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CVE-2017-13720

Estado: ModificadaAlta (7.1)—

In the PatternMatch function in fontfile/fontdir.c in libXfont through 1.5.2 and 2.x before 2.0.2, an attacker with access to an X connection can cause a buffer over-read during pattern matching of fonts, leading to information disclosure or a crash (denial of service). This occurs because '\0' characters are incorrectly skipped in situations involving ? characters.

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)

X.org — Libxfont

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2017-13720",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 3.6,
          "accessVector": "LOCAL",
          "vectorString": "AV:L/AC:L/Au:N/C:P/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 4.9,
        "baseSeverity": "LOW",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 3.9,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV30": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.0",
          "baseScore": 7.1,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.2,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "cve@mitre.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
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  ],
  "published": "2017-10-11T17:29:00.303",
  "references": [
    {
      "url": "http://www.debian.org/security/2017/dsa-3995",
      "source": "cve@mitre.org"
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      "tags": [
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    {
      "url": "https://bugzilla.suse.com/show_bug.cgi?id=1054285",
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    },
    {
      "url": "https://cgit.freedesktop.org/xorg/lib/libXfont/commit/?id=d1e670a4a8704b8708e493ab6155589bcd570608",
      "tags": [
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    {
      "url": "https://security.gentoo.org/glsa/201711-08",
      "source": "cve@mitre.org"
    },
    {
      "url": "https://www.x.org/releases/individual/lib/libXfont2-2.0.2.tar.bz2",
      "tags": [
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      "source": "cve@mitre.org"
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      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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    {
      "url": "https://cgit.freedesktop.org/xorg/lib/libXfont/commit/?id=d1e670a4a8704b8708e493ab6155589bcd570608",
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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    {
      "url": "https://www.x.org/releases/individual/lib/libXfont2-2.0.2.tar.bz2",
      "tags": [
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      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the PatternMatch function in fontfile/fontdir.c in libXfont through 1.5.2 and 2.x before 2.0.2, an attacker with access to an X connection can cause a buffer over-read during pattern matching of fonts, leading to information disclosure or a crash (denial of service). This occurs because '\\0' characters are incorrectly skipped in situations involving ? characters."
    },
    {
      "lang": "es",
      "value": "En la función PatternMatch en fontfile/fontdir.c en libXfont, en versiones hasta la 1.5.2 y versiones 2.x hasta la 2.0.2, un atacante con acceso a una conexión X puede provocar una sobrelectura de búfer durante una comparación de patrones de fuentes, lo que da lugar a una revelación de información o cierre inesperado (denegación de servicio). Esto ocurre porque se omiten de manera incorrecta los caracteres \"\\0\" en situaciones en las que existen caracteres ?."
    }
  ],
  "lastModified": "2026-06-17T01:05:03.030",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "versionEndIncluding": "1.5.2"
            },
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              "vulnerable": true,
              "matchCriteriaId": "B9D9133B-6806-4947-B43F-F13FE6FA1FE7"
            },
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              "vulnerable": true,
              "matchCriteriaId": "93F2E32E-A188-4EB6-929D-CF74271011C1"
            }
          ],
          "operator": "OR"
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  "sourceIdentifier": "cve@mitre.org"
}