gsd-2021-32677
Vulnerability from gsd
Modified
2023-12-13 01:23
Details
FastAPI is a web framework for building APIs with Python 3.6+ based on standard Python type hints. FastAPI versions lower than 0.65.2 that used cookies for authentication in path operations that received JSON payloads sent by browsers were vulnerable to a Cross-Site Request Forgery (CSRF) attack. In versions lower than 0.65.2, FastAPI would try to read the request payload as JSON even if the content-type header sent was not set to application/json or a compatible JSON media type (e.g. application/geo+json). A request with a content type of text/plain containing JSON data would be accepted and the JSON data would be extracted. Requests with content type text/plain are exempt from CORS preflights, for being considered Simple requests. The browser will execute them right away including cookies, and the text content could be a JSON string that would be parsed and accepted by the FastAPI application. This is fixed in FastAPI 0.65.2. The request data is now parsed as JSON only if the content-type header is application/json or another JSON compatible media type like application/geo+json. It's best to upgrade to the latest FastAPI, but if updating is not possible then a middleware or a dependency that checks the content-type header and aborts the request if it is not application/json or another JSON compatible content type can act as a mitigating workaround.
Aliases
Aliases
CVE-2021-32677


To clipboard 

{
   GSD: {
      alias: "CVE-2021-32677",
      description: "FastAPI is a web framework for building APIs with Python 3.6+ based on standard Python type hints. FastAPI versions lower than 0.65.2 that used cookies for authentication in path operations that received JSON payloads sent by browsers were vulnerable to a Cross-Site Request Forgery (CSRF) attack. In versions lower than 0.65.2, FastAPI would try to read the request payload as JSON even if the content-type header sent was not set to application/json or a compatible JSON media type (e.g. application/geo+json). A request with a content type of text/plain containing JSON data would be accepted and the JSON data would be extracted. Requests with content type text/plain are exempt from CORS preflights, for being considered Simple requests. The browser will execute them right away including cookies, and the text content could be a JSON string that would be parsed and accepted by the FastAPI application. This is fixed in FastAPI 0.65.2. The request data is now parsed as JSON only if the content-type header is application/json or another JSON compatible media type like application/geo+json. It's best to upgrade to the latest FastAPI, but if updating is not possible then a middleware or a dependency that checks the content-type header and aborts the request if it is not application/json or another JSON compatible content type can act as a mitigating workaround.",
      id: "GSD-2021-32677",
      references: [
         "https://security.archlinux.org/CVE-2021-32677",
      ],
   },
   gsd: {
      metadata: {
         exploitCode: "unknown",
         remediation: "unknown",
         reportConfidence: "confirmed",
         type: "vulnerability",
      },
      osvSchema: {
         aliases: [
            "CVE-2021-32677",
         ],
         details: "FastAPI is a web framework for building APIs with Python 3.6+ based on standard Python type hints. FastAPI versions lower than 0.65.2 that used cookies for authentication in path operations that received JSON payloads sent by browsers were vulnerable to a Cross-Site Request Forgery (CSRF) attack. In versions lower than 0.65.2, FastAPI would try to read the request payload as JSON even if the content-type header sent was not set to application/json or a compatible JSON media type (e.g. application/geo+json). A request with a content type of text/plain containing JSON data would be accepted and the JSON data would be extracted. Requests with content type text/plain are exempt from CORS preflights, for being considered Simple requests. The browser will execute them right away including cookies, and the text content could be a JSON string that would be parsed and accepted by the FastAPI application. This is fixed in FastAPI 0.65.2. The request data is now parsed as JSON only if the content-type header is application/json or another JSON compatible media type like application/geo+json. It's best to upgrade to the latest FastAPI, but if updating is not possible then a middleware or a dependency that checks the content-type header and aborts the request if it is not application/json or another JSON compatible content type can act as a mitigating workaround.",
         id: "GSD-2021-32677",
         modified: "2023-12-13T01:23:09.152968Z",
         schema_version: "1.4.0",
      },
   },
   namespaces: {
      "cve.org": {
         CVE_data_meta: {
            ASSIGNER: "security-advisories@github.com",
            ID: "CVE-2021-32677",
            STATE: "PUBLIC",
