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CVE-2018-18586

Estado: ModificadaMedia (5.3)—

chmextract.c in the chmextract sample program, as distributed with libmspack before 0.8alpha, does not protect against absolute/relative pathnames in CHM files, leading to Directory Traversal. NOTE: the vendor disputes that this is a libmspack vulnerability, because chmextract.c was only intended as a source-code example, not a supported application

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).

Tecnologías afectadas (1)

Kyzer — Libmspack

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2018-18586",
  "cveTags": [
    {
      "tags": [
        "disputed"
      ],
      "sourceIdentifier": "cve@mitre.org"
    }
  ],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:N",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV30": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.0",
          "baseScore": 5.3,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 1.4,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "cve@mitre.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ]
    }
  ],
  "published": "2018-10-23T02:29:00.700",
  "references": [
    {
      "url": "https://bugs.debian.org/911639",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "https://github.com/kyz/libmspack/commit/7cadd489698be117c47efcadd742651594429e6d",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "https://security.gentoo.org/glsa/201903-20",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "https://www.openwall.com/lists/oss-security/2018/10/22/1",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "https://bugs.debian.org/911639",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://github.com/kyz/libmspack/commit/7cadd489698be117c47efcadd742651594429e6d",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://security.gentoo.org/glsa/201903-20",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://www.openwall.com/lists/oss-security/2018/10/22/1",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "chmextract.c in the chmextract sample program, as distributed with libmspack before 0.8alpha, does not protect against absolute/relative pathnames in CHM files, leading to Directory Traversal. NOTE: the vendor disputes that this is a libmspack vulnerability, because chmextract.c was only intended as a source-code example, not a supported application"
    },
    {
      "lang": "es",
      "value": "** EN DISPUTA ** chmextract.c en el programa de muestra chmextract, tal y como se distribuye en libmspack en versiones anteriores a la 0.8alpha, no protege contra nombres de ruta absoluta/relativa en archivos CHM, lo que conduce a un salto de directorio. NOTA: el fabricante discute que esto sea una vulnerabilidad en libmspack, ya que chmextract.c solo se diseñó como ejemplo de código abierto, no una aplicación soportada."
    }
  ],
  "lastModified": "2026-06-17T01:47:33.160",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:kyzer:libmspack:0.3:alpha:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "A8922C30-64ED-4C15-999E-58AB0812814C"
            },
            {
              "criteria": "cpe:2.3:a:kyzer:libmspack:0.4:alpha:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "979ED5F0-4DE8-4091-BFD5-CD98AFF2BB43"
            },
            {
              "criteria": "cpe:2.3:a:kyzer:libmspack:0.5:alpha:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "F9DBC30C-9FC0-4471-B63B-0E948E2569C6"
            },
            {
              "criteria": "cpe:2.3:a:kyzer:libmspack:0.6:alpha:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "880442E9-7E36-4A6E-AA77-2310750AE21E"
            },
            {
              "criteria": "cpe:2.3:a:kyzer:libmspack:0.7:alpha:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "BE5A7D47-85EC-4045-9FB4-369CCD4044B2"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "cve@mitre.org"
}