CVE-2021-22890

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When using a HTTPS proxy and TLS 1.3, libcurl can confuse session tickets arriving from the HTTPS proxy but work as if they arrived from the remote server and then wrongly \"short-cut\" the host handshake. When confusing the tickets, a HTTPS proxy can trick libcurl to use the wrong session ticket resume for the host and thereby circumvent the server TLS certificate check and make a MITM attack to be possible to perform unnoticed. Note that such a malicious HTTPS proxy needs to provide a certificate that curl will accept for the MITMed server for an attack to work - unless curl has been told to ignore the server certificate check."}, {"lang": "es", "value": "curl versiones 7.63.0 hasta 7.75.0 incluy\u00e9ndola, incluye una vulnerabilidad que permite que un proxy HTTPS malicioso acceda a una conexi\u00f3n MITM debido al manejo inapropiado de los tickets de sesi\u00f3n de TLS versi\u00f3n 1.3. Cuando se usa un proxy HTTPS y TLS 1.3, libcurl puede confundir los tickets de sesi\u00f3n que llegan del proxy HTTPS pero funciona como si llegaran del servidor remoto y luego \"short-cut\" incorrectamente el protocolo de enlace del host. Al confundir los tickets, un proxy HTTPS puede enga\u00f1ar a libcurl para que utilice la reanudaci\u00f3n del ticket de sesi\u00f3n incorrecta para el host y, por lo tanto, omitir la verificaci\u00f3n del certificado TLS del servidor y hacer que un ataque MITM sea posible de realizar sin ser detectado. Tome en cuenta que dicho proxy HTTPS malicioso debe proporcionar un certificado que curl aceptar\u00e1 para el servidor MITMed para que funcione un ataque, a menos que se le haya dicho a curl que ignore la verificaci\u00f3n del certificado del servidor."}], "id": "CVE-2021-22890", "lastModified": "2026-10-14T11:16:52.373", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "NONE", "baseScore": 4.3, "confidentialityImpact": "NONE", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "version": "2.0"}, "exploitabilityScore": 8.6, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 3.7, "baseSeverity": "LOW", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 1.4, "source": "nvd@nist.gov", "type": "Primary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 1.4, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-22890", "options": 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{"acknowledgement": "Red Hat would like to thank the Curl project for reporting this issue. Upstream acknowledges Mingtao Yang (Facebook) as the original reporter.", "affected_release": [{"advisory": "RHSA-2021:2471", "cpe": "cpe:/a:redhat:jboss_core_services:1", "package": "curl", "product_name": "JBoss Core Services Apache HTTP Server 2.4.37 SP8", "release_date": "2021-06-17T00:00:00Z"}, {"advisory": "RHSA-2021:2472", "cpe": "cpe:/a:redhat:jboss_core_services:1::el8", "package": "jbcs-httpd24-0:1-18.el8jbcs", "product_name": "JBoss Core Services for RHEL 8", "release_date": "2021-06-17T00:00:00Z"}, {"advisory": "RHSA-2021:2472", "cpe": "cpe:/a:redhat:jboss_core_services:1::el8", "package": "jbcs-httpd24-apr-0:1.6.3-105.el8jbcs", "product_name": "JBoss Core Services for RHEL 8", "release_date": "2021-06-17T00:00:00Z"}, {"advisory": "RHSA-2021:2472", "cpe": "cpe:/a:redhat:jboss_core_services:1::el8", "package": "jbcs-httpd24-apr-util-0:1.6.1-82.el8jbcs", "product_name": "JBoss Core Services for RHEL 8", "release_date": "2021-06-17T00:00:00Z"}, {"advisory": "RHSA-2021:2472", 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"2021-06-17T00:00:00Z"}, {"advisory": "RHSA-2021:2472", "cpe": "cpe:/a:redhat:jboss_core_services:1::el7", "package": "jbcs-httpd24-0:1-18.jbcs.el7", "product_name": "JBoss Core Services on RHEL 7", "release_date": "2021-06-17T00:00:00Z"}, {"advisory": "RHSA-2021:2472", "cpe": "cpe:/a:redhat:jboss_core_services:1::el7", "package": "jbcs-httpd24-apr-0:1.6.3-105.jbcs.el7", "product_name": "JBoss Core Services on RHEL 7", "release_date": "2021-06-17T00:00:00Z"}, {"advisory": "RHSA-2021:2472", "cpe": "cpe:/a:redhat:jboss_core_services:1::el7", "package": "jbcs-httpd24-apr-util-0:1.6.1-82.jbcs.el7", "product_name": "JBoss Core Services on RHEL 7", "release_date": "2021-06-17T00:00:00Z"}, {"advisory": "RHSA-2021:2472", "cpe": "cpe:/a:redhat:jboss_core_services:1::el7", "package": "jbcs-httpd24-curl-0:7.77.0-2.jbcs.el7", "product_name": "JBoss