            TITLE: "Cross-Site Request Forgery (CSRF) in FastAPI",
         },
         affects: {
            vendor: {
               vendor_data: [
                  {
                     product: {
                        product_data: [
                           {
                              product_name: "fastapi",
                              version: {
                                 version_data: [
                                    {
                                       version_value: "< 0.65.2",
                                    },
                                 ],
                              },
                           },
                        ],
                     },
                     vendor_name: "tiangolo",
                  },
               ],
            },
         },
         data_format: "MITRE",
         data_type: "CVE",
         data_version: "4.0",
         description: {
            description_data: [
               {
                  lang: "eng",
                  value: "FastAPI is a web framework for building APIs with Python 3.6+ based on standard Python type hints. FastAPI versions lower than 0.65.2 that used cookies for authentication in path operations that received JSON payloads sent by browsers were vulnerable to a Cross-Site Request Forgery (CSRF) attack. In versions lower than 0.65.2, FastAPI would try to read the request payload as JSON even if the content-type header sent was not set to application/json or a compatible JSON media type (e.g. application/geo+json). A request with a content type of text/plain containing JSON data would be accepted and the JSON data would be extracted. Requests with content type text/plain are exempt from CORS preflights, for being considered Simple requests. The browser will execute them right away including cookies, and the text content could be a JSON string that would be parsed and accepted by the FastAPI application. This is fixed in FastAPI 0.65.2. The request data is now parsed as JSON only if the content-type header is application/json or another JSON compatible media type like application/geo+json. It's best to upgrade to the latest FastAPI, but if updating is not possible then a middleware or a dependency that checks the content-type header and aborts the request if it is not application/json or another JSON compatible content type can act as a mitigating workaround.",
               },
            ],
         },
         impact: {
            cvss: {
               attackComplexity: "LOW",
               attackVector: "NETWORK",
               availabilityImpact: "NONE",
               baseScore: 8.2,
               baseSeverity: "HIGH",
               confidentialityImpact: "LOW",
               integrityImpact: "HIGH",
               privilegesRequired: "NONE",
               scope: "UNCHANGED",
               userInteraction: "NONE",
               vectorString: "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N",
               version: "3.1",
            },
         },
         problemtype: {
            problemtype_data: [
               {
                  description: [
                     {
                        lang: "eng",
                        value: "CWE-352: Cross-Site Request Forgery (CSRF)",
                     },
                  ],
               },
            ],
         },
         references: {
            reference_data: [
               {
                  name: "https://github.com/tiangolo/fastapi/security/advisories/GHSA-8h2j-cgx8-6xv7",
                  refsource: "CONFIRM",
                  url: "https://github.com/tiangolo/fastapi/security/advisories/GHSA-8h2j-cgx8-6xv7",
               },
               {
                  name: "https://github.com/tiangolo/fastapi/commit/fa7e3c996edf2d5482fff8f9d890ac2390dede4d",
                  refsource: "MISC",
                  url: "https://github.com/tiangolo/fastapi/commit/fa7e3c996edf2d5482fff8f9d890ac2390dede4d",
               },
               {
                  name: "FEDORA-2021-917e89c036",
                  refsource: "FEDORA",
                  url: "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MATAWX25TYKNEKLDMKWNLYDB34UWTROA/",
               },
            ],
         },
         source: {
            advisory: "GHSA-8h2j-cgx8-6xv7",
            discovery: "UNKNOWN",
         },
      },
      "gitlab.com": {
         advisories: [
            {
               affected_range: "<0.65.2",
               affected_versions: "All versions before 0.65.2",
               cvss_v2: "AV:N/AC:M/Au:N/C:P/I:P/A:N",
               cvss_v3: "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N",
               cwe_ids: [
                  "CWE-1035",
                  "CWE-352",
                  "CWE-937",
               ],
               date: "2021-06-24",
