Vulnerability-Lookup

OESA-2023-1957 (CVE-2023-22742)

Vulnerability from osv_openeuler – Published: 2023-12-22 11:06 – Updated: 2026-08-06 11:06 – Source website

Summary

libgit2 security update

Details

libgit2 is a portable, pure C implementation of the Git core methods provided as a re-entrant linkable library with a solid API, allowing you to write native speed custom Git applications in any language which supports C bindings.

Security Fix(es):

libgit2 is a cross-platform, linkable library implementation of Git. When using an SSH remote with the optional libssh2 backend, libgit2 does not perform certificate checking by default. Prior versions of libgit2 require the caller to set the certificate_check field of libgit2's git_remote_callbacks structure - if a certificate check callback is not set, libgit2 does not perform any certificate checking. This means that by default - without configuring a certificate check callback, clients will not perform validation on the server SSH keys and may be subject to a man-in-the-middle attack. Users are encouraged to upgrade to v1.4.5 or v1.5.1. Users unable to upgrade should ensure that all relevant certificates are manually checked.(CVE-2023-22742)

Severity

5.9 (Medium)


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

References

URL

Type

	https://www.openeuler.org/en/security/safety-bull…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2023-22742	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "libgit2-0.27.8-7.oe1.aarch64.rpm",
          "libgit2-debuginfo-0.27.8-7.oe1.aarch64.rpm",
          "libgit2-debugsource-0.27.8-7.oe1.aarch64.rpm",
          "libgit2-devel-0.27.8-7.oe1.aarch64.rpm"
        ],
        "src": [
          "libgit2-0.27.8-7.oe1.src.rpm"
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          "libgit2-debuginfo-0.27.8-7.oe1.x86_64.rpm",
          "libgit2-devel-0.27.8-7.oe1.x86_64.rpm"
        ]
      },
      "package": {
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      },
      "ranges": [
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            },
            {
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    },
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          "libgit2-0.27.8-7.oe1.aarch64.rpm",
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        ],
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        ],
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          "libgit2-0.27.8-7.oe1.x86_64.rpm"
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      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP3",
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      },
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          "events": [
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            }
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    },
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      "ecosystem_specific": {
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          "libgit2-debugsource-0.27.8-7.oe2003sp4.aarch64.rpm",
          "libgit2-devel-0.27.8-7.oe2003sp4.aarch64.rpm",
          "libgit2-0.27.8-7.oe2003sp4.aarch64.rpm"
        ],
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        ],
        "x86_64": [
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          "libgit2-debuginfo-0.27.8-7.oe2003sp4.x86_64.rpm",
          "libgit2-devel-0.27.8-7.oe2003sp4.x86_64.rpm",
          "libgit2-debugsource-0.27.8-7.oe2003sp4.x86_64.rpm"
        ]
      },
      "package": {
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      },
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        {
          "events": [
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              "introduced": "0"
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            }
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          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
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          "libgit2-debuginfo-0.27.8-6.oe2203.aarch64.rpm",
          "libgit2-debugsource-0.27.8-6.oe2203.aarch64.rpm",
          "libgit2-devel-0.27.8-6.oe2203.aarch64.rpm",
          "libgit2-1.3.2-2.oe2203sp1.aarch64.rpm",
          "libgit2-devel-1.3.2-2.oe2203sp1.aarch64.rpm",
          "libgit2-debuginfo-1.3.2-2.oe2203sp1.aarch64.rpm",
          "libgit2-debugsource-1.3.2-2.oe2203sp1.aarch64.rpm",
          "libgit2-devel-1.3.2-2.oe2203sp2.aarch64.rpm",
          "libgit2-debugsource-1.3.2-2.oe2203sp2.aarch64.rpm",
          "libgit2-debuginfo-1.3.2-2.oe2203sp2.aarch64.rpm",
          "libgit2-1.3.2-2.oe2203sp2.aarch64.rpm"
        ],
        "src": [
          "libgit2-0.27.8-6.oe2203.src.rpm",
          "libgit2-1.3.2-2.oe2203sp1.src.rpm",
          "libgit2-1.3.2-2.oe2203sp2.src.rpm"
        ],
        "x86_64": [
          "libgit2-debuginfo-0.27.8-6.oe2203.x86_64.rpm",
          "libgit2-devel-0.27.8-6.oe2203.x86_64.rpm",
          "libgit2-0.27.8-6.oe2203.x86_64.rpm",
          "libgit2-debugsource-0.27.8-6.oe2203.x86_64.rpm",
          "libgit2-devel-1.3.2-2.oe2203sp1.x86_64.rpm",
          "libgit2-1.3.2-2.oe2203sp1.x86_64.rpm",
          "libgit2-debugsource-1.3.2-2.oe2203sp1.x86_64.rpm",
          "libgit2-debuginfo-1.3.2-2.oe2203sp1.x86_64.rpm",
          "libgit2-devel-1.3.2-2.oe2203sp2.x86_64.rpm",
          "libgit2-debugsource-1.3.2-2.oe2203sp2.x86_64.rpm",
          "libgit2-debuginfo-1.3.2-2.oe2203sp2.x86_64.rpm",
          "libgit2-1.3.2-2.oe2203sp2.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:22.03-LTS",
        "name": "libgit2",
        "purl": "pkg:rpm/openEuler/libgit2\u0026distro=openEuler-22.03-LTS"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.3.2-2.oe2203sp2"
            }
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          "type": "ECOSYSTEM"
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    },
    {
      "ecosystem_specific": {
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          "libgit2-1.3.2-2.oe2203sp1.aarch64.rpm",
          "libgit2-devel-1.3.2-2.oe2203sp1.aarch64.rpm",
          "libgit2-debuginfo-1.3.2-2.oe2203sp1.aarch64.rpm",
          "libgit2-debugsource-1.3.2-2.oe2203sp1.aarch64.rpm"
        ],
        "src": [
          "libgit2-1.3.2-2.oe2203sp1.src.rpm"
        ],
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          "libgit2-devel-1.3.2-2.oe2203sp1.x86_64.rpm",
          "libgit2-1.3.2-2.oe2203sp1.x86_64.rpm",
          "libgit2-debugsource-1.3.2-2.oe2203sp1.x86_64.rpm",
          "libgit2-debuginfo-1.3.2-2.oe2203sp1.x86_64.rpm"
        ]
      },
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        "purl": "pkg:rpm/openEuler/libgit2\u0026distro=openEuler-22.03-LTS-SP1"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.3.2-2.oe2203sp1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "libgit2-devel-1.3.2-2.oe2203sp2.aarch64.rpm",
          "libgit2-debugsource-1.3.2-2.oe2203sp2.aarch64.rpm",
          "libgit2-debuginfo-1.3.2-2.oe2203sp2.aarch64.rpm",
          "libgit2-1.3.2-2.oe2203sp2.aarch64.rpm"
        ],
        "src": [
          "libgit2-1.3.2-2.oe2203sp2.src.rpm"
        ],
        "x86_64": [
          "libgit2-devel-1.3.2-2.oe2203sp2.x86_64.rpm",
          "libgit2-debugsource-1.3.2-2.oe2203sp2.x86_64.rpm",
          "libgit2-debuginfo-1.3.2-2.oe2203sp2.x86_64.rpm",
          "libgit2-1.3.2-2.oe2203sp2.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:22.03-LTS-SP2",
        "name": "libgit2",
        "purl": "pkg:rpm/openEuler/libgit2\u0026distro=openEuler-22.03-LTS-SP2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.3.2-2.oe2203sp2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "Medium"
  },
  "details": "libgit2 is a portable, pure C implementation of the Git core methods provided as a re-entrant linkable library with a solid API, allowing you to write native speed custom Git applications in any language which supports C bindings.\r\n\r\nSecurity Fix(es):\r\n\r\nlibgit2 is a cross-platform, linkable library implementation of Git. When using an SSH remote with the optional libssh2 backend, libgit2 does not perform certificate checking by default. Prior versions of libgit2 require the caller to set the `certificate_check` field of libgit2\u0026apos;s `git_remote_callbacks` structure - if a certificate check callback is not set, libgit2 does not perform any certificate checking. This means that by default - without configuring a certificate check callback, clients will not perform validation on the server SSH keys and may be subject to a man-in-the-middle attack. Users are encouraged to upgrade to v1.4.5 or v1.5.1. Users unable to upgrade should ensure that all relevant certificates are manually checked.(CVE-2023-22742)",
  "id": "OESA-2023-1957",
  "modified": "2026-08-06T11:06:24Z",
  "published": "2023-12-22T11:06:24Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2023-1957"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-22742"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "libgit2 security update",
  "upstream": [
    "CVE-2023-22742"
  ]
}

