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CVE-2017-7761

Estado: ModificadaMedia (5.5)—

La aplicación "helper.exe" de Mozilla Maintenance Service crea un directorio temporal escribible por usuarios no privilegiados. Cuando esto se combina con la creación de un junction (un tipo de vínculo simbólico), los archivos protegidos en el directorio objetivo del junction pueden ser eliminados por Mozilla Maintenance Service, el cual tiene acceso privilegiado. Nota: Este ataque requiere acceso local al sistema y solo afecta a Windows. Otros sistemas operativos no se han visto afectados. La vulnerabilidad afecta a Firefox ESR en versiones anteriores a la 52.2 y Firefox en versiones anteriores a la 54.

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)

Mozilla — Firefox

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2017-7761",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 3.6,
          "accessVector": "LOCAL",
          "vectorString": "AV:L/AC:L/Au:N/C:N/I:P/A:P",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 4.9,
        "baseSeverity": "LOW",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 3.9,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
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          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "security@mozilla.org",
      "affectedData": [
        {
          "vendor": "Mozilla",
          "product": "Firefox ESR",
          "versions": [
            {
              "status": "affected",
              "version": "unspecified",
              "lessThan": "52.2",
              "versionType": "custom"
            }
          ]
        },
        {
          "vendor": "Mozilla",
          "product": "Firefox",
          "versions": [
            {
              "status": "affected",
              "version": "unspecified",
              "lessThan": "54",
              "versionType": "custom"
            }
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        }
      ]
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  ],
  "published": "2018-06-11T21:29:08.297",
  "references": [
    {
      "url": "http://www.securityfocus.com/bid/99057",
      "tags": [
        "Third Party Advisory",
        "VDB Entry"
      ],
      "source": "security@mozilla.org"
    },
    {
      "url": "http://www.securitytracker.com/id/1038689",
      "tags": [
        "Third Party Advisory",
        "VDB Entry"
      ],
      "source": "security@mozilla.org"
    },
    {
      "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1215648",
      "tags": [
        "Issue Tracking",
        "Vendor Advisory"
      ],
      "source": "security@mozilla.org"
    },
    {
      "url": "https://sourceforge.net/p/nsis/bugs/1125/",
      "tags": [
        "Issue Tracking",
        "Third Party Advisory"
      ],
      "source": "security@mozilla.org"
    },
    {
      "url": "https://www.mozilla.org/security/advisories/mfsa2017-15/",
      "tags": [
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      "source": "security@mozilla.org"
    },
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      "url": "https://www.mozilla.org/security/advisories/mfsa2017-16/",
      "tags": [
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      "source": "security@mozilla.org"
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    {
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      "tags": [
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      "tags": [
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        "VDB Entry"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
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      "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1215648",
      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
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      "url": "https://sourceforge.net/p/nsis/bugs/1125/",
      "tags": [
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        "Third Party Advisory"
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    },
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      "url": "https://www.mozilla.org/security/advisories/mfsa2017-15/",
      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
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      "url": "https://www.mozilla.org/security/advisories/mfsa2017-16/",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-276"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The Mozilla Maintenance Service \"helper.exe\" application creates a temporary directory writable by non-privileged users. When this is combined with creation of a junction (a form of symbolic link), protected files in the target directory of the junction can be deleted by the Mozilla Maintenance Service, which has privileged access. Note: This attack requires local system access and only affects Windows. Other operating systems are not affected. This vulnerability affects Firefox ESR < 52.2 and Firefox < 54."
    },
    {
      "lang": "es",
      "value": "La aplicación \"helper.exe\" de Mozilla Maintenance Service crea un directorio temporal escribible por usuarios no privilegiados. Cuando esto se combina con la creación de un junction (un tipo de vínculo simbólico), los archivos protegidos en el directorio objetivo del junction pueden ser eliminados por Mozilla Maintenance Service, el cual tiene acceso privilegiado. Nota: Este ataque requiere acceso local al sistema y solo afecta a Windows. Otros sistemas operativos no se han visto afectados. La vulnerabilidad afecta a Firefox ESR en versiones anteriores a la 52.2 y Firefox en versiones anteriores a la 54."
    }
  ],
  "lastModified": "2026-06-17T01:25:08.653",
  "configurations": [
    {
      "nodes": [
        {
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}