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CVE-2019-19234

Estado: ModificadaAlta (7.5)—

In Sudo through 1.8.29, the fact that a user has been blocked (e.g., by using the ! character in the shadow file instead of a password hash) is not considered, allowing an attacker (who has access to a Runas ALL sudoer account) to impersonate any blocked user. NOTE: The software maintainer believes that this CVE is not valid. Disabling local password authentication for a user is not the same as disabling all access to that user--the user may still be able to login via other means (ssh key, kerberos, etc). Both the Linux shadow(5) and passwd(1) manuals are clear on this.

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Indeed it is a valid use case to have local accounts that are _only_ accessible via sudo and that cannot be logged into with a password. Sudo 1.8.30 added an optional setting to check the _shell_ of the target user (not the encrypted password!) against the contents of /etc/shells but that is not the same thing as preventing access to users with an invalid password hash

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)

Sudo — Sudo

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2019-19234",
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      "sourceIdentifier": "cve@mitre.org"
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          "baseScore": 5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
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          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
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  "published": "2019-12-19T21:15:13.823",
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      "description": [
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      "lang": "en",
      "value": "In Sudo through 1.8.29, the fact that a user has been blocked (e.g., by using the ! character in the shadow file instead of a password hash) is not considered, allowing an attacker (who has access to a Runas ALL sudoer account) to impersonate any blocked user. NOTE: The software maintainer believes that this CVE is not valid. Disabling local password authentication for a user is not the same as disabling all access to that user--the user may still be able to login via other means (ssh key, kerberos, etc). Both the Linux shadow(5) and passwd(1) manuals are clear on this. Indeed it is a valid use case to have local accounts that are _only_ accessible via sudo and that cannot be logged into with a password. Sudo 1.8.30 added an optional setting to check the _shell_ of the target user (not the encrypted password!) against the contents of /etc/shells but that is not the same thing as preventing access to users with an invalid password hash"
    },
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      "lang": "es",
      "value": "** EN DISPUTA ** En Sudo hasta la versión 1.8.29, no se considera el hecho de que un usuario haya sido bloqueado (por ejemplo, al usar el carácter! En el archivo de sombra en lugar de un hash de contraseña), lo que permite que un atacante (que tiene acceso a una cuenta de sudoer Runas ALL) para suplantar a cualquier usuario bloqueado. NOTA: El responsable del software cree que este CVE no es válido. Deshabilitar la autenticación de contraseña local para un usuario no es lo mismo que deshabilitar todo acceso a ese usuario; el usuario aún puede iniciar sesión por otros medios (clave ssh, kerberos, etc.). Tanto los manuales Linux shadow (5) como passwd (1) son claros al respecto. De hecho, es un caso de uso válido tener cuentas locales a las que solo se puede acceder mediante sudo y que no se pueden iniciar sesión con una contraseña. Sudo 1.8.30 agregó una configuración opcional para verificar el _shell_ del usuario objetivo (¡no la contraseña cifrada!) Contra el contenido de / etc / shells, pero eso no es lo mismo que impedir el acceso a los usuarios con un hash de contraseña no válido."
    }
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  "lastModified": "2026-06-17T02:26:20.740",
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