Vulnerability-Lookup

OESA-2023-1008 (CVE-2021-33640)

Vulnerability from osv_openeuler – Published: 2023-01-06 11:05 – Updated: 2026-08-06 11:05 – Source website

Summary

libtar security update

Details

Libtar is a C library for manipulating POSIX tar files. It handles adding and extracting files to/from a tar archive. Requires gcc, make, and zlib.

Security Fix(es):

After tar_close(), libtar.c releases the memory pointed to by pointer t. After tar_close() is called in the list() function, it continues to use pointer t: free_longlink_longname(t->th_buf) . As a result, the released memory is used (use-after-free).(CVE-2021-33640)

Severity

6.2 (Medium)


                    
                      CVSS:3.1/AV:L/AC:L/PR:N/UI:N/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-2021-33640	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "libtar-debuginfo-1.2.20-22.oe2203sp1.aarch64.rpm",
          "libtar-debugsource-1.2.20-22.oe2203sp1.aarch64.rpm",
          "libtar-help-1.2.20-22.oe2203sp1.aarch64.rpm",
          "libtar-devel-1.2.20-22.oe2203sp1.aarch64.rpm",
          "libtar-1.2.20-22.oe2203sp1.aarch64.rpm"
        ],
        "src": [
          "libtar-1.2.20-22.oe2203sp1.src.rpm"
        ],
        "x86_64": [
          "libtar-help-1.2.20-22.oe2203sp1.x86_64.rpm",
          "libtar-devel-1.2.20-22.oe2203sp1.x86_64.rpm",
          "libtar-1.2.20-22.oe2203sp1.x86_64.rpm",
          "libtar-debugsource-1.2.20-22.oe2203sp1.x86_64.rpm",
          "libtar-debuginfo-1.2.20-22.oe2203sp1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:22.03-LTS-SP1",
        "name": "libtar",
        "purl": "pkg:rpm/openEuler/libtar\u0026distro=openEuler-22.03-LTS-SP1"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.2.20-22.oe2203sp1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "Medium"
  },
  "details": "Libtar is a C library for manipulating POSIX tar files. It handles adding and extracting files to/from a tar archive. Requires gcc, make, and zlib.\r\n\r\nSecurity Fix(es):\r\n\r\nAfter tar_close(), libtar.c releases the memory pointed to by pointer t. After tar_close() is called in the list() function, it continues to use pointer t: free_longlink_longname(t-\u0026gt;th_buf) . As a result, the released memory is used (use-after-free).(CVE-2021-33640)",
  "id": "OESA-2023-1008",
  "modified": "2026-08-06T11:05:29Z",
  "published": "2023-01-06T11:05:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2023-1008"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-33640"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "libtar security update",
  "upstream": [
    "CVE-2021-33640"
  ]
}

CVE-2021-33640 (GCVE-0-2021-33640)

Vulnerability from cvelistv5 – Published: 2022-12-19 00:00 – Updated: 2025-04-17 14:58

Summary

Severity

6.2 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-04-17 14:57 UTC

CWE

CWE-416 - Use After Free

Assigner

openEuler mitre root

References

3 references

URL	Tags
https://www.openeuler.org/en/security/cve/detail/…
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory

Impacted products

3 products

Vendor	Product	Version
openEuler	openEuler 22.03 LTS	Affected: libtar 1.2.20-21
openEuler	openEuler 20.03 LTS SP1	Affected: libtar 1.2.20-19
openEuler	openEuler 20.03 LTS SP3	Affected: libtar 1.2.20-19

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T23:58:21.909Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2021-33640\u0026packageName=libtar"
          },
          {
            "name": "FEDORA-2022-88772d0a2d",
            "tags": [
              "vendor-advisory",
              "x_transferred"
            ],
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4S4PJRCJLEAWN2EKXGLSOBTL7O57V7NC/"
          },
          {
            "name": "FEDORA-2022-ccc68b06cc",
            "tags": [
              "vendor-advisory",
              "x_transferred"
            ],
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7WX5YE66CT7Y5C2HTHXSFDKQWYWYWJ2T/"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2021-33640",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-04-17T14:57:23.132306Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-04-17T14:58:03.494Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "openEuler 22.03 LTS",
          "vendor": "openEuler",
          "versions": [
            {
              "status": "affected",
              "version": " libtar 1.2.20-21"
            }
          ]
        },
        {
          "product": "openEuler 20.03 LTS SP1",
          "vendor": "openEuler",
          "versions": [
            {
              "status": "affected",
              "version": " libtar 1.2.20-19"
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          ]
        },
        {
          "product": "openEuler 20.03 LTS SP3",
          "vendor": "openEuler",
          "versions": [
            {
              "status": "affected",
              "version": " libtar 1.2.20-19"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "After tar_close(), libtar.c releases the memory pointed to by pointer t. After tar_close() is called in the list() function, it continues to use pointer t: free_longlink_longname(t-\u003eth_buf) . As a result, the released memory is used (use-after-free)."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 6.2,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-416",
              "description": "CWE-416 Use After Free",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2022-12-28T00:00:00.000Z",
        "orgId": "7e1ac599-2767-43fa-b3ea-f10178cc98f2",
        "shortName": "openEuler"
      },
      "references": [
        {
          "url": "https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2021-33640\u0026packageName=libtar"
        },
        {
          "name": "FEDORA-2022-88772d0a2d",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4S4PJRCJLEAWN2EKXGLSOBTL7O57V7NC/"
        },
        {
          "name": "FEDORA-2022-ccc68b06cc",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7WX5YE66CT7Y5C2HTHXSFDKQWYWYWJ2T/"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "x_generator": {
        "engine": "Vulnogram 0.0.9"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "7e1ac599-2767-43fa-b3ea-f10178cc98f2",
    "assignerShortName": "openEuler",
    "cveId": "CVE-2021-33640",
    "datePublished": "2022-12-19T00:00:00.000Z",
    "dateReserved": "2021-05-28T00:00:00.000Z",
    "dateUpdated": "2025-04-17T14:58:03.494Z",
    "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.

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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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OESA-2023-1008 (CVE-2021-33640)

CVE-2021-33640 (GCVE-0-2021-33640)

Tags

Sightings

Nomenclature

Related by attack behaviour