CVE-2021-41270

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Starting with versions 4.4.34 and 5.3.12, Symfony now follows the OWASP recommendations and uses the single quote `'` to prefix formulas and add the prefix to cells starting by `\\t`, `\\r` as well as `=`, `+`, `-` and `@`."}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}}], "problemTypes": [{"descriptions": [{"cweId": "CWE-1236", "description": "CWE-1236: Improper Neutralization of Formula Elements in a CSV File", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"dateUpdated": "2021-12-03T02:06:25.000Z", "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M"}, "references": [{"tags": ["x_refsource_MISC"], "url": "https://github.com/symfony/symfony/pull/44243"}, {"tags": ["x_refsource_MISC"], "url": "https://github.com/symfony/symfony/releases/tag/v5.3.12"}, {"tags": ["x_refsource_CONFIRM"], "url": "https://github.com/symfony/symfony/security/advisories/GHSA-2xhg-w2g5-w95x"}, {"tags": ["x_refsource_MISC"], "url": "https://github.com/symfony/symfony/commit/3da6f2d45e7536ccb2a26f52fbaf340917e208a8"}, {"name": "FEDORA-2021-0294e8ca24", "tags": ["vendor-advisory", "x_refsource_FEDORA"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QSREFD2TJT5LWKM6S4MD3W26NQQ5WJUP/"}, {"name": "FEDORA-2021-10fd47b32d", "tags": ["vendor-advisory", "x_refsource_FEDORA"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3BPT4SF6SIXFMZARDWED5T32J7JEH3EP/"}], "source": {"advisory": "GHSA-2xhg-w2g5-w95x", "discovery": "UNKNOWN"}, "title": "CSV Injection in Symfony", "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "security-advisories@github.com", "ID": "CVE-2021-41270", "STATE": "PUBLIC", "TITLE": "CSV Injection in Symfony"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "symfony", "version": {"version_data": [{"version_value": ">= 4.1.0, < 4.4.35"}, {"version_value": ">= 5.0.0, < 5.3.12"}]}}]}, "vendor_name": "symfony"}]}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "Symfony/Serializer handles serializing and deserializing data structures for Symfony, a PHP framework for web and console applications and a set of reusable PHP components. Symfony versions 4.1.0 before 4.4.35 and versions 5.0.0 before 5.3.12 are vulnerable to CSV injection, also known as formula injection. In Symfony 4.1, maintainers added the opt-in `csv_escape_formulas` option in the `CsvEncoder`, to prefix all cells starting with `=`, `+`, `-` or `@` with a tab `\\t`. Since then, OWASP added 2 chars in that list: Tab (0x09) and Carriage return (0x0D). This makes the previous prefix char (Tab `\\t`) part of the vulnerable characters, and OWASP suggests using the single quote `'` for prefixing the value. Starting with versions 4.4.34 and 5.3.12, Symfony now follows the OWASP recommendations and uses the single quote `'` to prefix formulas and add the prefix to cells starting by `\\t`, `\\r` as well as `=`, `+`, `-` and `@`."}]}, "impact": {"cvss": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "CWE-1236: Improper Neutralization of Formula Elements in a CSV File"}]}]}, "references": {"reference_data": [{"name": "https://github.com/symfony/symfony/pull/44243", "refsource": "MISC", "url": "https://github.com/symfony/symfony/pull/44243"}, {"name": "https://github.com/symfony/symfony/releases/tag/v5.3.12", "refsource": "MISC", "url": "https://github.com/symfony/symfony/releases/tag/v5.3.12"}, {"name": "https://github.com/symfony/symfony/security/advisories/GHSA-2xhg-w2g5-w95x", "refsource": "CONFIRM", "url": "https://github.com/symfony/symfony/security/advisories/GHSA-2xhg-w2g5-w95x"}, {"name": "https://github.com/symfony/symfony/commit/3da6f2d45e7536ccb2a26f52fbaf340917e208a8", "refsource": "MISC", "url": "https://github.com/symfony/symfony/commit/3da6f2d45e7536ccb2a26f52fbaf340917e208a8"}, {"name": "FEDORA-2021-0294e8ca24", "refsource": "FEDORA", "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QSREFD2TJT5LWKM6S4MD3W26NQQ5WJUP/"}, {"name": "FEDORA-2021-10fd47b32d", "refsource": "FEDORA", "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3BPT4SF6SIXFMZARDWED5T32J7JEH3EP/"}]}, "source": {"advisory": "GHSA-2xhg-w2g5-w95x", "discovery": "UNKNOWN"}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T03:08:31.658Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/symfony/symfony/pull/44243"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/symfony/symfony/releases/tag/v5.3.12"}, {"tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "https://github.com/symfony/symfony/security/advisories/GHSA-2xhg-w2g5-w95x"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/symfony/symfony/commit/3da6f2d45e7536ccb2a26f52fbaf340917e208a8"}, {"name": "FEDORA-2021-0294e8ca24", "tags": ["vendor-advisory", "x_refsource_FEDORA", "x_transferred"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QSREFD2TJT5LWKM6S4MD3W26NQQ5WJUP/"}, {"name": "FEDORA-2021-10fd47b32d", "tags": ["vendor-advisory", "x_refsource_FEDORA", "x_transferred"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3BPT4SF6SIXFMZARDWED5T32J7JEH3EP/"}]}]}, "cveMetadata": {"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "assignerShortName": "GitHub_M", "cveId": "CVE-2021-41270", "datePublished": "2021-11-24T19:05:11.000Z", "dateReserved": "2021-09-15T00:00:00.000Z", "dateUpdated": "2024-08-04T03:08:31.658Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

