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CVE-2019-11753

Estado: ModificadaAlta (7.8)—

El instalador de Firefox permite que Firefox sea instalado en una ubicación de escritura personalizada del usuario, dejándolo desprotegido contra la manipulación por parte de usuarios no privilegiados o un malware. Si el Servicio de Mantenimiento de Mozilla es manipulado para actualizar esta ubicación desprotegida y el servicio de mantenimiento actualizado en la ubicación desprotegida ha sido modificado, el servicio de mantenimiento alterado puede ejecutarse con privilegios elevados durante el proceso de actualización debido a la falta de comprobaciones de integridad.

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Esto permite la escalada de privilegios si el ejecutable ha sido sustituido localmente. <br>*Nota: Este ataque requiere acceso al sistema local y solo afecta a Windows. Otros sistemas operativos no están afectados. *. Esta vulnerabilidad afecta a Firefox versiones anteriores a 69, Firefox ESR versiones anteriores a 60.9 y Firefox ESR versiones anteriores a 68.1.

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)

Mozilla — FirefoxMozilla — Firefox ESR

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2019-11753",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 4.6,
          "accessVector": "LOCAL",
          "vectorString": "AV:L/AC:L/Au:N/C:P/I:P/A:P",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 6.4,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 3.9,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
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        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "security@mozilla.org",
      "affectedData": [
        {
          "vendor": "Mozilla",
          "product": "Firefox",
          "versions": [
            {
              "status": "affected",
              "version": "unspecified",
              "lessThan": "69",
              "versionType": "custom"
            }
          ]
        },
        {
          "vendor": "Mozilla",
          "product": "Firefox ESR",
          "versions": [
            {
              "status": "affected",
              "version": "unspecified",
              "lessThan": "60.9",
              "versionType": "custom"
            },
            {
              "status": "affected",
              "version": "unspecified",
              "lessThan": "68.1",
              "versionType": "custom"
            }
          ]
        }
      ]
    }
  ],
  "published": "2019-09-27T18:15:13.677",
  "references": [
    {
      "url": "http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00011.html",
      "source": "security@mozilla.org"
    },
    {
      "url": "http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00017.html",
      "source": "security@mozilla.org"
    },
    {
      "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1574980",
      "tags": [
        "Issue Tracking",
        "Permissions Required",
        "Vendor Advisory"
      ],
      "source": "security@mozilla.org"
    },
    {
      "url": "https://www.mozilla.org/security/advisories/mfsa2019-25/",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "security@mozilla.org"
    },
    {
      "url": "https://www.mozilla.org/security/advisories/mfsa2019-26/",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "security@mozilla.org"
    },
    {
      "url": "https://www.mozilla.org/security/advisories/mfsa2019-27/",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "security@mozilla.org"
    },
    {
      "url": "http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00011.html",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00017.html",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1574980",
      "tags": [
        "Issue Tracking",
        "Permissions Required",
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://www.mozilla.org/security/advisories/mfsa2019-25/",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://www.mozilla.org/security/advisories/mfsa2019-26/",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://www.mozilla.org/security/advisories/mfsa2019-27/",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-354"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The Firefox installer allows Firefox to be installed to a custom user writable location, leaving it unprotected from manipulation by unprivileged users or malware. If the Mozilla Maintenance Service is manipulated to update this unprotected location and the updated maintenance service in the unprotected location has been altered, the altered maintenance service can run with elevated privileges during the update process due to a lack of integrity checks. This allows for privilege escalation if the executable has been replaced locally. <br>*Note: This attack requires local system access and only affects Windows. Other operating systems are not affected.*. This vulnerability affects Firefox < 69, Firefox ESR < 60.9, and Firefox ESR < 68.1."
    },
    {
      "lang": "es",
      "value": "El instalador de Firefox permite que Firefox sea instalado en una ubicación de escritura personalizada del usuario, dejándolo desprotegido contra la manipulación por parte de usuarios no privilegiados o un malware. Si el Servicio de Mantenimiento de Mozilla es manipulado para actualizar esta ubicación desprotegida y el servicio de mantenimiento actualizado en la ubicación desprotegida ha sido modificado, el servicio de mantenimiento alterado puede ejecutarse con privilegios elevados durante el proceso de actualización debido a la falta de comprobaciones de integridad. Esto permite la escalada de privilegios si el ejecutable ha sido sustituido localmente. <br>*Nota: Este ataque requiere acceso al sistema local y solo afecta a Windows. Otros sistemas operativos no están afectados. *. Esta vulnerabilidad afecta a Firefox versiones anteriores a 69, Firefox ESR versiones anteriores a 60.9 y Firefox ESR versiones anteriores a 68.1."
    }
  ],
  "lastModified": "2026-06-17T02:13:34.303",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "vulnerable": true,
              "matchCriteriaId": "D231E5FC-4EBD-425A-95A9-634A155E2A33",
              "versionEndExcluding": "60.9.0"
            },
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              "vulnerable": true,
              "matchCriteriaId": "299AA921-46BD-4E9F-8D74-F304F44C6EB4",
              "versionEndExcluding": "69.0"
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}