« Volver al listado

CVE-2025-7027

Estado: AplazadaAlta (8.2)—

A vulnerability in the Software SMI handler (SwSmiInputValue 0xB2) allows a local attacker to control both the read and write addresses used by the CommandRcx1 function. The write target is derived from an unvalidated UEFI NVRAM variable (SetupXtuBufferAddress), while the write content is read from an attacker-controlled pointer based on the RBX register. This dual-pointer dereference enables arbitrary memory writes within System Management RAM (SMRAM), leading to potential SMM privilege escalation and firmware compromise.

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vulnerabilidad local (AV:L, PR:H) que permite escritura arbitraria en SMRAM y escalada de privilegios SMM. Requiere acceso local con privilegios altos pero logra control de firmware.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Execution PreventionUpdate SoftwareThreat Intelligence ProgramPrivileged Account ManagementBoot IntegrityApplication Isolation and Sandboxing

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2025-7027",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-7027",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2025-07-12T03:55:16.831604Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 8.2,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "HIGH",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 6,
        "exploitabilityScore": 1.5
      }
    ]
  },
  "affected": [
    {
      "source": "cret@cert.org",
      "affectedData": [
        {
          "vendor": "GIGABYTE",
          "product": "UEFI-GenericComponentSmmEntry",
          "versions": [
            {
              "status": "affected",
              "version": "1.0.0"
            }
          ]
        }
      ]
    }
  ],
  "published": "2025-07-11T16:15:27.053",
  "references": [
    {
      "url": "https://kb.cert.org/vuls/id/746790",
      "source": "cret@cert.org"
    },
    {
      "url": "https://www.binarly.io/advisories/brly-2025-009",
      "source": "cret@cert.org"
    },
    {
      "url": "https://www.gigabyte.com/Support/Security",
      "source": "cret@cert.org"
    },
    {
      "url": "https://www.kb.cert.org/vuls/id/746790",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Deferred",
  "descriptions": [
    {
      "lang": "en",
      "value": "A vulnerability in the Software SMI handler (SwSmiInputValue 0xB2) allows a local attacker to control both the read and write addresses used by the CommandRcx1 function. The write target is derived from an unvalidated UEFI NVRAM variable (SetupXtuBufferAddress), while the write content is read from an attacker-controlled pointer based on the RBX register. This dual-pointer dereference enables arbitrary memory writes within System Management RAM (SMRAM), leading to potential SMM privilege escalation and firmware compromise."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad en el controlador Software SMI (SwSmiInputValue 0xB2) permite a un atacante local controlar las direcciones de lectura y escritura utilizadas por la función CommandRcx1. El objetivo de escritura se deriva de una variable NVRAM UEFI no validada (SetupXtuBufferAddress), mientras que el contenido de escritura se lee desde un puntero controlado por el atacante basado en el registro RBX. Esta desreferencia de puntero dual permite escrituras arbitrarias en la memoria RAM de administración del sistema (SMRAM), lo que puede provocar una escalada de privilegios de SMM y comprometer el firmware."
    }
  ],
  "lastModified": "2026-06-17T10:04:07.467",
  "sourceIdentifier": "cret@cert.org"
}