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CVE-2017-16790

Estado: ModificadaMedia (6.5)—

An issue was discovered in Symfony before 2.7.38, 2.8.31, 3.2.14, 3.3.13, 3.4-BETA5, and 4.0-BETA5. When a form is submitted by the user, the request handler classes of the Form component merge POST data and uploaded files data into one array. This big array forms the data that are then bound to the form. At this stage there is no difference anymore between submitted POST data and uploaded files.

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A user can send a crafted HTTP request where the value of a "FileType" is sent as normal POST data that could be interpreted as a local file path on the server-side (for example, "file:///etc/passwd"). If the application did not perform any additional checks about the value submitted to the "FileType", the contents of the given file on the server could have been exposed to the attacker.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (2)

Debian — Debian LinuxSensiolabs — Symfony

CWE

Referencias

JSON original (NVD)

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      "value": "An issue was discovered in Symfony before 2.7.38, 2.8.31, 3.2.14, 3.3.13, 3.4-BETA5, and 4.0-BETA5. When a form is submitted by the user, the request handler classes of the Form component merge POST data and uploaded files data into one array. This big array forms the data that are then bound to the form. At this stage there is no difference anymore between submitted POST data and uploaded files. A user can send a crafted HTTP request where the value of a \"FileType\" is sent as normal POST data that could be interpreted as a local file path on the server-side (for example, \"file:///etc/passwd\"). If the application did not perform any additional checks about the value submitted to the \"FileType\", the contents of the given file on the server could have been exposed to the attacker."
    },
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      "value": "Se ha descubierto un problema en Symfony en versiones anteriores a la 2.7.38, 2.8.31, 3.2.14, 3.3.13, 3.4-BETA5 y 4.0-BETA5. Cuando un usuario envía un formulario, las clases del manipulador de petición del componente Form combinan los datos POST y suben los archivos en un array. Este array grande forma los datos que se enlazan al formulario. En este punto, ya no hay diferencias entre los datos POST enviados y los archivos subidos. Un usuario puede enviar una petición HTTP manipulada donde el valor de un \"FileType\" se envía como datos POST normales que podrían ser interpretados como ruta de archivo local del lado del servidor (por ejemplo, \"file:///etc/passwd\"). Si la aplicación no realiza comprobaciones adicionales sobre el valor enviado a \"FileType\", el contenido del archivo dado en el servidor podría haberse expuesto al atacante."
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  "lastModified": "2026-06-17T01:09:55.853",
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