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Symfony versions 4.1.0 before 4.4.35 and versions 5.0.0 before 5.3.12 are vulnerable to CSV injection, also known as formula injection. In Symfony 4.1, maintainers added the opt-in `csv_escape_formulas` option in the `CsvEncoder`, to prefix all cells starting with `=`, `+`, `-` or `@` with a tab `\\t`. Since then, OWASP added 2 chars in that list: Tab (0x09) and Carriage return (0x0D). This makes the previous prefix char (Tab `\\t`) part of the vulnerable characters, and OWASP suggests using the single quote `'` for prefixing the value. Starting with versions 4.4.34 and 5.3.12, Symfony now follows the OWASP recommendations and uses the single quote `'` to prefix formulas and add the prefix to cells starting by `\\t`, `\\r` as well as `=`, `+`, `-` and `@`."}, {"lang": "es", "value": "Symfony/Serializer maneja la serializaci\u00f3n y deserializaci\u00f3n de estructuras de datos para Symfony, un framework PHP para aplicaciones web y de consola y un conjunto de componentes PHP reusables. Symfony versiones 4.1.0 anteriores a 4.4.35 y versiones 5.0.0 anteriores a 5.3.12, son vulnerables a una inyecci\u00f3n de CSV, tambi\u00e9n se conoce como inyecci\u00f3n de f\u00f3rmulas. En Symfony 4.1, los mantenedores a\u00f1adieron la opci\u00f3n \"csv_escape_formulas\" en el \"CsvEncoder\", para prefijar todas las celdas que empiezan con \"=\", \"+\", \"-\" o \"@\" con un tabulador \"\\t\". Desde entonces, OWASP ha a\u00f1adido 2 caracteres en esa lista: Tabulador (0x09) y retorno de Carro (0x0D). Esto hace que el anterior car\u00e1cter de prefijo (Tab \"\\t\") forme parte de los caracteres vulnerables, y OWASP sugiere usar la comilla simple \"'\" para prefijar el valor. A partir de las versiones 4.4.34 y 5.3.12, Symfony ahora sigue las recomendaciones de OWASP y usa la comilla simple \"'\" para prefijar las f\u00f3rmulas y a\u00f1adir el prefijo a las celdas que empiezan por \"\\t\", \"\\r\" as\u00ed como \"=\", \"+\", \"-\" y \"@\""}], "id": "CVE-2021-41270", "lastModified": "2026-06-17T04:08:12.617", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "SINGLE", "availabilityImpact": "NONE", "baseScore": 4.0, "confidentialityImpact": "PARTIAL", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:S/C:P/I:N/A:N", "version": "2.0"}, "exploitabilityScore": 8.0, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2021-11-24T19:15:07.887", "references": [{"source": "security-advisories@github.com", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/symfony/symfony/commit/3da6f2d45e7536ccb2a26f52fbaf340917e208a8"}, {"source": "security-advisories@github.com", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/symfony/symfony/pull/44243"}, {"source": "security-advisories@github.com", "tags": ["Release Notes", "Third Party Advisory"], "url": "https://github.com/symfony/symfony/releases/tag/v5.3.12"}, {"source": "security-advisories@github.com", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/symfony/symfony/security/advisories/GHSA-2xhg-w2g5-w95x"}, {"source": "security-advisories@github.com", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3BPT4SF6SIXFMZARDWED5T32J7JEH3EP/"}, {"source": "security-advisories@github.com", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QSREFD2TJT5LWKM6S4MD3W26NQQ5WJUP/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/symfony/symfony/commit/3da6f2d45e7536ccb2a26f52fbaf340917e208a8"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/symfony/symfony/pull/44243"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Release Notes", "Third Party Advisory"], "url": "https://github.com/symfony/symfony/releases/tag/v5.3.12"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/symfony/symfony/security/advisories/GHSA-2xhg-w2g5-w95x"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3BPT4SF6SIXFMZARDWED5T32J7JEH3EP/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QSREFD2TJT5LWKM6S4MD3W26NQQ5WJUP/"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-1236"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

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