FKIE_CVE-2025-57632

Vulnerability from fkie_nvd - Published: 2025-09-25 20:15 - Updated: 2025-09-26 21:15
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
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.
References
cve@mitre.orghttps://gist.github.com/ZjW1nd/0b95b63307ceee7890e88e4abc6f041e
cve@mitre.orghttps://github.com/sahlberg/libsmb2
cve@mitre.orghttps://github.com/sahlberg/libsmb2/blob/master/lib/compat.c#L569
Impacted products
Vendor Product Version
To clipboard 

{
  "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-\u003eniov (SMB2_MAX_VECTORS=256). An attacker can craft responses with many chained PDUs to overflow v-\u003eniov 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."
    }
  ],
  "id": "CVE-2025-57632",
  "lastModified": "2025-09-26T21:15:37.017",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  },
  "published": "2025-09-25T20:15:35.237",
  "references": [
    {
      "source": "cve@mitre.org",
      "url": "https://gist.github.com/ZjW1nd/0b95b63307ceee7890e88e4abc6f041e"
    },
    {
      "source": "cve@mitre.org",
      "url": "https://github.com/sahlberg/libsmb2"
    },
    {
      "source": "cve@mitre.org",
      "url": "https://github.com/sahlberg/libsmb2/blob/master/lib/compat.c#L569"
    }
  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-120"
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
    }
  ]
}


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