Core Services on RHEL 7", "release_date": "2021-06-17T00:00:00Z"}, {"advisory": "RHSA-2021:2472", "cpe": "cpe:/a:redhat:jboss_core_services:1::el7", "package": "jbcs-httpd24-httpd-0:2.4.37-74.jbcs.el7", "product_name": "JBoss Core Services on RHEL 7", "release_date": "2021-06-17T00:00:00Z"}, {"advisory": "RHSA-2021:2472", "cpe": "cpe:/a:redhat:jboss_core_services:1::el7", "package": "jbcs-httpd24-jansson-0:2.11-55.jbcs.el7", "product_name": "JBoss Core Services on RHEL 7", "release_date": "2021-06-17T00:00:00Z"}, {"advisory": "RHSA-2021:2472", "cpe": "cpe:/a:redhat:jboss_core_services:1::el7", "package": "jbcs-httpd24-mod_cluster-native-0:1.3.16-5.Final_redhat_2.jbcs.el7", "product_name": "JBoss Core Services on RHEL 7", "release_date": "2021-06-17T00:00:00Z"}, {"advisory": "RHSA-2021:2472", "cpe": "cpe:/a:redhat:jboss_core_services:1::el7", "package": "jbcs-httpd24-mod_http2-0:1.15.7-17.jbcs.el7", "product_name": "JBoss Core Services on RHEL 7", "release_date": "2021-06-17T00:00:00Z"}, {"advisory": "RHSA-2021:2472", "cpe": "cpe:/a:redhat:jboss_core_services:1::el7", "package": "jbcs-httpd24-mod_jk-0:1.2.48-16.redhat_1.jbcs.el7", "product_name": "JBoss Core Services on RHEL 7", "release_date": "2021-06-17T00:00:00Z"}, {"advisory": "RHSA-2021:2472", "cpe": "cpe:/a:redhat:jboss_core_services:1::el7", "package": "jbcs-httpd24-mod_md-1:2.0.8-36.jbcs.el7", "product_name": "JBoss Core Services on RHEL 7", "release_date": "2021-06-17T00:00:00Z"}, {"advisory": "RHSA-2021:2472", "cpe": "cpe:/a:redhat:jboss_core_services:1::el7", "package": "jbcs-httpd24-mod_security-0:2.9.2-63.GA.jbcs.el7", "product_name": "JBoss Core Services on RHEL 7", "release_date": "2021-06-17T00:00:00Z"}], "bugzilla": {"description": "curl: TLS 1.3 session ticket mix-up with HTTPS proxy host", "id": "1941965", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1941965"}, "csaw": false, "cvss3": {"cvss3_base_score": "3.7", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N", "status": "verified"}, "cwe": "CWE-290", "details": ["curl 7.63.0 to and including 7.75.0 includes vulnerability that allows a malicious HTTPS proxy to MITM a connection due to bad handling of TLS 1.3 session tickets. When using a HTTPS proxy and TLS 1.3, libcurl can confuse session tickets arriving from the HTTPS proxy but work as if they arrived from the remote server and then wrongly \"short-cut\" the host handshake. When confusing the tickets, a HTTPS proxy can trick libcurl to use the wrong session ticket resume for the host and thereby circumvent the server TLS certificate check and make a MITM attack to be possible to perform unnoticed. Note that such a malicious HTTPS proxy needs to provide a certificate that curl will accept for the MITMed server for an attack to work - unless curl has been told to ignore the server certificate check.", "A flaw was found in the way libcurl handled TLS 1.3 session tickets. A malicious HTTPS proxy could possibly use this flaw to make libcurl resume a TLS session it previously had with the proxy while intending to resume a TLS session with a target server, making it possible for the proxy to perform a man-in-the-middle attack."], "name": "CVE-2021-22890", "package_state": [{"cpe": "cpe:/a:redhat:rhel_dotnet:2.1", "fix_state": "Not affected", "package_name": "rh-dotnet21-curl", "product_name": ".NET Core 2.1 on Red Hat Enterprise Linux"}, {"cpe": "cpe:/a:redhat:rhel_dotnet:3.1", "fix_state": "Not affected", "package_name": "rh-dotnet31-curl", "product_name": ".NET Core 3.1 on Red Hat Enterprise Linux"}, {"cpe": "cpe:/a:redhat:ceph_storage:2", "fix_state": "Out of support scope", "package_name": "curl", "product_name": "Red Hat Ceph Storage 2"}, {"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:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "curl", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "curl", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:rhel_software_collections:3", "fix_state": "Not affected", "package_name": "httpd24-curl", "product_name": "Red Hat Software Collections"}], "public_date": "2021-03-31T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-22890\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-22890\nhttps://curl.se/docs/CVE-2021-22890.html"], "threat_severity": "Low"}

{}