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CVE-2019-9858

Estado: ModificadaAlta (8.8)—

Remote code execution was discovered in Horde Groupware Webmail 5.2.22 and 5.2.17. Horde/Form/Type.php contains a vulnerable class that handles image upload in forms. When the Horde_Form_Type_image method onSubmit() is called on uploads, it invokes the functions getImage() and _getUpload(), which uses unsanitized user input as a path to save the image. The unsanitized POST parameter object[photo][img][file] is saved in the $upload[img][file] PHP variable, allowing an attacker to manipulate the $tmp_file passed to move_uploaded_file() to save the uploaded file.

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By setting the parameter to (for example) ../usr/share/horde/static/bd.php, one can write a PHP backdoor inside the web root. The static/ destination folder is a good candidate to drop the backdoor because it is always writable in Horde installations. (The unsanitized POST parameter went probably unnoticed because it's never submitted by the forms, which default to securely using a random path.)

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 LinuxHorde — Groupware

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2019-9858",
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          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:S/C:P/I:P/A:P",
          "authentication": "SINGLE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
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        "acInsufInfo": false,
        "impactScore": 6.4,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8,
        "obtainUserPrivilege": false,
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          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
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          "privilegesRequired": "LOW",
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        "exploitabilityScore": 2.8
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  "affected": [
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      "affectedData": [
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  "published": "2019-05-29T17:29:00.633",
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  "vulnStatus": "Modified",
  "weaknesses": [
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      "description": [
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          "lang": "en",
          "value": "CWE-22"
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      ]
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Remote code execution was discovered in Horde Groupware Webmail 5.2.22 and 5.2.17. Horde/Form/Type.php contains a vulnerable class that handles image upload in forms. When the Horde_Form_Type_image method onSubmit() is called on uploads, it invokes the functions getImage() and _getUpload(), which uses unsanitized user input as a path to save the image. The unsanitized POST parameter object[photo][img][file] is saved in the $upload[img][file] PHP variable, allowing an attacker to manipulate the $tmp_file passed to move_uploaded_file() to save the uploaded file. By setting the parameter to (for example) ../usr/share/horde/static/bd.php, one can write a PHP backdoor inside the web root. The static/ destination folder is a good candidate to drop the backdoor because it is always writable in Horde installations. (The unsanitized POST parameter went probably unnoticed because it's never submitted by the forms, which default to securely using a random path.)"
    },
    {
      "lang": "es",
      "value": "Fue encontrada una ejecución remota de código en Horde Groupware Webmail versión 5.2.22 y versión 5.2.17. El archivo Horde/Form/Type.php contiene una clase vulnerable que maneja la carga de imágenes en formularios. Cuando se llama al método Horde_Form_Type_image en la función onSubmit () en las cargas, hace un llamado a las funciones getImage() y _getUpload(), que utiliza una entrada de usuario no autorizada como un path para guardar la imagen. La falta de saneamiento del parámetro POST object[photo][img][file] se guarda en la variable PHP  $upload[img][file], lo que permite a un atacante manipular el archivo $tmp_file pasado a move_uploaded_file() para guardar el archivo cargado. Al establecer el parámetro en (por ejemplo) ../usr/share/horde/static/bd.php, se puede escribir un backdoor PHP dentro de la web root. La carpeta de destino static/ es un buen candidato para abandonar la  backdoor y siempre se puede escribir en las instalaciones Horde. (El parámetro POST no saneado probablemente pasó desapercibido porque nunca fue enviado a los formularios, que de forma predeterminada utilizan una path aleatoria)."
    }
  ],
  "lastModified": "2026-06-17T02:44:44.273",
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