CVE-2023-22742 (GCVE-0-2023-22742)

Vulnerability from cvelistv5 – Published: 2023-01-20 22:49 – Updated: 2025-03-10 21:21

Title

libgit2 fails to verify SSH keys by default

Summary

libgit2 is a cross-platform, linkable library implementation of Git. When using an SSH remote with the optional libssh2 backend, libgit2 does not perform certificate checking by default. Prior versions of libgit2 require the caller to set the `certificate_check` field of libgit2's `git_remote_callbacks` structure - if a certificate check callback is not set, libgit2 does not perform any certificate checking. This means that by default - without configuring a certificate check callback, clients will not perform validation on the server SSH keys and may be subject to a man-in-the-middle attack. Users are encouraged to upgrade to v1.4.5 or v1.5.1. Users unable to upgrade should ensure that all relevant certificates are manually checked.

Severity

5.3 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-03-10 20:59 UTC

CWE

CWE-347 - Improper Verification of Cryptographic Signature

Assigner

GitHub_M mitre root

References

7 references

URL	Tags
https://github.com/libgit2/libgit2/security/advis…	x_refsource_CONFIRM
https://github.com/libgit2/libgit2/commit/42e5db9…	x_refsource_MISC
https://github.com/libgit2/libgit2/commit/cd6f679…	x_refsource_MISC
https://github.com/libgit2/libgit2/releases/tag/v1.4.5	x_refsource_MISC
https://github.com/libgit2/libgit2/releases/tag/v1.5.1	x_refsource_MISC
https://www.libssh2.org	x_refsource_MISC
http://www.openwall.com/lists/oss-security/2023/11/06/5

Impacted products

1 product

Vendor	Product	Version
libgit2	libgit2	Affected: < 1.4.5 Affected: = 1.5.0

Show details on NVD website

JSON

To clipboard

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        "providerMetadata": {
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      "metrics": [
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    "datePublished": "2023-01-20T22:49:06.378Z",
    "dateReserved": "2023-01-06T14:21:05.892Z",
    "dateUpdated": "2025-03-10T21:21:08.962Z",
    "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.

Action not permitted

OESA-2023-1957 (CVE-2023-22742)

CVE-2023-22742 (GCVE-0-2023-22742)

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