Vulnerability-Lookup

OESA-2022-1902 (CVE-2021-4217)

Vulnerability from osv_openeuler – Published: 2022-09-09 11:05 – Updated: 2026-08-06 11:05 – Source website

Summary

unzip security update

Details

UnZip is an extraction utility for archives compressed in .zip format. UnZip will list, test, or extract files from a .zip archive, commonly found on MS-DOS systems. The default behavior (with no options) is to extract all files into the current directory (and subdirectorie below it) from the specified zipfile.

Security Fix(es):

A flaw was found in unzip. The vulnerability occurs due to improper handling of Unicode strings, which can lead to a null pointer dereference. This flaw allows an attacker to input a specially crafted zip file, leading to a crash or code execution.(CVE-2021-4217)

Severity

4.7 (Medium)


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

References

URL

Type

	https://www.openeuler.org/en/security/safety-bull…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2021-4217	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "unzip-debugsource-6.0-47.oe1.aarch64.rpm",
          "unzip-help-6.0-47.oe1.aarch64.rpm",
          "unzip-6.0-47.oe1.aarch64.rpm",
          "unzip-debuginfo-6.0-47.oe1.aarch64.rpm"
        ],
        "src": [
          "unzip-6.0-47.oe1.src.rpm"
        ],
        "x86_64": [
          "unzip-debuginfo-6.0-47.oe1.x86_64.rpm",
          "unzip-6.0-47.oe1.x86_64.rpm",
          "unzip-help-6.0-47.oe1.x86_64.rpm",
          "unzip-debugsource-6.0-47.oe1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP1",
        "name": "unzip",
        "purl": "pkg:rpm/openEuler/unzip\u0026distro=openEuler-20.03-LTS-SP1"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.0-47.oe1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "unzip-help-6.0-47.oe1.aarch64.rpm",
          "unzip-6.0-47.oe1.aarch64.rpm",
          "unzip-debuginfo-6.0-47.oe1.aarch64.rpm",
          "unzip-debugsource-6.0-47.oe1.aarch64.rpm"
        ],
        "src": [
          "unzip-6.0-47.oe1.src.rpm"
        ],
        "x86_64": [
          "unzip-debuginfo-6.0-47.oe1.x86_64.rpm",
          "unzip-6.0-47.oe1.x86_64.rpm",
          "unzip-debugsource-6.0-47.oe1.x86_64.rpm",
          "unzip-help-6.0-47.oe1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP3",
        "name": "unzip",
        "purl": "pkg:rpm/openEuler/unzip\u0026distro=openEuler-20.03-LTS-SP3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.0-47.oe1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "unzip-help-6.0-50.oe2203.aarch64.rpm",
          "unzip-6.0-50.oe2203.aarch64.rpm",
          "unzip-debuginfo-6.0-50.oe2203.aarch64.rpm",
          "unzip-debugsource-6.0-50.oe2203.aarch64.rpm"
        ],
        "src": [
          "unzip-6.0-50.oe2203.src.rpm"
        ],
        "x86_64": [
          "unzip-debuginfo-6.0-50.oe2203.x86_64.rpm",
          "unzip-6.0-50.oe2203.x86_64.rpm",
          "unzip-help-6.0-50.oe2203.x86_64.rpm",
          "unzip-debugsource-6.0-50.oe2203.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:22.03-LTS",
        "name": "unzip",
        "purl": "pkg:rpm/openEuler/unzip\u0026distro=openEuler-22.03-LTS"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.0-50.oe2203"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "High"
  },
  "details": "UnZip is an extraction utility for archives compressed in .zip format. UnZip will list, test, or extract files from a .zip archive, commonly found on MS-DOS systems. The default behavior (with no options) is to extract all files into the current directory (and subdirectorie below it) from the specified zipfile.\r\n\r\nSecurity Fix(es):\r\n\r\nA flaw was found in unzip. The vulnerability occurs due to improper handling of Unicode strings, which can lead to a null pointer dereference. This flaw allows an attacker to input a specially crafted zip file, leading to a crash or code execution.(CVE-2021-4217)",
  "id": "OESA-2022-1902",
  "modified": "2026-08-06T11:05:11Z",
  "published": "2022-09-09T11:05:11Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2022-1902"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-4217"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "unzip security update",
  "upstream": [
    "CVE-2021-4217"
  ]
}

CVE-2021-4217 (GCVE-0-2021-4217)

Vulnerability from cvelistv5 – Published: 2022-08-24 15:08 – Updated: 2024-08-03 17:16

Summary

Severity

No CVSS data available.

CWE

CWE-476 - - NULL Pointer Dereference

Assigner

redhat redhat root

References

3 references

URL	Tags
https://bugs.launchpad.net/ubuntu/+source/unzip/+…	x_refsource_MISC
https://bugzilla.redhat.com/show_bug.cgi?id=2044583	x_refsource_MISC
https://access.redhat.com/security/cve/CVE-2021-4217	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
n/a	unzip	Affected: unzip 6.0

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T17:16:04.487Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://bugs.launchpad.net/ubuntu/+source/unzip/+bug/1957077"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2044583"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://access.redhat.com/security/cve/CVE-2021-4217"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "unzip",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "unzip 6.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A flaw was found in unzip. The vulnerability occurs due to improper handling of Unicode strings, which can lead to a null pointer dereference. This flaw allows an attacker to input a specially crafted zip file, leading to a crash or code execution."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-476",
              "description": "CWE-476 - NULL Pointer Dereference",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2022-08-24T15:08:43.000Z",
        "orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
        "shortName": "redhat"
      },
      "references": [
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://bugs.launchpad.net/ubuntu/+source/unzip/+bug/1957077"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2044583"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://access.redhat.com/security/cve/CVE-2021-4217"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
    "assignerShortName": "redhat",
    "cveId": "CVE-2021-4217",
    "datePublished": "2022-08-24T15:08:43.000Z",
    "dateReserved": "2022-01-27T00:00:00.000Z",
    "dateUpdated": "2024-08-03T17:16:04.487Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "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.

Detection rules are retrieved from Rulezet.

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.