CVE-2025-57632

{
  "id": "CVE-2025-57632",
  "sourceIdentifier": "[email protected]",
  "published": "2025-09-25T20:15:35.237",
  "lastModified": "2026-11-05T23:10:00.150",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "libsmb2 6.2+ is vulnerable to Buffer Overflow. When processing SMB2 chained PDUs (NextCommand), libsmb2 repeatedly calls smb2_add_iovector() to append to a fixed-size iovec array without checking the upper bound of v->niov (SMB2_MAX_VECTORS=256). An attacker can craft responses with many chained PDUs to overflow v->niov and perform heap out-of-bounds writes, causing memory corruption, crashes, and potentially arbitrary code execution. The SMB2_OPLOCK_BREAK path bypasses message ID validation."
    },
    {
      "lang": "es",
      "value": "libsmb2 6.2+ es vulnerable a desbordamiento de búfer. Al procesar PDUs encadenadas de SMB2 (NextCommand), libsmb2 llama repetidamente a smb2_add_iovector() para añadir a un array iovec de tamaño fijo sin comprobar el límite superior de v -> niov (SMB2_MAX_VECTORS=256). Un atacante puede crear respuestas con muchas PDUs encadenadas para desbordar v -> niov y realizar escrituras fuera de límites en el heap, causando corrupción de memoria, bloqueos y potencialmente ejecución de código arbitrario. La ruta SMB2_OPLOCK_BREAK omite la validación del ID de mensaje."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "version": "n/a",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2025-09-26T20:13:50.798924Z",
          "id": "CVE-2025-57632",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-120"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://gist.github.com/ZjW1nd/0b95b63307ceee7890e88e4abc6f041e",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/sahlberg/libsmb2",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/sahlberg/libsmb2/blob/master/lib/compat.c#L569",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/sahlberg/libsmb2/commit/5e75eebf922b338cdb548d60cffb3b997d2a12e8",
      "source": "[email protected]"
    }
  ]
}