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CVE-2009-0641

Estado: ModificadaAlta (9.3)—💥 Exploit

sys_term.c in telnetd in FreeBSD 7.0-RELEASE and other 7.x versions deletes dangerous environment variables with a method that was valid only in older FreeBSD distributions, which might allow remote attackers to execute arbitrary code by passing a crafted environment variable from a telnet client, as demonstrated by an LD_PRELOAD value that references a malicious library.

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).

💥 Exploits públicos

Hay código de explotación o plantillas de detección públicos. No es lo mismo que explotación activa confirmada (KEV), pero aumenta el riesgo: parchee con prioridad.

Tecnologías afectadas (1)

Freebsd — Freebsd

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2009-0641",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 9.3,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:C/I:C/A:C",
          "authentication": "NONE",
          "integrityImpact": "COMPLETE",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "COMPLETE",
          "confidentialityImpact": "COMPLETE"
        },
        "acInsufInfo": false,
        "impactScore": 10,
        "baseSeverity": "HIGH",
        "obtainAllPrivilege": true,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ]
  },
  "affected": [
    {
      "source": "cve@mitre.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ]
    }
  ],
  "published": "2009-02-20T06:47:48.250",
  "references": [
    {
      "url": "http://lists.grok.org.uk/pipermail/full-disclosure/2009-February/067954.html",
      "tags": [
        "Exploit"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "http://security.freebsd.org/advisories/FreeBSD-SA-09:05.telnetd.asc",
      "tags": [
        "Patch"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "http://www.securityfocus.com/bid/33777",
      "tags": [
        "Exploit"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/48780",
      "source": "cve@mitre.org"
    },
    {
      "url": "https://www.exploit-db.com/exploits/8055",
      "source": "cve@mitre.org"
    },
    {
      "url": "http://lists.grok.org.uk/pipermail/full-disclosure/2009-February/067954.html",
      "tags": [
        "Exploit"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://security.freebsd.org/advisories/FreeBSD-SA-09:05.telnetd.asc",
      "tags": [
        "Patch"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.securityfocus.com/bid/33777",
      "tags": [
        "Exploit"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/48780",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://www.exploit-db.com/exploits/8055",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-16"
        },
        {
          "lang": "en",
          "value": "CWE-264"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "sys_term.c in telnetd in FreeBSD 7.0-RELEASE and other 7.x versions deletes dangerous environment variables with a method that was valid only in older FreeBSD distributions, which might allow remote attackers to execute arbitrary code by passing a crafted environment variable from a telnet client, as demonstrated by an LD_PRELOAD value that references a malicious library."
    },
    {
      "lang": "es",
      "value": "sys_term.c en telnetd en FreeBSD v7.0-RELEASE y otras v7.x borra variables de entorno peligrosas con un método que solo fue valido en distribuciones antiguas de FreeBSD, lo que permite a atacantes remotos ejecutar código de su elección a través de un cliente de telnet de una variable de entorno manipulada, como se demuestra mediante el valor LD_PRELOAD que hace referencia a una librería maliciosa."
    }
  ],
  "lastModified": "2026-06-16T23:05:28.637",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "criteria": "cpe:2.3:o:freebsd:freebsd:7.0:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "47E0A416-733A-4616-AE08-150D67FCEA70"
            },
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              "vulnerable": true,
              "matchCriteriaId": "CDFA5AA9-E73F-448D-9754-41AF9AECB93A"
            },
            {
              "criteria": "cpe:2.3:o:freebsd:freebsd:7.0:current:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "C4E775BA-6DC1-4006-83A4-D30EA57417FC"
            },
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              "matchCriteriaId": "EC290462-4364-464F-8CE9-6F5E5BE6F246"
            },
            {
              "criteria": "cpe:2.3:o:freebsd:freebsd:7.0_beta4:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "F06B831E-D8F2-4380-B279-559CE103210F"
            },
            {
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              "vulnerable": true,
              "matchCriteriaId": "3ACC9072-4A33-4F1F-B790-2F9D5A52F71B"
            },
            {
              "criteria": "cpe:2.3:o:freebsd:freebsd:7.1:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "803EFA9F-B7CB-4511-B1C1-381170CA9A23"
            },
            {
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              "matchCriteriaId": "52DBF406-9C77-4DDA-AB7D-40FAE40023D0"
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          ],
          "operator": "OR"
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  "sourceIdentifier": "cve@mitre.org"
}