CVE-2023-28321

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This private wildcard matching function would match IDN (International Domain Name) hosts incorrectly and could as a result accept patterns that otherwise should mismatch. IDN hostnames are converted to puny code before used for certificate checks. 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This private wildcard matching function would match IDN (International Domain Name) hosts incorrectly and could as a result accept patterns that otherwise should mismatch. IDN hostnames are converted to puny code before used for certificate checks. Puny coded names always start with `xn--` and should not be allowed to pattern match, but the wildcard check in curl could still check for `x*`, which would match even though the IDN name most likely contained nothing even resembling an `x`."}, {"lang": "es", "value": "Una vulnerabilidad de validaci\u00f3n de certificado incorrecta existe en curl anterior a v8.1.0 en la forma en que soporta la coincidencia de patrones comod\u00edn cuando se lista como 'Subject Alternative Name' en certificados de servidor TLS. curl puede ser compilado para usar su propia funci\u00f3n de coincidencia de nombres para TLS en lugar de una proporcionada por una biblioteca TLS. Esta funci\u00f3n privada de coincidencia de comodines coincidir\u00eda incorrectamente con hosts IDN (International Domain Name) y podr\u00eda como resultado aceptar patrones que de otro modo deber\u00edan no coincidir. Los nombres de host IDN se convierten a puny code antes de ser usados para comprobaciones de certificado. Los nombres en puny code siempre comienzan con 'xn--' y no deber\u00edan permitirse para la coincidencia de patrones, pero la comprobaci\u00f3n de comod\u00edn en curl a\u00fan podr\u00eda buscar 'x*', lo que coincidir\u00eda aunque el nombre IDN muy probablemente no contuviera nada que se pareciera a una 'x'."}], "id": "CVE-2023-28321", "lastModified": "2026-10-23T23:10:00.157", "metrics": {"cvssMetricV31": [{"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"}, {"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.9, 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{"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://support.apple.com/kb/HT213843"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://support.apple.com/kb/HT213844"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://support.apple.com/kb/HT213845"}], "sourceIdentifier": "support@hackerone.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-295"}], "source": "support@hackerone.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-295"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"acknowledgement": "Red Hat would like to thank Daniel Stenberg and Hiroki Kurosawa for reporting this issue.", "affected_release": [{"advisory": "RHSA-2023:4629", "cpe": "cpe:/a:redhat:jboss_core_services:1::el8", "package": "jbcs-httpd24-curl-0:8.2.1-1.el8jbcs", "product_name": "JBoss Core Services for RHEL 8", "release_date": "2023-08-15T00:00:00Z"}, {"advisory": "RHSA-2023:4629", "cpe": "cpe:/a:redhat:jboss_core_services:1::el7", "package": "jbcs-httpd24-curl-0:8.2.1-1.el7jbcs", "product_name": "JBoss Core Services on RHEL 7", "release_date": "2023-08-15T00:00:00Z"}, {"advisory": "RHSA-2023:4523", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "curl-0:7.61.1-30.el8_8.3", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2023-08-08T00:00:00Z"}, {"advisory": "RHSA-2023:6292", "cpe": "cpe:/o:redhat:rhel_eus:8.6", "package": "curl-0:7.61.1-22.el8_6.9", "product_name": "Red Hat Enterprise Linux 8.6 Extended Update Support", "release_date": "2023-11-02T00:00:00Z"}, {"advisory": "RHSA-2023:4354", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "curl-0:7.76.1-23.el9_2.2", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2023-08-01T00:00:00Z"}, {"advisory": "RHSA-2023:4354", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "curl-0:7.76.1-23.el9_2.2", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2023-08-01T00:00:00Z"}, {"advisory": "RHSA-2023:5598", "cpe": "cpe:/a:redhat:rhel_eus:9.0", "package": "curl-0:7.76.1-14.el9_0.7", "product_name": "Red Hat Enterprise Linux 9.0 Extended Update Support", "release_date": "2023-10-10T00:00:00Z"}, {"advisory": "RHSA-2023:4628", "cpe": "cpe:/a:redhat:jboss_core_services:1", "package": "curl", "product_name": "Text-Only JBCS", "release_date": "2023-08-15T00:00:00Z"}], "bugzilla": {"description": "curl: IDN wildcard match may lead to Improper Cerificate Validation", "id": "2196786", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2196786"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.9", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N", "status": "verified"}, "cwe": "CWE-295", "details": ["An improper certificate validation vulnerability exists in curl <v8.1.0 in the way it supports matching of wildcard patterns when listed as \"Subject Alternative Name\" in TLS server certificates. curl can be built to use its own name matching function for TLS rather than one provided by a TLS library. This private wildcard matching function would match IDN (International Domain Name) hosts incorrectly and could as a result accept patterns that otherwise should mismatch. IDN hostnames are converted to puny code before used for certificate checks. Puny coded names always start with `xn--` and should not be allowed to pattern match, but the wildcard check in curl could still check for `x*`, which would match even though the IDN name most likely contained nothing even resembling an `x`.", "A flaw was found in the Curl package. An incorrect International Domain Name (IDN) wildcard match may lead to improper certificate validation."], "name": "CVE-2023-28321", "package_state": [{"cpe": "cpe:/a:redhat:rhel_dotnet:3.1", "fix_state": "Out of support scope", "package_name": "rh-dotnet31-curl", "product_name": ".NET Core 3.1 on Red Hat Enterprise Linux"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "curl", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Will not fix", "package_name": "curl", "product_name": "Red Hat Enterprise Linux 7"}], "public_date": "2023-05-17T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2023-28321\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-28321\nhttps://curl.se/docs/CVE-2023-28321.html"], "threat_severity": "Moderate"}

{}