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CVE-2017-18264

Estado: ModificadaCrítica (9.8)—

Se ha descubierto un problema en libraries/common.inc.php en phpMyAdmin en versiones 4.0 anteriores a la 4.0.10.20, 4.4.x, 4.6.x y 4.7.0 "prereleases". Las restricciones causadas por $cfg['Servers'][$i]['AllowNoPassword'] = false se omiten en determinadas versiones PHP (por ejemplo, la versión 5). Esto puede permitir que inicien sesión los usuarios que no tengan una contraseña establecida incluso si el administrador tiene establecido $cfg['Servers'][$i]['AllowNoPassword'] en "false" (que es también el valor por defecto). Esto ocurre porque determinadas implementaciones de la función de PHP substr devuelven el valor "falso" cuando se proporciona el carácter " como primer argumento.

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 (2)

Debian — Debian LinuxPhpmyadmin — Phpmyadmin

CWE

Referencias

JSON original (NVD)

Mostrar
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  "id": "CVE-2017-18264",
  "cveTags": [],
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        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
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          "baseScore": 7.5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": true,
        "impactScore": 6.4,
        "baseSeverity": "HIGH",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
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          "scope": "UNCHANGED",
          "version": "3.0",
          "baseScore": 9.8,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
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        "impactScore": 5.9,
        "exploitabilityScore": 3.9
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  "affected": [
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      "source": "cve@mitre.org",
      "affectedData": [
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          "vendor": "n/a",
          "product": "n/a",
          "versions": [
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              "status": "affected",
              "version": "n/a"
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  "published": "2018-05-01T17:29:00.237",
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      "url": "http://www.securityfocus.com/bid/97211",
      "tags": [
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        "VDB Entry"
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      "source": "cve@mitre.org"
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      "tags": [
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      "source": "cve@mitre.org"
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      "tags": [
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  "vulnStatus": "Modified",
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      "description": [
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      "value": "An issue was discovered in libraries/common.inc.php in phpMyAdmin 4.0 before 4.0.10.20, 4.4.x, 4.6.x, and 4.7.0 prereleases. The restrictions caused by $cfg['Servers'][$i]['AllowNoPassword'] = false are bypassed under certain PHP versions (e.g., version 5). This can allow the login of users who have no password set even if the administrator has set $cfg['Servers'][$i]['AllowNoPassword'] to false (which is also the default). This occurs because some implementations of the PHP substr function return false when given '' as the first argument."
    },
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      "lang": "es",
      "value": "Se ha descubierto un problema en libraries/common.inc.php en phpMyAdmin en versiones 4.0 anteriores a la 4.0.10.20, 4.4.x, 4.6.x y 4.7.0 \"prereleases\". Las restricciones causadas por $cfg['Servers'][$i]['AllowNoPassword'] = false se omiten en determinadas versiones PHP (por ejemplo, la versión 5). Esto puede permitir que inicien sesión los usuarios que no tengan una contraseña establecida incluso si el administrador tiene establecido $cfg['Servers'][$i]['AllowNoPassword'] en \"false\" (que es también el valor por defecto). Esto ocurre porque determinadas implementaciones de la función de PHP substr devuelven el valor \"falso\" cuando se proporciona el carácter \" como primer argumento."
    }
  ],
  "lastModified": "2026-06-17T01:12:30.457",
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