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CVE-2025-27591

Estado: AnalizadaMedia (6.8)—

A privilege escalation vulnerability existed in the Below service prior to v0.9.0 due to the creation of a world-writable directory at /var/log/below. This could have allowed local unprivileged users to escalate to root privileges through symlink attacks that manipulate files such as /etc/shadow.

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)

Facebook — Below

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2025-27591",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
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        "ssvcData": {
          "id": "CVE-2025-27591",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2025-03-21T20:37:38.689510Z"
        }
      }
    ],
    "cvssMetricV31": [
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        "cvssData": {
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          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 4.2,
        "exploitabilityScore": 2.5
      }
    ]
  },
  "affected": [
    {
      "source": "cve-assign@fb.com",
      "affectedData": [
        {
          "vendor": "Meta Platforms, Inc",
          "product": "below",
          "versions": [
            {
              "status": "affected",
              "version": "0.0.0",
              "lessThan": "0.9.0",
              "versionType": "semver"
            }
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  ],
  "published": "2025-03-11T19:15:43.390",
  "references": [
    {
      "url": "https://github.com/facebookincubator/below/commit/da9382e6e3e332fd2c3195e22f34977f83f0f1f3",
      "tags": [
        "Patch"
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      "url": "https://www.facebook.com/security/advisories/cve-2025-27591",
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      "url": "http://www.openwall.com/lists/oss-security/2025/03/12/1",
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  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
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          "value": "CWE-732"
        }
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  ],
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    },
    {
      "lang": "es",
      "value": "En el servicio Below existía una vulnerabilidad de escalada de privilegios antes de la versión v0.9.0 debido a la creación de un directorio con permisos de escritura para todo el mundo en /var/log/below. Esto podría haber permitido que usuarios locales sin privilegios escalaran a privilegios de superusuario mediante ataques de enlaces simbólicos que manipulan archivos como /etc/shadow."
    }
  ],
  "lastModified": "2026-06-17T09:03:52.557",
  "configurations": [
    {
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        {
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              "versionEndExcluding": "0.9.0"
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          "operator": "OR"
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      ]
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  ],
  "sourceIdentifier": "cve-assign@fb.com"
}