CVE-2023-49803

{"id": "CVE-2023-49803", "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}, {"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 8.6, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 4.0, "exploitabilityScore": 3.9}]}, "published": "2023-12-11T23:15:07.620", "references": [{"url": "https://github.com/koajs/cors/commit/f31dac99f5355c41e7d4dd3c4a80c5f154941a11", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/koajs/cors/security/advisories/GHSA-qxrj-hx23-xp82", "tags": ["Vendor Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-346"}]}, {"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-346"}]}], "descriptions": [{"lang": "en", "value": "@koa/cors npm provides Cross-Origin Resource Sharing (CORS) for koa, a web framework for Node.js. Prior to version 5.0.0, the middleware operates in a way that if an allowed origin is not provided, it will return an `Access-Control-Allow-Origin` header with the value of the origin from the request. This behavior completely disables one of the most crucial elements of browsers - the Same Origin Policy (SOP), this could cause a very serious security threat to the users of this middleware. If such behavior is expected, for instance, when middleware is used exclusively for prototypes and not for production applications, it should be heavily emphasized in the documentation along with an indication of the risks associated with such behavior, as many users may not be aware of it. Version 5.0.0 fixes this vulnerability."}, {"lang": "es", "value": "@koa/cors npm proporciona Cross-Origin Resource Sharing (CORS) para koa, un framework web para Node.js. Antes de la versi\u00f3n 5.0.0, el middleware funciona de manera que si no se proporciona un origen permitido, devolver\u00e1 un encabezado \"Access-Control-Allow-Origin\" con el valor del origen de la solicitud. Este comportamiento desactiva por completo uno de los elementos m\u00e1s importantes de los navegadores: la Pol\u00edtica del Mismo Origen (SOP), lo que podr\u00eda causar una amenaza de seguridad muy grave para los usuarios de este middleware. Si se espera tal comportamiento, por ejemplo, cuando el middleware se utiliza exclusivamente para prototipos y no para aplicaciones de producci\u00f3n, se debe enfatizar mucho en la documentaci\u00f3n junto con una indicaci\u00f3n de los riesgos asociados con dicho comportamiento, ya que es posible que muchos usuarios no lo sepan. La versi\u00f3n 5.0.0 corrige esta vulnerabilidad."}], "lastModified": "2023-12-14T20:03:24.677", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:koajs:cross-origin_resource_sharing_for_koa:*:*:*:*:*:node.js:*:*", "vulnerable": true, "matchCriteriaId": "6F956DDB-4F42-4714-B81A-29394B3F5E3B", "versionEndExcluding": "5.0.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}