Exposure Notifications) hasta el 05/10/2020, tal como es usado en las aplicaciones COVID-19 en Android e iOS.\u0026#xa0;El bloque de metadatos cifrados con un valor TX carece de un checksum, permitiendo a bitflipping amplificar un ataque de contaminaci\u00f3n.\u0026#xa0;Esto puede causar una desanonimizaci\u00f3n de los metadatos y la inflaci\u00f3n de la puntuaci\u00f3n de riesgo.\u0026#xa0;NOTA: la posici\u00f3n del proveedor es \"No creemos que la autenticaci\u00f3n de energ\u00eda TX sea una defensa \u00fatil contra los ataques de retransmisi\u00f3n\""
          }
        ],
        "id": "CVE-2020-24722",
        "lastModified": "2024-04-11T01:07:56.633",
        "metrics": {
          "cvssMetricV2": [
            {
              "acInsufInfo": false,
              "baseSeverity": "LOW",
              "cvssData": {
                "accessComplexity": "HIGH",
                "accessVector": "NETWORK",
                "authentication": "NONE",
                "availabilityImpact": "NONE",
                "baseScore": 2.6,
                "confidentialityImpact": "NONE",
                "integrityImpact": "PARTIAL",
                "vectorString": "AV:N/AC:H/Au:N/C:N/I:P/A:N",
                "version": "2.0"
              },
              "exploitabilityScore": 4.9,
              "impactScore": 2.9,
              "obtainAllPrivilege": false,
              "obtainOtherPrivilege": false,
              "obtainUserPrivilege": false,
              "source": "nvd@nist.gov",
              "type": "Primary",
              "userInteractionRequired": false
            }
          ],
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "HIGH",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 5.9,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
                "version": "3.1"
              },
              "exploitabilityScore": 2.2,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2020-10-07T15:15:12.553",
        "references": [
          {
            "source": "cve@mitre.org",
            "tags": [
              "Exploit",
              "Third Party Advisory",
              "VDB Entry"
            ],
            "url": "http://packetstormsecurity.com/files/159496/GAEN-Protocol-Metadata-Deanonymization-Risk-Score-Inflation.html"
          },
          {
            "source": "cve@mitre.org",
            "tags": [
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              "Mailing List",
              "Third Party Advisory"
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            "url": "http://seclists.org/fulldisclosure/2020/Oct/12"
          },
          {
            "source": "cve@mitre.org",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://blog.google/inside-google/company-announcements/update-exposure-notifications"
          },
          {
            "source": "cve@mitre.org",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://github.com/google/exposure-notifications-internals/blob/main/en-risks-and-mitigations-faq.md#additional-considerations"
          }
        ],
        "sourceIdentifier": "cve@mitre.org",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-294"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    }
  }
}



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