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This too large value is then used in the sendto() call, making curl attempt to send more data than what is actually put into the buffer. The endto() function will then read beyond the end of the heap based buffer. A malicious HTTP(S) server could redirect a vulnerable libcurl-using client to a crafted TFTP URL (if the client hasn't restricted which protocols it allows redirects to) and trick it to send private memory contents to a remote server over UDP. Limit curl's redirect protocols with --proto-redir and libcurl's with CURLOPT_REDIR_PROTOCOLS."}, {"lang": "es", "value": "A la hora de hacer una transferencia TFTP y proporcionar una URL con un nombre de archivo muy grande (mayor que 515 bytes) en curl/libcurl, el nombre de archivo se trunca para que entre en los l\u00edmites del b\u00fafer, pero el tama\u00f1o del b\u00fafer se sigue actualizando err\u00f3neamente para usar la longitud no truncada. Este valor excesivamente grande se utiliza luego en la llamada sendto(), lo que hace que un intento curl env\u00ede m\u00e1s datos que los que est\u00e1n realmente puestos en el b\u00fafer. La funci\u00f3n endto() lee entonces m\u00e1s all\u00e1 del final del b\u00fafer basado en la memoria din\u00e1mica (heap). Un servidor HTTP(S) malicioso podr\u00eda redirigir un cliente vulnerable que utiliza libcurl a una URL TFTP manipulada (si el cliente no tuviese restringidos a qu\u00e9 protocolos se permiten redirecciones) y enga\u00f1arle para que env\u00ede contenidos privados de la memoria a un servidor remoto por UDP. Limite los protocolos de redirecci\u00f3n de curl con --proto-redir y los de libcurl, con CURLOPT_REDIR_PROTOCOLS."}], "id": "CVE-2017-1000100", "lastModified": "2026-04-16T14:16:10.253", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "NONE", "baseScore": 4.3, "confidentialityImpact": "PARTIAL", "integrityImpact": "NONE", "vectorString": "AV:N/AC:M/Au:N/C:P/I:N/A:N", "version": "2.0"}, "exploitabilityScore": 8.6, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": true}], "cvssMetricV30": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N", "version": "3.0"}, "exploitabilityScore": 2.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 3.6, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}, "published": "2017-10-05T01:29:04.057", "references": [{"source": "cve@mitre.org", "url": "http://www.debian.org/security/2017/dsa-3992"}, {"source": "cve@mitre.org", "tags": ["Third Party Advisory", "VDB Entry"], "url": "http://www.securityfocus.com/bid/100286"}, {"source": "cve@mitre.org", "tags": ["Third Party Advisory", "VDB Entry"], "url": "http://www.securitytracker.com/id/1039118"}, {"source": "cve@mitre.org", "url": "https://access.redhat.com/errata/RHSA-2018:3558"}, {"source": "cve@mitre.org", "tags": ["Patch", "Vendor Advisory"], "url": "https://curl.haxx.se/docs/adv_20170809B.html"}, {"source": "cve@mitre.org", "tags": ["Patch", "Third Party Advisory", "VDB Entry"], "url": "https://security.gentoo.org/glsa/201709-14"}, {"source": "cve@mitre.org", "url": "https://support.apple.com/HT208221"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.debian.org/security/2017/dsa-3992"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory", "VDB Entry"], "url": "http://www.securityfocus.com/bid/100286"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory", "VDB Entry"], "url": "http://www.securitytracker.com/id/1039118"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://access.redhat.com/errata/RHSA-2018:3558"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Vendor Advisory"], "url": "https://curl.haxx.se/docs/adv_20170809B.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory", "VDB Entry"], "url": "https://security.gentoo.org/glsa/201709-14"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://support.apple.com/HT208221"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-200"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-200"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"acknowledgement": "Red Hat would like to thank the Curl project for reporting this issue. Upstream acknowledges Even Rouault as the original reporter.", "affected_release": [{"advisory": "RHSA-2018:3558", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el6", "package": "httpd24-curl-0:7.61.1-1.el6", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 6", "release_date": "2018-11-13T00:00:00Z"}, {"advisory": "RHSA-2018:3558", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el6", "package": "httpd24-httpd-0:2.4.34-7.el6", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 6", "release_date": "2018-11-13T00:00:00Z"}, {"advisory": "RHSA-2018:3558", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el6", "package": "httpd24-nghttp2-0:1.7.1-7.el6", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 6", "release_date": "2018-11-13T00:00:00Z"}, {"advisory": "RHSA-2018:3558", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el7", "package": "httpd24-curl-0:7.61.1-1.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7", "release_date": "2018-11-13T00:00:00Z"}, {"advisory": "RHSA-2018:3558", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el7", "package": "httpd24-httpd-0:2.4.34-7.