Vulnerability-Lookup

FKIE_CVE-2021-21706

Vulnerability from fkie_nvd - Published: 2021-10-04 04:15 - Updated: 2026-06-17 03:36

Severity

5.3 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N
6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Summary

In PHP versions 7.3.x below 7.3.31, 7.4.x below 7.4.24 and 8.0.x below 8.0.11, in Microsoft Windows environment, ZipArchive::extractTo may be tricked into writing a file outside target directory when extracting a ZIP file, thus potentially causing files to be created or overwritten, subject to OS permissions.

References

URL	Tags
security@php.net	https://bugs.php.net/bug.php?id=81420	Issue Tracking, Patch, Vendor Advisory
security@php.net	https://security.netapp.com/advisory/ntap-20211029-0007/	Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://bugs.php.net/bug.php?id=81420	Issue Tracking, Patch, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108	https://security.netapp.com/advisory/ntap-20211029-0007/	Third Party Advisory

Impacted products

Vendor	Product	Version
php	php	*
php	php	*
php	php	*
microsoft	windows	-

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "platforms": [
            "Windows"
          ],
          "product": "PHP",
          "vendor": "PHP Group",
          "versions": [
            {
              "lessThan": "7.3.31",
              "status": "affected",
              "version": "7.3.x",
              "versionType": "custom"
            },
            {
              "lessThan": "7.4.24",
              "status": "affected",
              "version": "7.4.x",
              "versionType": "custom"
            },
            {
              "lessThan": "8.0.11",
              "status": "affected",
              "version": "8.0.X",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "security@php.net"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:php:php:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "FB0C3B54-5557-4013-9453-CCAB94BF6A34",
              "versionEndExcluding": "7.3.31",
              "versionStartIncluding": "7.3.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:php:php:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "C714AE0D-1990-455D-BEA7-B3FF454DFEBF",
              "versionEndExcluding": "7.4.24",
              "versionStartIncluding": "7.4.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:php:php:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "35A8B10D-C9FF-474F-BEC1-196F6DDC4948",
              "versionEndExcluding": "8.0.11",
              "versionStartIncluding": "8.0.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        },
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*",
              "matchCriteriaId": "A2572D17-1DE6-457B-99CC-64AFD54487EA",
              "vulnerable": false
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ],
      "operator": "AND"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In PHP versions 7.3.x below 7.3.31, 7.4.x below 7.4.24 and 8.0.x below 8.0.11, in Microsoft Windows environment, ZipArchive::extractTo may be tricked into writing a file outside target directory when extracting a ZIP file, thus potentially causing files to be created or overwritten, subject to OS permissions."
    },
    {
      "lang": "es",
      "value": "En PHP versiones de 7.3.x por debajo de 7.3.31, versiones 7.4.x por debajo de 7.4.24 y 8.0.x por debajo de 8.0.11, en el entorno de Microsoft Windows, la funci\u00f3n ZipArchive::extractTo puede ser enga\u00f1ada para escribir un archivo fuera del directorio de destino cuando es extra\u00eddo un archivo ZIP, causando as\u00ed potencialmente una creaci\u00f3n o sobreescritura de archivos, sujeto a los permisos del Sistema Operativo"
    }
  ],
  "id": "CVE-2021-21706",
  "lastModified": "2026-06-17T03:36:02.040",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "MEDIUM",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "NONE",
          "baseScore": 4.3,
          "confidentialityImpact": "NONE",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N",
          "version": "2.0"
        },
        "exploitabilityScore": 8.6,
        "impactScore": 2.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": true
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 1.6,
        "impactScore": 3.6,
        "source": "security@php.net",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2021-10-04T04:15:08.350",
  "references": [
    {
      "source": "security@php.net",
      "tags": [
        "Issue Tracking",
        "Patch",
        "Vendor Advisory"
      ],
      "url": "https://bugs.php.net/bug.php?id=81420"
    },
    {
      "source": "security@php.net",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://security.netapp.com/advisory/ntap-20211029-0007/"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Issue Tracking",
        "Patch",
        "Vendor Advisory"
      ],
      "url": "https://bugs.php.net/bug.php?id=81420"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://security.netapp.com/advisory/ntap-20211029-0007/"
    }
  ],
  "sourceIdentifier": "security@php.net",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-24"
        }
      ],
      "source": "security@php.net",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2021-21706 (GCVE-0-2021-21706)

