CVE-2020-7787

{"id": "CVE-2020-7787", "metrics": {"cvssMetricV2": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"version": "2.0", "baseScore": 5.0, "accessVector": "NETWORK", "vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:N", "authentication": "NONE", "integrityImpact": "PARTIAL", "accessComplexity": "LOW", "availabilityImpact": "NONE", "confidentialityImpact": "NONE"}, "acInsufInfo": false, "impactScore": 2.9, "baseSeverity": "MEDIUM", "obtainAllPrivilege": false, "exploitabilityScore": 10.0, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}], "cvssMetricV31": [{"type": "Primary", "source": "report@snyk.io", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.2, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 4.2, "exploitabilityScore": 3.9}]}, "published": "2020-12-09T17:15:32.027", "references": [{"url": "https://github.com/salvoravida/react-adal/pull/115", "tags": ["Exploit", "Third Party Advisory"], "source": "report@snyk.io"}, {"url": "https://snyk.io/vuln/SNYK-JS-REACTADAL-1018907", "tags": ["Exploit", "Third Party Advisory"], "source": "report@snyk.io"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-287"}]}], "descriptions": [{"lang": "en", "value": "This affects all versions of package react-adal. It is possible for a specially crafted JWT token and request URL can cause the nonce, session and refresh values to be incorrectly validated, causing the application to treat an attacker-generated JWT token as authentic. The logical defect is caused by how the nonce, session and refresh values are stored in the browser local storage or session storage. Each key is automatically appended by ||. When the received nonce and session keys are generated, the list of values is stored in the browser storage, separated by ||, with || always appended to the end of the list. Since || will always be the last 2 characters of the stored values, an empty string (\"\") will always be in the list of the valid values. Therefore, if an empty session parameter is provided in the callback URL, and a specially-crafted JWT token contains an nonce value of \"\" (empty string), then adal.js will consider the JWT token as authentic."}, {"lang": "es", "value": "Esto afecta a todas las versiones del paquete react-adal. Es posible que un token JWT especialmente dise\u00f1ado y una URL de petici\u00f3n puedan hacer que los valores de nonce, session y refresh sean validados incorrectamente, causando que la aplicaci\u00f3n trate un token JWT generado por un atacante como aut\u00e9ntico. El defecto l\u00f3gico es causado por c\u00f3mo se almacenan los valores de nonce, session y refresh en el almacenamiento local del navegador o en el almacenamiento de sesiones. Cada clave se agrega autom\u00e1ticamente mediante ||. Cuando las claves de session y nonce recibidas son generadas, la lista de valores se almacena en el almacenamiento del navegador, separados por ||, con || siempre se a\u00f1ade al final de la lista. A partir de || siempre ser\u00e1n los 2 \u00faltimos caracteres de los valores almacenados, una cadena vac\u00eda (\"\") siempre estar\u00e1 en la lista de valores v\u00e1lidos. Por lo tanto, si se proporciona un par\u00e1metro de sesi\u00f3n vac\u00edo en la URL de devoluci\u00f3n de llamada y un token JWT especialmente dise\u00f1ado contiene un valor nonce de \"\" (cadena vac\u00eda), entonces adal.js considerar\u00e1 el token JWT como aut\u00e9ntico"}], "lastModified": "2020-12-11T17:01:29.677", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:react-adal_project:react-adal:*:*:*:*:*:node.js:*:*", "vulnerable": true, "matchCriteriaId": "2602EEBD-BA01-4E30-AC0A-953689A9C2AB"}], "operator": "OR"}]}], "sourceIdentifier": "report@snyk.io"}