CVE-2016-4028

{"id": "CVE-2016-4028", "metrics": {"cvssMetricV2": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"version": "2.0", "baseScore": 3.5, "accessVector": "NETWORK", "vectorString": "AV:N/AC:M/Au:S/C:P/I:N/A:N", "authentication": "SINGLE", "integrityImpact": "NONE", "accessComplexity": "MEDIUM", "availabilityImpact": "NONE", "confidentialityImpact": "PARTIAL"}, "acInsufInfo": false, "impactScore": 2.9, "baseSeverity": "LOW", "obtainAllPrivilege": false, "exploitabilityScore": 6.8, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}], "cvssMetricV30": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.0", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.6}]}, "published": "2016-12-15T06:59:07.457", "references": [{"url": "http://www.securityfocus.com/archive/1/538732/100/0/threaded", "source": "cve@mitre.org"}, {"url": "http://www.securitytracker.com/id/1036154", "tags": ["Third Party Advisory", "VDB Entry"], "source": "cve@mitre.org"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-255"}]}], "descriptions": [{"lang": "en", "value": "An issue was discovered in Open-Xchange OX Guard before 2.4.0-rev8. OX Guard uses an authentication token to identify and transfer guest users' credentials. The OX Guard API acts as a padding oracle by responding with different error codes depending on whether the provided token matches the encryption padding. In combination with AES-CBC, this allows attackers to guess the correct padding. Attackers may run brute-forcing attacks on the content of the guest authentication token and discover user credentials. For a practical attack vector, the guest users needs to have logged in, the content of the guest user's \"OxReaderID\" cookie and the value of the \"auth\" parameter needs to be known to the attacker."}, {"lang": "es", "value": "Se descubri\u00f3 un problema en OX Guard de Open-Xchange anterior a versi\u00f3n 2.4.0-rev8. OX Guard utiliza un token de autenticaci\u00f3n para identificar y transferir las credenciales de usuarios invitados. La API de OX Guard act\u00faa como un or\u00e1culo de relleno (padding oracle) al responder con diferentes c\u00f3digos de error dependiendo de si el token provisto coincide con el cifrado de relleno (encryption padding). En combinaci\u00f3n con AES-CBC, esto permite a los atacantes adivinar el relleno correcto. Los atacantes pueden ejecutar ataques violentos en el contenido del token de autenticaci\u00f3n del invitado y detectar las credenciales del usuario. Para un vector de ataque pr\u00e1ctico, los usuarios invitados necesitan haber iniciado sesi\u00f3n, el contenido de la cookie \"OxReaderID\" del usuario invitado y el valor del par\u00e1metro \"auth\" deben ser conocidos por el atacante."}], "lastModified": "2018-10-19T15:46:30.773", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:open-xchange:ox_guard:*:rev7:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "C53D52F6-DBFF-4FCF-9EB7-B7537A32EFD5", "versionEndIncluding": "2.4.0"}], "operator": "OR"}]}], "sourceIdentifier": "cve@mitre.org"}