Vulnerability from cvelistv5 – Published: 2021-10-04 04:00 – Updated: 2024-09-16 23:06

Title

ZipArchive::extractTo may extract outside of destination dir

Summary

Severity

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N

CWE

CWE-24 - Path Traversal: '../filedir'

Assigner

php mitre root

References

2 references

URL	Tags
https://bugs.php.net/bug.php?id=81420	x_refsource_MISC
https://security.netapp.com/advisory/ntap-2021102…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
PHP Group	PHP	Affected: 7.3.x , < 7.3.31 (custom) Affected: 7.4.x , < 7.4.24 (custom) Affected: 8.0.X , < 8.0.11 (custom)

Date Public

2021-09-21 00:00

Credits

reported by vi at hackberry dot xyz

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T18:23:28.483Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://bugs.php.net/bug.php?id=81420"
          },
          {
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://security.netapp.com/advisory/ntap-20211029-0007/"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "platforms": [
            "Windows"
          ],
          "product": "PHP",
          "vendor": "PHP Group",
          "versions": [
            {
              "lessThan": "7.3.31",
              "status": "affected",
              "version": "7.3.x",
              "versionType": "custom"
            },
            {
              "lessThan": "7.4.24",
              "status": "affected",
              "version": "7.4.x",
              "versionType": "custom"
            },
            {
              "lessThan": "8.0.11",
              "status": "affected",
              "version": "8.0.X",
              "versionType": "custom"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "reported by vi at hackberry dot xyz"
        }
      ],
      "datePublic": "2021-09-21T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "In PHP versions 7.3.x below 7.3.31, 7.4.x below 7.4.24 and 8.0.x below 8.0.11, in Microsoft Windows environment, ZipArchive::extractTo may be tricked into writing a file outside target directory when extracting a ZIP file, thus potentially causing files to be created or overwritten, subject to OS permissions."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-24",
              "description": "CWE-24 Path Traversal: \u0027../filedir\u0027",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2021-10-29T12:06:47.000Z",
        "orgId": "dd77f84a-d19a-4638-8c3d-a322d820ed2b",
        "shortName": "php"
      },
      "references": [
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://bugs.php.net/bug.php?id=81420"
        },
        {
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://security.netapp.com/advisory/ntap-20211029-0007/"
        }
      ],
      "source": {
        "defect": [
          "https://bugs.php.net/bug.php?id=81420"
        ],
        "discovery": "EXTERNAL"
      },
      "title": "ZipArchive::extractTo may extract outside of destination dir",
      "x_generator": {
        "engine": "Vulnogram 0.0.9"
      },
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "security@php.net",
          "DATE_PUBLIC": "2021-09-21T11:32:00.000Z",
          "ID": "CVE-2021-21706",
          "STATE": "PUBLIC",
          "TITLE": "ZipArchive::extractTo may extract outside of destination dir"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "PHP",
                      "version": {
                        "version_data": [
                          {
                            "platform": "Windows",
                            "version_affected": "\u003c",
                            "version_name": "7.3.x",
                            "version_value": "7.3.31"
                          },
                          {
                            "platform": "Windows",
                            "version_affected": "\u003c",
                            "version_name": "7.4.x",
                            "version_value": "7.4.24"
                          },
                          {
                            "platform": "Windows",
                            "version_affected": "\u003c",
                            "version_name": "8.0.X",
                            "version_value": "8.0.11"
                          }
                        ]
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                    }
                  ]
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                "vendor_name": "PHP Group"
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        },
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            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N",
            "version": "3.1"
          }
        },
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                  "value": "CWE-24 Path Traversal: \u0027../filedir\u0027"
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        "references": {
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            },
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            }
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    "datePublished": "2021-10-04T04:00:17.182Z",
    "dateReserved": "2021-01-04T00:00:00.000Z",
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    "state": "PUBLISHED"
  },
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  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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FKIE_CVE-2021-21706

CVE-2021-21706 (GCVE-0-2021-21706)

Tags

Sightings

Nomenclature

Related by attack behaviour