CVE-2019-3822

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The function creating an outgoing NTLM type-3 header (`lib/vauth/ntlm.c:Curl_auth_create_ntlm_type3_message()`), generates the request HTTP header contents based on previously received data. The check that exists to prevent the local buffer from getting overflowed is implemented wrongly (using unsigned math) and as such it does not prevent the overflow from happening. This output data can grow larger than the local buffer if very large 'nt response' data is extracted from a previous NTLMv2 header provided by the malicious or broken HTTP server. Such a 'large value' needs to be around 1000 bytes or more. The actual payload data copied to the target buffer comes from the NTLMv2 type-2 response header."}, {"lang": "es", "value": "Libcurl, desde la versi\u00f3n 7.36.0 hasta antes de la 7.64.0, es vulnerable a un desbordamiento de b\u00fafer basado en pila. La funci\u00f3n que crea una cabecera saliente NTLM de tipo 3 (\"lib/vauth/ntlm.c:Curl_auth_create_ntlm_type3_message()\") genera el contenido de la cabecera de petici\u00f3n HTTP bas\u00e1ndose en datos recibidos anteriormente. La comprobaci\u00f3n para evitar que el b\u00fafer local se desborde est\u00e1 mal implementada (utilizando matem\u00e1tica no firmada) y, as\u00ed, no evita que el desbordamiento ocurra. Estos datos de salida pueden aumentar m\u00e1s que el b\u00fafer local si se extraen datos \"nt response\" muy grandes de una cabecera NTLMv2 previa, proporcionada por el servidor HTTP malicioso o roto. Este \"valor grande\" necesita ser de, aproximadamente, 1000 bytes o m\u00e1s. Los datos reales de la carga \u00fatil que se copian al b\u00fafer objetivo provienen de la cabecera de respuesta NTLMv2 de tipo 2."}], "id": "CVE-2019-3822", "lastModified": "2026-06-17T02:35:39.603", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "HIGH", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 7.5, "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 6.4, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV30": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "LOW", 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"secalert@redhat.com", "tags": ["Third Party Advisory"], "url": "https://security.gentoo.org/glsa/201903-03"}, {"source": "secalert@redhat.com", "tags": ["Patch", "Third Party Advisory"], "url": "https://security.netapp.com/advisory/ntap-20190315-0001/"}, {"source": "secalert@redhat.com", "tags": ["Third Party Advisory"], "url": "https://security.netapp.com/advisory/ntap-20190719-0004/"}, {"source": "secalert@redhat.com", "tags": ["Third Party Advisory"], "url": "https://support.f5.com/csp/article/K84141449"}, {"source": "secalert@redhat.com", "url": "https://support.f5.com/csp/article/K84141449?utm_source=f5support&amp%3Butm_medium=RSS"}, {"source": "secalert@redhat.com", "tags": ["Third Party Advisory"], "url": "https://usn.ubuntu.com/3882-1/"}, {"source": "secalert@redhat.com", "tags": ["Third Party Advisory"], "url": "https://www.debian.org/security/2019/dsa-4386"}, {"source": "secalert@redhat.com", "tags": ["Patch", "Third Party Advisory"], "url": 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{"acknowledgement": "Red Hat would like to thank Daniel Stenberg (the Curl project) for reporting this issue. Upstream acknowledges Wenxiang Qian (Tencent Blade Team) as the original reporter.", "affected_release": [{"advisory": "RHSA-2019:1543", "cpe": "cpe:/a:redhat:jboss_core_services:1", "product_name": "JBoss Core Services Apache HTTP Server 2.4.29 SP2", "release_date": "2019-06-18T00:00:00Z"}, {"advisory": "RHSA-2019:3701", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "curl-0:7.61.1-11.el8", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2019-11-05T00:00:00Z"}], "bugzilla": {"description": "curl: NTLMv2 type-3 header stack buffer overflow", "id": "1670254", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1670254"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-121", "details": ["libcurl versions from 7.36.0 to before 7.64.0 are vulnerable to a stack-based buffer overflow. The function creating an outgoing NTLM type-3 header (`lib/vauth/ntlm.c:Curl_auth_create_ntlm_type3_message()`), generates the request HTTP header contents based on previously received data. The check that exists to prevent the local buffer from getting overflowed is implemented wrongly (using unsigned math) and as such it does not prevent the overflow from happening. This output data can grow larger than the local buffer if very large 'nt response' data is extracted from a previous NTLMv2 header provided by the malicious or broken HTTP server. Such a 'large value' needs to be around 1000 bytes or more. The actual payload data copied to the target buffer comes from the NTLMv2 type-2 response header.", "A stack-based buffer overflow was found in the way curl handled NTLMv2 type-3 headers. When connecting to a remote malicious server which uses NTLM authentication, the flaw could cause curl to crash."], "mitigation": {"lang": "en:us", "value": "Turn off NTLM authentication."}, "name": "CVE-2019-3822", "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:2.1", "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:rhel_dotnet:2.2", "fix_state": "Out of support scope", "package_name": "rh-dotnet22-curl", "product_name": ".NET Core 2.2 on Red Hat Enterprise Linux"}, {"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Not affected", "package_name": "curl", "product_name": "Red Hat Enterprise Linux 5"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "curl", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "curl", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/a:redhat:jboss_core_services:1", "fix_state": "Affected", "package_name": "curl", "product_name": "Red Hat JBoss Core Services"}, {"cpe": "cpe:/a:redhat:jboss_enterprise_web_server:5", "fix_state": "Not affected", "package_name": "curl", "product_name": "Red Hat JBoss Web Server 5"}, {"cpe": "cpe:/a:redhat:rhel_software_collections:3", "fix_state": "Will not fix", "package_name": "httpd24-curl", "product_name": "Red Hat Software Collections"}], "public_date": "2019-02-06T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2019-3822\nhttps://nvd.nist.gov/vuln/detail/CVE-2019-3822\nhttps://curl.haxx.se/docs/CVE-2019-3822.html"], "statement": "The versions of curl package shipped with Red Hat Enterprise Linux 5, 6, and 7 do not support NTLMv2 type-3 headers, hence they are not affected by this flaw.", "threat_severity": "Moderate"}

{}