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CVE-2023-38546

Estado: ModificadaBaja (3.7)—

This flaw allows an attacker to insert cookies at will into a running program using libcurl, if the specific series of conditions are met.

libcurl performs transfers. In its API, an application creates "easy handles" that are the individual handles for single transfers.

libcurl provides a function call that duplicates en easy handle called [curl_easy_duphandle](https://curl.se/libcurl/c/curl_easy_duphandle.html).

If a transfer has cookies enabled when the handle is duplicated, the cookie-enable state is also cloned - but without cloning the actual cookies. If the source handle did not read any cookies from a specific file on disk, the cloned version of the handle would instead store the file name as `none` (using the four ASCII letters, no quotes).

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Subsequent use of the cloned handle that does not explicitly set a source to load cookies from would then inadvertently load cookies from a file named `none` - if such a file exists and is readable in the current directory of the program using libcurl. And if using the correct file format of course.

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 (1)

Haxx — Libcurl

CWE

Referencias

JSON original (NVD)

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          "value": "NVD-CWE-noinfo"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "This flaw allows an attacker to insert cookies at will into a running program\nusing libcurl, if the specific series of conditions are met.\n\nlibcurl performs transfers. In its API, an application creates \"easy handles\"\nthat are the individual handles for single transfers.\n\nlibcurl provides a function call that duplicates en easy handle called\n[curl_easy_duphandle](https://curl.se/libcurl/c/curl_easy_duphandle.html).\n\nIf a transfer has cookies enabled when the handle is duplicated, the\ncookie-enable state is also cloned - but without cloning the actual\ncookies. If the source handle did not read any cookies from a specific file on\ndisk, the cloned version of the handle would instead store the file name as\n`none` (using the four ASCII letters, no quotes).\n\nSubsequent use of the cloned handle that does not explicitly set a source to\nload cookies from would then inadvertently load cookies from a file named\n`none` - if such a file exists and is readable in the current directory of the\nprogram using libcurl. And if using the correct file format of course."
    },
    {
      "lang": "es",
      "value": "Esta falla permite a un atacante insertar cookies a voluntad en un programa en ejecución usando libcurl, si se cumple una serie específica de condiciones. libcurl realiza transferencias. En su API, una aplicación crea \"easy handles\" que son identificadores individuales para transferencias individuales. libcurl proporciona una llamada de función que duplica un identificador sencillo llamado [curl_easy_duphandle](https://curl.se/libcurl/c/curl_easy_duphandle.html). Si una transferencia tiene cookies habilitadas cuando el identificador está duplicado, el estado de habilitación de cookies también se clona, pero sin clonar las cookies reales. Si el identificador de origen no leyó ninguna cookie de un archivo específico en el disco, la versión clonada del identificador almacenaría el nombre del archivo como \"none\" (usando las cuatro letras ASCII, sin comillas). El uso posterior del identificador clonado que no establece explícitamente una fuente desde la cual cargar cookies cargaría inadvertidamente cookies desde un archivo llamado \"none\", si dicho archivo existe y es legible en el directorio actual del programa usando libcurl. Y si utiliza el formato de archivo correcto, por supuesto."
    }
  ],
  "lastModified": "2026-06-17T06:10:41.860",
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}