               description: "FastAPI is a web framework for building APIs with Python The request data is now parsed as JSON only if the content-type header is application/json or another JSON compatible media type like application/geo+json. It's best to upgrade to the latest FastAPI, but if updating is not possible then a middleware or a dependency that checks the content-type header and aborts the request if it is not application/json or another JSON compatible content type can act as a mitigating workaround.",
               fixed_versions: [
                  "0.65.2",
               ],
               identifier: "CVE-2021-32677",
               identifiers: [
                  "CVE-2021-32677",
                  "GHSA-8h2j-cgx8-6xv7",
               ],
               not_impacted: "All versions starting from 0.65.2",
               package_slug: "pypi/fastapi",
               pubdate: "2021-06-09",
               solution: "Upgrade to version 0.65.2 or above.",
               title: "Cross-Site Request Forgery (CSRF)",
               urls: [
                  "https://nvd.nist.gov/vuln/detail/CVE-2021-32677",
               ],
               uuid: "ac8ca397-b7de-406c-8fb9-a2e0aed6c3be",
            },
         ],
      },
      "nvd.nist.gov": {
         cve: {
            configurations: [
               {
                  nodes: [
                     {
                        cpeMatch: [
                           {
                              criteria: "cpe:2.3:a:tiangolo:fastapi:*:*:*:*:*:*:*:*",
                              matchCriteriaId: "60506886-D0E8-4F9C-B900-D373A4435A4D",
                              versionEndExcluding: "0.65.2",
                              vulnerable: true,
                           },
                        ],
                        negate: false,
                        operator: "OR",
                     },
                  ],
               },
               {
                  nodes: [
                     {
                        cpeMatch: [
                           {
                              criteria: "cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*",
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                              vulnerable: true,
                           },
                        ],
                        negate: false,
                        operator: "OR",
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                  ],
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            ],
            descriptions: [
               {
                  lang: "en",
                  value: "FastAPI is a web framework for building APIs with Python 3.6+ based on standard Python type hints. FastAPI versions lower than 0.65.2 that used cookies for authentication in path operations that received JSON payloads sent by browsers were vulnerable to a Cross-Site Request Forgery (CSRF) attack. In versions lower than 0.65.2, FastAPI would try to read the request payload as JSON even if the content-type header sent was not set to application/json or a compatible JSON media type (e.g. application/geo+json). A request with a content type of text/plain containing JSON data would be accepted and the JSON data would be extracted. Requests with content type text/plain are exempt from CORS preflights, for being considered Simple requests. The browser will execute them right away including cookies, and the text content could be a JSON string that would be parsed and accepted by the FastAPI application. This is fixed in FastAPI 0.65.2. The request data is now parsed as JSON only if the content-type header is application/json or another JSON compatible media type like application/geo+json. It's best to upgrade to the latest FastAPI, but if updating is not possible then a middleware or a dependency that checks the content-type header and aborts the request if it is not application/json or another JSON compatible content type can act as a mitigating workaround.",
               },
               {
                  lang: "es",
                  value: "FastAPI es un framework web para construir APIs con Python versión 3.6+ basado en sugerencias de tipo estándar de Python. Las versiones de FastAPI inferiores a la 0.65.2 que usaban cookies para la autenticación en las operaciones de ruta que recibían cargas útiles JSON enviadas por los navegadores eran vulnerables a un ataque de tipo Cross-Site Request Forgery (CSRF). En versiones inferiores a la 0.65.2, FastAPI intentaba leer la carga útil de la petición como JSON incluso si la encabezado content-type enviada no estaba configurada como application/json o un tipo de medio JSON compatible (por ejemplo, application/geo+json). Una petición con un tipo de contenido text/plain que contenga datos JSON será aceptada y los datos JSON serán extraídos. Las peticiones con tipo de contenido text/plain están exentas de preflights CORS, por ser consideradas peticiones simples. El navegador las ejecutará de inmediato, incluyendo las cookies, y el contenido de texto podría ser una cadena JSON que sería analizada y aceptada por la aplicación FastAPI. Esto se ha corregido en FastAPI 0.65.2. Ahora los datos de la petición se analizan como JSON sólo si la encabezado content-type es application/json u otro tipo de medio compatible con JSON como application/geo+json. Es mejor actualizar a la última FastAPI, pero si la actualización no es posible, entonces un middleware o una dependencia que compruebe la encabezado de tipo de contenido y aborte la petición si no es application/json u otro tipo de contenido compatible con JSON puede actuar como una solución de mitigación",
