CVE-2023-22742

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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."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-347", "description": "CWE-347: Improper Verification of Cryptographic Signature"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2023-11-07T00:06:32.714Z"}}}, "cveMetadata": {"cveId": "CVE-2023-22742", "state": "PUBLISHED", "dateUpdated": "2025-03-10T21:21:08.962Z", "dateReserved": "2023-01-06T14:21:05.892Z", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "datePublished": "2023-01-20T22:49:06.378Z", "assignerShortName": "GitHub_M"}, "dataVersion": "5.1"}

{"affected": [{"affectedData": [{"product": "libgit2", "vendor": "libgit2", "versions": [{"status": "affected", "version": "< 1.4.5"}, {"status": "affected", "version": "= 1.5.0"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:libgit2:libgit2:*:*:*:*:*:*:*:*", "matchCriteriaId": "211986E1-A66C-4735-8B6B-668FC843933C", "versionEndExcluding": "1.4.5", "vulnerable": true}, {"criteria": "cpe:2.3:a:libgit2:libgit2:1.5.0:*:*:*:*:*:*:*", "matchCriteriaId": "B2042615-3246-4D57-9182-2FAFE3397667", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "libgit2 es una implementaci\u00f3n de librer\u00eda vinculable y multiplataforma de Git. Cuando se utiliza un control remoto SSH con el backend libssh2 opcional, libgit2 no realiza la verificaci\u00f3n de certificados de forma predeterminada. Las versiones anteriores de libgit2 requieren que la persona que llama establezca el campo `certificate_check` de la estructura `git_remote_callbacks` de libgit2; si no se establece una devoluci\u00f3n de llamada de verificaci\u00f3n de certificado, libgit2 no realiza ninguna verificaci\u00f3n de certificado. Esto significa que, de forma predeterminada, sin configurar una devoluci\u00f3n de llamada de verificaci\u00f3n de certificado, los clientes no realizar\u00e1n la validaci\u00f3n de las claves SSH del servidor y pueden estar sujetos a un ataque de intermediario. Se anima a los usuarios a actualizar a v1.4.5 o v1.5.1. Los usuarios que no puedan actualizar deben asegurarse de que todos los certificados relevantes se verifiquen manualmente."}], "id": "CVE-2023-22742", "lastModified": "2026-06-17T05:36:04.797", "metrics": {"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-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2023-22742", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-03-10T20:59:36.699887Z", "version": "2.0.3"}}]}, "published": "2023-01-20T23:15:10.307", "references": [{"source": "security-advisories@github.com", "url": "http://www.openwall.com/lists/oss-security/2023/11/06/5"}, {"source": "security-advisories@github.com", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/libgit2/libgit2/commit/42e5db98b963ae503229c63e44e06e439df50e56"}, {"source": "security-advisories@github.com", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/libgit2/libgit2/commit/cd6f679af401eda1f172402006ef8265f8bd58ea"}, {"source": "security-advisories@github.com", "tags": ["Release Notes", "Third Party Advisory"], "url": "https://github.com/libgit2/libgit2/releases/tag/v1.4.5"}, {"source": "security-advisories@github.com", "tags": ["Release Notes", "Third Party Advisory"], "url": "https://github.com/libgit2/libgit2/releases/tag/v1.5.1"}, {"source": "security-advisories@github.com", "tags": ["Third Party Advisory"], "url": "https://github.com/libgit2/libgit2/security/advisories/GHSA-8643-3wh5-rmjq"}, {"source": "security-advisories@github.com", "tags": ["Third Party Advisory"], "url": "https://www.libssh2.org"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.openwall.com/lists/oss-security/2023/11/06/5"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/libgit2/libgit2/commit/42e5db98b963ae503229c63e44e06e439df50e56"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/libgit2/libgit2/commit/cd6f679af401eda1f172402006ef8265f8bd58ea"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Release Notes", "Third Party Advisory"], "url": "https://github.com/libgit2/libgit2/releases/tag/v1.4.5"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Release Notes", "Third Party Advisory"], "url": "https://github.com/libgit2/libgit2/releases/tag/v1.5.1"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://github.com/libgit2/libgit2/security/advisories/GHSA-8643-3wh5-rmjq"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://www.libssh2.org"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-347"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "libgit2: fails to verify SSH keys by default", "id": "2163614", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2163614"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N", "status": "draft"}, "cwe": "CWE-347", "details": ["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.", "A flaw was found in libgit2, 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."], "mitigation": {"lang": "en:us", "value": "Upgrade the package as soon as possible. Users unable to upgrade should ensure that all relevant certificates are manually checked."}, "name": "CVE-2023-22742", "package_state": [{"cpe": "cpe:/a:redhat:devtools:", "fix_state": "Not affected", "package_name": "rust-toolset-1.62-rust", "product_name": "Red Hat Developer Tools"}, {"cpe": "cpe:/a:redhat:devtools:", "fix_state": "Not affected", "package_name": "rust-toolset-1.66-rust", "product_name": "Red Hat Developer Tools"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "libgit2", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "libgit2", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "rust", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2023-01-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2023-22742\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-22742"], "threat_severity": "Moderate"}

{}