CVE-2020-24722

{"id": "CVE-2020-24722", "metrics": {"cvssMetricV2": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"version": "2.0", "baseScore": 2.6, "accessVector": "NETWORK", "vectorString": "AV:N/AC:H/Au:N/C:N/I:P/A:N", "authentication": "NONE", "integrityImpact": "PARTIAL", "accessComplexity": "HIGH", "availabilityImpact": "NONE", "confidentialityImpact": "NONE"}, "acInsufInfo": false, "impactScore": 2.9, "baseSeverity": "LOW", "obtainAllPrivilege": false, "exploitabilityScore": 4.9, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.9, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 2.2}]}, "published": "2020-10-07T15:15:12.553", "references": [{"url": "http://packetstormsecurity.com/files/159496/GAEN-Protocol-Metadata-Deanonymization-Risk-Score-Inflation.html", "tags": ["Exploit", "Third Party Advisory", "VDB Entry"], "source": "cve@mitre.org"}, {"url": "http://seclists.org/fulldisclosure/2020/Oct/12", "tags": ["Exploit", "Mailing List", "Third Party Advisory"], "source": "cve@mitre.org"}, {"url": "https://blog.google/inside-google/company-announcements/update-exposure-notifications", "tags": ["Third Party Advisory"], "source": "cve@mitre.org"}, {"url": "https://github.com/google/exposure-notifications-internals/blob/main/en-risks-and-mitigations-faq.md#additional-considerations", "tags": ["Third Party Advisory"], "source": "cve@mitre.org"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-294"}]}], "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's 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. El bloque de metadatos cifrados con un valor TX carece de un checksum, permitiendo a bitflipping amplificar un ataque de contaminaci\u00f3n. Esto puede causar una desanonimizaci\u00f3n de los metadatos y la inflaci\u00f3n de la puntuaci\u00f3n de riesgo. 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\""}], "lastModified": "2024-04-11T01:07:56.633", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:exposure_notifications_project:exposure_notifications:*:*:*:*:*:android:*:*", "vulnerable": true, "matchCriteriaId": "59CFB73A-D00F-4527-BC13-DA45DE5F7175", "versionEndIncluding": "2020-10-05"}, {"criteria": "cpe:2.3:a:exposure_notifications_project:exposure_notifications:*:*:*:*:*:iphone_os:*:*", "vulnerable": true, "matchCriteriaId": "232A4EE9-1F2B-4672-BEA7-1663E87F6A0B", "versionEndIncluding": "2020-10-05"}], "operator": "OR"}]}], "sourceIdentifier": "cve@mitre.org"}