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7", "release_date": "2018-11-13T00:00:00Z"}, {"advisory": "RHSA-2018:3558", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el7", "package": "httpd24-nghttp2-0:1.7.1-7.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7", "release_date": "2018-11-13T00:00:00Z"}, {"advisory": "RHSA-2018:3558", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el7", "package": "httpd24-curl-0:7.61.1-1.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS", "release_date": "2018-11-13T00:00:00Z"}, {"advisory": "RHSA-2018:3558", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el7", "package": "httpd24-httpd-0:2.4.34-7.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS", "release_date": "2018-11-13T00:00:00Z"}, {"advisory": "RHSA-2018:3558", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el7", "package": "httpd24-nghttp2-0:1.7.1-7.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS", "release_date": "2018-11-13T00:00:00Z"}, {"advisory": "RHSA-2018:3558", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el7", "package": "httpd24-curl-0:7.61.1-1.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS", "release_date": "2018-11-13T00:00:00Z"}, {"advisory": "RHSA-2018:3558", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el7", "package": "httpd24-httpd-0:2.4.34-7.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS", "release_date": "2018-11-13T00:00:00Z"}, {"advisory": "RHSA-2018:3558", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el7", "package": "httpd24-nghttp2-0:1.7.1-7.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS", "release_date": "2018-11-13T00:00:00Z"}, {"advisory": "RHSA-2018:3558", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el7", "package": "httpd24-curl-0:7.61.1-1.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS", "release_date": "2018-11-13T00:00:00Z"}, {"advisory": "RHSA-2018:3558", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el7", "package": "httpd24-httpd-0:2.4.34-7.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS", "release_date": "2018-11-13T00:00:00Z"}, {"advisory": "RHSA-2018:3558", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el7", "package": "httpd24-nghttp2-0:1.7.1-7.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS", "release_date": "2018-11-13T00:00:00Z"}], "bugzilla": {"description": "curl: TFTP sends more than buffer size", "id": "1478310", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1478310"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.8", "cvss3_scoring_vector": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L", "status": "verified"}, "cwe": "CWE-125", "details": ["When doing a TFTP transfer and curl/libcurl is given a URL that contains a very long file name (longer than about 515 bytes), the file name is truncated to fit within the buffer boundaries, but the buffer size is still wrongly updated to use the untruncated length. This too large value is then used in the sendto() call, making curl attempt to send more data than what is actually put into the buffer. The endto() function will then read beyond the end of the heap based buffer. A malicious HTTP(S) server could redirect a vulnerable libcurl-using client to a crafted TFTP URL (if the client hasn't restricted which protocols it allows redirects to) and trick it to send private memory contents to a remote server over UDP. Limit curl's redirect protocols with --proto-redir and libcurl's with CURLOPT_REDIR_PROTOCOLS."], "name": "CVE-2017-1000100", "package_state": [{"cpe": "cpe:/a:redhat:rhel_dotnet:1.0", "fix_state": "Out of support scope", "package_name": "rh-dotnetcore10-curl", "product_name": ".NET Core 1.0 on Red Hat Enterprise Linux"}, {"cpe": "cpe:/a:redhat:rhel_dotnet:1.1", "fix_state": "Out of support scope", "package_name": "rh-dotnetcore11-curl", "product_name": ".NET Core 1.1 on Red Hat Enterprise Linux"}, {"cpe": "cpe:/a:redhat:rhel_dotnet:2.0", "fix_state": "Out of support scope", "package_name": "rh-dotnet20-curl", "product_name": ".NET Core 2.0 on Red Hat Enterprise Linux"}, {"cpe": "cpe:/a:redhat:rhel_dotnet:2.1", "fix_state": "Will not fix", "package_name": "rh-dotnet21-curl", "product_name": ".NET Core 2.1 on Red Hat Enterprise Linux"}, {"cpe": "cpe:/a:redhat:ceph_storage:2", "fix_state": "Will not fix", "package_name": "curl", "product_name": "Red Hat Ceph Storage 2"}, {"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Will not fix", "package_name": "curl", "product_name": "Red Hat Enterprise Linux 5"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Will not fix", "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"}, {"cpe": "cpe:/a:redhat:enterprise_linux:7::hypervisor", "fix_state": "Will not fix", "package_name": "mingw-virt-viewer", "product_name": "Red Hat Enterprise Virtualization 3"}, {"cpe": "cpe:/a:redhat:jboss_enterprise_web_server:3", "fix_state": "Will not fix", "package_name": "curl", "product_name": "Red Hat JBoss Enterprise Web Server 3"}], "public_date": "2017-08-09T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2017-1000100\nhttps://nvd.nist.gov/vuln/detail/CVE-2017-1000100\nhttps://curl.haxx.se/docs/adv_20170809B.html"], "statement": "Red Hat Product Security has rated this issue as having Low security impact. This issue is not currently planned to be addressed in future updates. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/.", "threat_severity": "Low"}