CVE-2017-12635

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The JSON parser differences result in behaviour that if two 'roles' keys are available in the JSON, the second one will be used for authorising the document write, but the first 'roles' key is used for subsequent authorization for the newly created user. By design, users can not assign themselves roles. 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In combination with CVE-2017-12636 (Remote Code Execution), this can be used to give non-admin users access to arbitrary shell commands on the server as the database system user. The JSON parser differences result in behaviour that if two 'roles' keys are available in the JSON, the second one will be used for authorising the document write, but the first 'roles' key is used for subsequent authorization for the newly created user. By design, users can not assign themselves roles. 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{"affected": [{"affectedData": [{"product": "Apache CouchDB", "vendor": "Apache Software Foundation", "versions": [{"status": "affected", "version": "1.2.0 to 1.6.1"}, {"status": "affected", "version": "2.0.0 to 2.1.0"}]}], "source": "security@apache.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:apache:couchdb:*:*:*:*:*:*:*:*", "matchCriteriaId": "DCEE0A7F-2D9E-4B71-AB1D-F7E51FAF8839", "versionEndExcluding": "1.7.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:apache:couchdb:2.0.0:*:*:*:*:*:*:*", "matchCriteriaId": "7C28D397-7FB6-472F-A602-C2E7E4CCC7D9", "vulnerable": true}, {"criteria": "cpe:2.3:a:apache:couchdb:2.0.0:rc1:*:*:*:*:*:*", "matchCriteriaId": "20694545-A117-4327-9704-E4E9C26C0A10", "vulnerable": true}, {"criteria": "cpe:2.3:a:apache:couchdb:2.0.0:rc2:*:*:*:*:*:*", "matchCriteriaId": "53337458-D551-42E3-825D-1E94AB8409D3", "vulnerable": true}, {"criteria": "cpe:2.3:a:apache:couchdb:2.0.0:rc3:*:*:*:*:*:*", "matchCriteriaId": "C6848350-0CDC-4CB1-B6DB-1A47227F10AF", "vulnerable": true}, {"criteria": "cpe:2.3:a:apache:couchdb:2.0.0:rc4:*:*:*:*:*:*", "matchCriteriaId": "2A820A52-9170-4E32-B224-1C9E7F48A6D2", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Due to differences in the Erlang-based JSON parser and JavaScript-based JSON parser, it is possible in Apache CouchDB before 1.7.0 and 2.x before 2.1.1 to submit _users documents with duplicate keys for 'roles' used for access control within the database, including the special case '_admin' role, that denotes administrative users. In combination with CVE-2017-12636 (Remote Code Execution), this can be used to give non-admin users access to arbitrary shell commands on the server as the database system user. The JSON parser differences result in behaviour that if two 'roles' keys are available in the JSON, the second one will be used for authorising the document write, but the first 'roles' key is used for subsequent authorization for the newly created user. By design, users can not assign themselves roles. The vulnerability allows non-admin users to give themselves admin privileges."}, {"lang": "es", "value": "Debido a las diferencias en el analizador sint\u00e1ctico de JSON basado en Erlang y el el analizador sint\u00e1ctico de JSON basado en JavaScript, es posible que, en versiones anteriores a la 1.7.0 y en las versiones 2.x anteriores a la 2.1.1 de Apache CouchDB, se puedan enviar documentos _users con claves duplicadas para \"roles\" empleados para el control de acceso en la base de datos, incluyendo el caso especial del rol \"_admin\", que denota a los usuarios administrativos. Esto puede utilizarse conjuntamente con CVE-2017-12636 (ejecuci\u00f3n remota de c\u00f3digo) para dar acceso a usuarios no administradores a comandos shell arbitrarios en el servidor como el usuario del sistema de la base de datos. Las diferencias entre analizadores sint\u00e1cticos de JSON resultan en un comportamiento por el cual, si dos claves \"roles\" est\u00e1n disponibles en el JSON, la segunda se emplear\u00e1 para autorizar la escritura del documento, pero la primera clave \"roles\" se emplea para la subsecuente autorizaci\u00f3n para el usuario recientemente creado. Por dise\u00f1o, los usuarios no pueden asignase roles a s\u00ed mismos. La vulnerabilidad permite que usuarios no administradores se autoasignen privilegios de administrador."}], "id": "CVE-2017-12635", "lastModified": "2026-06-17T01:03:42.587", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "HIGH", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "COMPLETE", "baseScore": 10.0, "confidentialityImpact": "COMPLETE", "integrityImpact": "COMPLETE", "vectorString": "AV:N/AC:L/Au:N/C:C/I:C/A:C", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 10.0, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV30": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.0"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2017-11-14T20:29:00.200", "references": [{"source": "security@apache.org", "tags": ["Third Party Advisory", "VDB Entry"], "url": "http://www.securityfocus.com/bid/101868"}, {"source": "security@apache.org", "url": "https://lists.apache.org/thread.html/6c405bf3f8358e6314076be9f48c89a2e0ddf00539906291ebdf0c67%40%3Cdev.couchdb.apache.org%3E"}, {"source": "security@apache.org", "url": "https://lists.debian.org/debian-lts-announce/2018/01/msg00026.html"}, {"source": "security@apache.org", "tags": ["Third Party Advisory"], "url": "https://security.gentoo.org/glsa/201711-16"}, {"source": "security@apache.org", "url": "https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbmu03935en_us"}, {"source": "security@apache.org", "url": "https://www.exploit-db.com/exploits/44498/"}, {"source": "security@apache.org", "url": "https://www.exploit-db.com/exploits/45019/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory", "VDB Entry"], "url": "http://www.securityfocus.com/bid/101868"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.apache.org/thread.html/6c405bf3f8358e6314076be9f48c89a2e0ddf00539906291ebdf0c67%40%3Cdev.couchdb.apache.org%3E"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2018/01/msg00026.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://security.gentoo.org/glsa/201711-16"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbmu03935en_us"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://www.exploit-db.com/exploits/44498/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://www.exploit-db.com/exploits/45019/"}], "sourceIdentifier": "security@apache.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-269"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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