CVE-2021-41270

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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 \"@\""}], "lastModified": "2024-11-21T06:25:56.007", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "2A678C35-5C92-4E2D-9AB4-6D59E4DDE3E0", "versionEndExcluding": "4.4.35", "versionStartIncluding": "4.1.0"}, {"criteria": "cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "EF30246A-DE78-4ECA-9FF7-48D48674FA33", "versionEndExcluding": "5.3.12", "versionStartIncluding": "5.0.0"}], "operator": "OR"}]}, {"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "A930E247-0B43-43CB-98FF-6CE7B8189835"}, {"criteria": "cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "80E516C0-98A4-4ADE-B69F-66A772E2BAAA"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}