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CVE-2018-5118

Estado: ModificadaMedia (5.3)—

Las imágenes de captura de pantalla que se muestran en la página Activity Stream que aparece cuando se abre una nueva pestaña se crean a partir de las etiquetas meta de los sitios web. Se descubrió un problema en el que la página podría intentar crear estas imágenes a través de URL "file:" desde el sistema de archivos local. Esta carga es bloqueada por el sandbox, pero podría exponer datos locales si se combina con otro ataque que se escapa de las protecciones del sandbox. Esta vulnerabilidad afecta a las versiones anteriores a la 58 de Firefox.

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)

Canonical — Ubuntu LinuxMozilla — Firefox

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2018-5118",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
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        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:N",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
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        "type": "Primary",
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        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.0",
          "baseScore": 5.3,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 1.4,
        "exploitabilityScore": 3.9
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  "affected": [
    {
      "source": "security@mozilla.org",
      "affectedData": [
        {
          "vendor": "Mozilla",
          "product": "Firefox",
          "versions": [
            {
              "status": "affected",
              "version": "unspecified",
              "lessThan": "58",
              "versionType": "custom"
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        }
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  "published": "2018-06-11T21:29:13.623",
  "references": [
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      "url": "http://www.securityfocus.com/bid/102786",
      "tags": [
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      "source": "security@mozilla.org"
    },
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      "tags": [
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        "VDB Entry"
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      "source": "security@mozilla.org"
    },
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      "source": "security@mozilla.org"
    },
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      "url": "https://usn.ubuntu.com/3544-1/",
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      "url": "https://www.mozilla.org/security/advisories/mfsa2018-02/",
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  ],
  "vulnStatus": "Modified",
  "weaknesses": [
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      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-200"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The screenshot images displayed in the Activity Stream page displayed when a new tab is opened is created from the meta tags of websites. An issue was discovered where the page could attempt to create these images through \"file:\" URLs from the local file system. This loading is blocked by the sandbox but could expose local data if combined with another attack that escapes sandbox protections. This vulnerability affects Firefox < 58."
    },
    {
      "lang": "es",
      "value": "Las imágenes de captura de pantalla que se muestran en la página Activity Stream que aparece cuando se abre una nueva pestaña se crean a partir de las etiquetas meta de los sitios web. Se descubrió un problema en el que la página podría intentar crear estas imágenes a través de URL \"file:\" desde el sistema de archivos local. Esta carga es bloqueada por el sandbox, pero podría exponer datos locales si se combina con otro ataque que se escapa de las protecciones del sandbox. Esta vulnerabilidad afecta a las versiones anteriores a la 58 de Firefox."
    }
  ],
  "lastModified": "2026-06-17T01:59:39.340",
  "configurations": [
    {
      "nodes": [
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          "cpeMatch": [
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              "vulnerable": true,
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              "versionEndIncluding": "57.0.4"
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}