Vulnerability-Lookup

oesa-2021-1313

Vulnerability from osv_openeuler

Published

2021-08-20 11:04

Modified

2026-08-06 11:04

Summary

c-ares security update

Details

This is c-ares, an asynchronous resolver library. It is intended for applications which need to perform DNS queries without blocking, or need to perform multiple.

Security Fix(es):

Missing input validation of host names returned by Domain Name Servers in the c-ares library can lead to output of wrong hostnames (leading to Domain Hijacking).(CVE-2021-3672)

Severity

5.0 (Medium)


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

References

URL

Type

	https://openeuler.org/en/security/safety-bulletin…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2021-3672	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "c-ares-debugsource-1.16.1-3.oe1.aarch64.rpm",
          "c-ares-debuginfo-1.16.1-3.oe1.aarch64.rpm",
          "c-ares-devel-1.16.1-3.oe1.aarch64.rpm",
          "c-ares-1.16.1-3.oe1.aarch64.rpm"
        ],
        "noarch": [
          "c-ares-help-1.16.1-3.oe1.noarch.rpm"
        ],
        "src": [
          "c-ares-1.16.1-3.oe1.src.rpm"
        ],
        "x86_64": [
          "c-ares-devel-1.16.1-3.oe1.x86_64.rpm",
          "c-ares-debugsource-1.16.1-3.oe1.x86_64.rpm",
          "c-ares-debuginfo-1.16.1-3.oe1.x86_64.rpm",
          "c-ares-1.16.1-3.oe1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP1",
        "name": "c-ares",
        "purl": "pkg:rpm/openEuler/c-ares\u0026distro=openEuler-20.03-LTS-SP1"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.16.1-3.oe1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "c-ares-debugsource-1.16.1-3.oe1.aarch64.rpm",
          "c-ares-debuginfo-1.16.1-3.oe1.aarch64.rpm",
          "c-ares-devel-1.16.1-3.oe1.aarch64.rpm",
          "c-ares-1.16.1-3.oe1.aarch64.rpm"
        ],
        "noarch": [
          "c-ares-help-1.16.1-3.oe1.noarch.rpm"
        ],
        "src": [
          "c-ares-1.16.1-3.oe1.src.rpm"
        ],
        "x86_64": [
          "c-ares-devel-1.16.1-3.oe1.x86_64.rpm",
          "c-ares-debugsource-1.16.1-3.oe1.x86_64.rpm",
          "c-ares-debuginfo-1.16.1-3.oe1.x86_64.rpm",
          "c-ares-1.16.1-3.oe1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP2",
        "name": "c-ares",
        "purl": "pkg:rpm/openEuler/c-ares\u0026distro=openEuler-20.03-LTS-SP2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.16.1-3.oe1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "Medium"
  },
  "details": "This is c-ares, an asynchronous resolver library. It is intended for applications which need to perform DNS queries without blocking, or need to perform multiple.\r\n\r\nSecurity Fix(es):\r\n\r\nMissing input validation of host names returned by Domain Name Servers in the c-ares library can lead to output of wrong hostnames (leading to Domain Hijacking).(CVE-2021-3672)",
  "id": "OESA-2021-1313",
  "modified": "2026-08-06T11:04:33Z",
  "published": "2021-08-20T11:04:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2021-1313"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-3672"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "c-ares security update",
  "upstream": [
    "CVE-2021-3672"
  ]
}

CVE-2021-3672 (GCVE-0-2021-3672)

Vulnerability from cvelistv5 – Published: 2021-11-23 00:00 – Updated: 2024-10-15 17:14

Summary

A flaw was found in c-ares library, where a missing input validation check of host names returned by DNS (Domain Name Servers) can lead to output of wrong hostnames which might potentially lead to Domain Hijacking. The highest threat from this vulnerability is to confidentiality and integrity as well as system availability.

Severity

No CVSS data available.

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-10-15 17:09 UTC

CWE

CWE-79

Assigner

redhat redhat root

References

5 references

URL	Tags
https://bugzilla.redhat.com/show_bug.cgi?id=1988342
https://c-ares.haxx.se/adv_20210810.html
https://cert-portal.siemens.com/productcert/pdf/s…
https://www.oracle.com/security-alerts/cpujul2022.html
https://security.gentoo.org/glsa/202401-02	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
n/a	c-ares	Affected: c-ares 1.17.2

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T17:01:07.975Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1988342"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://c-ares.haxx.se/adv_20210810.html"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://www.oracle.com/security-alerts/cpujul2022.html"
          },
          {
            "name": "GLSA-202401-02",
            "tags": [
              "vendor-advisory",
              "x_transferred"
            ],
            "url": "https://security.gentoo.org/glsa/202401-02"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2021-3672",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-10-15T17:09:33.511285Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-10-15T17:14:27.220Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "c-ares",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "c-ares 1.17.2"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A flaw was found in c-ares library, where a missing input validation check of host names returned by DNS (Domain Name Servers) can lead to output of wrong hostnames which might potentially lead to Domain Hijacking. The highest threat from this vulnerability is to confidentiality and integrity as well as system availability."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-79",
              "description": "CWE-79",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-01-05T10:06:20.709Z",
        "orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
        "shortName": "redhat"
      },
      "references": [
        {
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1988342"
        },
        {
          "url": "https://c-ares.haxx.se/adv_20210810.html"
        },
        {
          "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf"
        },
        {
          "url": "https://www.oracle.com/security-alerts/cpujul2022.html"
        },
        {
          "name": "GLSA-202401-02",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://security.gentoo.org/glsa/202401-02"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
    "assignerShortName": "redhat",
    "cveId": "CVE-2021-3672",
    "datePublished": "2021-11-23T00:00:00.000Z",
    "dateReserved": "2021-07-30T00:00:00.000Z",
    "dateUpdated": "2024-10-15T17:14:27.220Z",
    "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.