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CVE-2019-3556

Estado: ModificadaAlta (8.1)—

HHVM supports the use of an "admin" server which accepts administrative requests over HTTP. One of those request handlers, dump-pcre-cache, can be used to output cached regular expressions from the current execution context into a file. The handler takes a parameter which specifies where on the filesystem to write this data. The parameter is not validated, allowing a malicious user to overwrite arbitrary files where the user running HHVM has write access. This issue affects HHVM versions prior to 4.56.2, all versions between 4.57.0 and 4.78.0, as well as 4.79.0, 4.80.0, 4.81.0, 4.82.0, and 4.83.0.

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)

Facebook — Hhvm

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2019-3556",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 5.5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:S/C:N/I:P/A:P",
          "authentication": "SINGLE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 4.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 8.1,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 5.2,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "cve-assign@fb.com",
      "affectedData": [
        {
          "vendor": "Facebook",
          "product": "HHVM",
          "versions": [
            {
              "status": "unaffected",
              "version": "4.83.1",
              "lessThan": "unspecified",
              "versionType": "custom"
            },
            {
              "status": "affected",
              "version": "4.83.0",
              "lessThan": "unspecified",
              "versionType": "custom"
            },
            {
              "status": "unaffected",
              "version": "4.82.1",
              "lessThan": "unspecified",
              "versionType": "custom"
            },
            {
              "status": "affected",
              "version": "4.82.0",
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              "versionType": "custom"
            },
            {
              "status": "unaffected",
              "version": "4.81.1",
              "lessThan": "unspecified",
              "versionType": "custom"
            },
            {
              "status": "affected",
              "version": "4.81.0",
              "lessThan": "unspecified",
              "versionType": "custom"
            },
            {
              "status": "unaffected",
              "version": "4.80.1",
              "lessThan": "unspecified",
              "versionType": "custom"
            },
            {
              "status": "affected",
              "version": "4.80.0",
              "lessThan": "unspecified",
              "versionType": "custom"
            },
            {
              "status": "unaffected",
              "version": "4.79.1",
              "lessThan": "unspecified",
              "versionType": "custom"
            },
            {
              "status": "affected",
              "version": "4.79.0",
              "lessThan": "unspecified",
              "versionType": "custom"
            },
            {
              "status": "unaffected",
              "version": "4.78.1",
              "lessThan": "unspecified",
              "versionType": "custom"
            },
            {
              "status": "affected",
              "version": "4.57.0",
              "lessThan": "unspecified",
              "versionType": "custom"
            },
            {
              "status": "unaffected",
              "version": "4.56.2",
              "lessThan": "unspecified",
              "versionType": "custom"
            },
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              "status": "affected",
              "version": "unspecified",
              "lessThan": "4.56.2",
              "versionType": "custom"
            }
          ]
        }
      ]
    }
  ],
  "published": "2021-10-26T20:15:07.603",
  "references": [
    {
      "url": "https://github.com/facebook/hhvm/commit/abe0b29e4d3a610f9bc920b8be4ad8403364c2d4",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "source": "cve-assign@fb.com"
    },
    {
      "url": "https://hhvm.com/blog/2020/11/12/security-update.html",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "cve-assign@fb.com"
    },
    {
      "url": "https://www.facebook.com/security/advisories/cve-2019-3556",
      "tags": [
        "Broken Link"
      ],
      "source": "cve-assign@fb.com"
    },
    {
      "url": "https://github.com/facebook/hhvm/commit/abe0b29e4d3a610f9bc920b8be4ad8403364c2d4",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://hhvm.com/blog/2020/11/12/security-update.html",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://www.facebook.com/security/advisories/cve-2019-3556",
      "tags": [
        "Broken Link"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "cve-assign@fb.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "HHVM supports the use of an \"admin\" server which accepts administrative requests over HTTP. One of those request handlers, dump-pcre-cache, can be used to output cached regular expressions from the current execution context into a file. The handler takes a parameter which specifies where on the filesystem to write this data. The parameter is not validated, allowing a malicious user to overwrite arbitrary files where the user running HHVM has write access. This issue affects HHVM versions prior to 4.56.2, all versions between 4.57.0 and 4.78.0, as well as 4.79.0, 4.80.0, 4.81.0, 4.82.0, and 4.83.0."
    },
    {
      "lang": "es",
      "value": "HHVM soporta el uso de un servidor \"admin\" que acepta peticiones administrativas sobre HTTP. Uno de esos manejadores de peticiones, dump-pcre-cache, puede ser usado para dar salida a las expresiones regulares en caché del contexto de ejecución actual en un archivo. El manejador toma un parámetro que especifica en qué parte del sistema de archivos es debido escribir estos datos. El parámetro no es comprobado, permitiendo a un usuario malicioso sobrescribir archivos arbitrarios en los que el usuario que ejecuta HHVM presenta acceso de escritura. Este problema afecta a las versiones de HHVM anteriores a 4.56.2, a todas las versiones entre la 4.57.0 y la 4.78.0, así como a las versiones 4.79.0, 4.80.0, 4.81.0, 4.82.0 y 4.83.0"
    }
  ],
  "lastModified": "2026-06-17T02:35:13.310",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "criteria": "cpe:2.3:a:facebook:hhvm:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "6711FFC9-F4D3-438B-B596-30FCB4EAF015",
              "versionEndExcluding": "4.56.2"
            },
            {
              "criteria": "cpe:2.3:a:facebook:hhvm:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "822519E7-63E6-45A1-B776-5AEFC7810A1E",
              "versionEndIncluding": "4.78.0",
              "versionStartIncluding": "4.57.0"
            },
            {
              "criteria": "cpe:2.3:a:facebook:hhvm:4.79.0:*:*:*:*:*:*:*",
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              "matchCriteriaId": "0C83AAFF-2886-424B-A9BD-251B3AAC790B"
            },
            {
              "criteria": "cpe:2.3:a:facebook:hhvm:4.80.0:*:*:*:*:*:*:*",
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              "matchCriteriaId": "73B27B4A-CD40-4493-BDCD-27F6ADD6C65A"
            },
            {
              "criteria": "cpe:2.3:a:facebook:hhvm:4.81.0:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "5BD9447B-B287-484B-A14C-787F8481EBB8"
            },
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              "vulnerable": true,
              "matchCriteriaId": "15825F25-22B8-4863-A4E0-AD2EE66FA12C"
            },
            {
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              "vulnerable": true,
              "matchCriteriaId": "A04923E1-4DCE-4E34-8238-99BCCEEF4791"
            }
          ],
          "operator": "OR"
        }
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    }
  ],
  "sourceIdentifier": "cve-assign@fb.com"
}