               },
            ],
            id: "CVE-2021-32677",
            lastModified: "2024-02-12T20:04:02.160",
            metrics: {
               cvssMetricV2: [
                  {
                     acInsufInfo: false,
                     baseSeverity: "MEDIUM",
                     cvssData: {
                        accessComplexity: "MEDIUM",
                        accessVector: "NETWORK",
                        authentication: "NONE",
                        availabilityImpact: "NONE",
                        baseScore: 5.8,
                        confidentialityImpact: "PARTIAL",
                        integrityImpact: "PARTIAL",
                        vectorString: "AV:N/AC:M/Au:N/C:P/I:P/A:N",
                        version: "2.0",
                     },
                     exploitabilityScore: 8.6,
                     impactScore: 4.9,
                     obtainAllPrivilege: false,
                     obtainOtherPrivilege: false,
                     obtainUserPrivilege: false,
                     source: "nvd@nist.gov",
                     type: "Primary",
                     userInteractionRequired: true,
                  },
               ],
               cvssMetricV31: [
                  {
                     cvssData: {
                        attackComplexity: "LOW",
                        attackVector: "NETWORK",
                        availabilityImpact: "NONE",
                        baseScore: 8.1,
                        baseSeverity: "HIGH",
                        confidentialityImpact: "HIGH",
                        integrityImpact: "HIGH",
                        privilegesRequired: "NONE",
                        scope: "UNCHANGED",
                        userInteraction: "REQUIRED",
                        vectorString: "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N",
                        version: "3.1",
                     },
                     exploitabilityScore: 2.8,
                     impactScore: 5.2,
                     source: "nvd@nist.gov",
                     type: "Primary",
                  },
                  {
                     cvssData: {
                        attackComplexity: "LOW",
                        attackVector: "NETWORK",
                        availabilityImpact: "NONE",
                        baseScore: 8.2,
                        baseSeverity: "HIGH",
                        confidentialityImpact: "LOW",
                        integrityImpact: "HIGH",
                        privilegesRequired: "NONE",
                        scope: "UNCHANGED",
                        userInteraction: "NONE",
                        vectorString: "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N",
                        version: "3.1",
                     },
                     exploitabilityScore: 3.9,
                     impactScore: 4.2,
                     source: "security-advisories@github.com",
                     type: "Secondary",
                  },
               ],
            },
            published: "2021-06-09T18:15:08.553",
            references: [
               {
                  source: "security-advisories@github.com",
                  tags: [
                     "Patch",
                     "Third Party Advisory",
                  ],
                  url: "https://github.com/tiangolo/fastapi/commit/fa7e3c996edf2d5482fff8f9d890ac2390dede4d",
               },
               {
                  source: "security-advisories@github.com",
                  tags: [
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                  ],
                  url: "https://github.com/tiangolo/fastapi/security/advisories/GHSA-8h2j-cgx8-6xv7",
               },
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                  source: "security-advisories@github.com",
                  url: "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MATAWX25TYKNEKLDMKWNLYDB34UWTROA/",
               },
            ],
            sourceIdentifier: "security-advisories@github.com",
            vulnStatus: "Modified",
            weaknesses: [
               {
                  description: [
                     {
                        lang: "en",
                        value: "CWE-352",
                     },
                  ],
                  source: "security-advisories@github.com",
                  type: "Primary",
               },
            ],
         },
      },
   },
}


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