CVE-2025-62506

{
  "id": "CVE-2025-62506",
  "sourceIdentifier": "[email protected]",
  "published": "2025-10-16T22:15:31.703",
  "lastModified": "2026-10-19T16:10:00.260",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "MinIO is a high-performance object storage system. In all versions prior to RELEASE.2025-10-15T17-29-55Z, a privilege escalation vulnerability allows service accounts and STS (Security Token Service) accounts with restricted session policies to bypass their inline policy restrictions when performing operations on their own account, specifically when creating new service accounts for the same user. The vulnerability exists in the IAM policy validation logic where the code incorrectly relied on the DenyOnly argument when validating session policies for restricted accounts. When a session policy is present, the system should validate that the action is allowed by the session policy, not just that it is not denied. An attacker with valid credentials for a restricted service or STS account can create a new service account for itself without policy restrictions, resulting in a new service account with full parent privileges instead of being restricted by the inline policy. This allows the attacker to access buckets and objects beyond their intended restrictions and modify, delete, or create objects outside their authorized scope. The vulnerability is fixed in version RELEASE.2025-10-15T17-29-55Z."
    },
    {
      "lang": "es",
      "value": "MinIO es un sistema de almacenamiento de objetos de alto rendimiento. En todas las versiones anteriores a RELEASE.2025-10-15T17-29-55Z, una vulnerabilidad de escalada de privilegios permite a las cuentas de servicio y a las cuentas STS (Security Token Service) con políticas de sesión restringidas eludir sus restricciones de política en línea al realizar operaciones en su propia cuenta, específicamente al crear nuevas cuentas de servicio para el mismo usuario. La vulnerabilidad existe en la lógica de validación de políticas de IAM donde el código se basó incorrectamente en el argumento DenyOnly al validar políticas de sesión para cuentas restringidas. Cuando una política de sesión está presente, el sistema debería validar que la acción está permitida por la política de sesión, no solo que no está denegada. Un atacante con credenciales válidas para una cuenta de servicio o STS restringida puede crear una nueva cuenta de servicio para sí mismo sin restricciones de política, lo que resulta en una nueva cuenta de servicio con privilegios parentales completos en lugar de estar restringida por la política en línea. Esto permite al atacante acceder a buckets y objetos más allá de sus restricciones previstas y modificar, eliminar o crear objetos fuera de su ámbito autorizado. La vulnerabilidad está corregida en la versión RELEASE.2025-10-15T17-29-55Z."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "minio",
          "product": "minio",
          "versions": [
            {
              "version": "< RELEASE.2025-10-15T17-29-55Z",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
          "baseScore": 8.1,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.2
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2025-10-17T13:51:46.931611Z",
          "id": "CVE-2025-62506",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-863"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/minio/minio/commit/c1a49490c78e9c3ebcad86ba0662319138ace190",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/minio/minio/pull/21642",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/minio/minio/security/advisories/GHSA-jjjj-jwhf-8rgr",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/minio/minio/discussions/21655",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://github.com/minio/minio/issues/21647",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://news.ycombinator.com/item?id=45684035",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ]
}