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authenticated.Using this flaw, it allows a Man-In-The-Middle attacker to first inject the fake responses, then pass-through the TLS traffic from the legitimate server and trick curl into sending data back to the user thinking the attacker's injected data comes from the TLS-protected server."}, {"lang": "es", "value": "Cuando en curl versiones posteriores a 7.20.0 incluy\u00e9ndola, y versiones anteriores a 7.78.0 incluy\u00e9ndola, se conecta a un servidor IMAP o POP3 para recuperar datos usando STARTTLS para actualizar a la seguridad TLS, el servidor puede responder y enviar m\u00faltiples respuestas a la vez que curl almacena en cach\u00e9. curl entonces actualizar\u00eda a TLS pero no vaciar\u00eda la cola de respuestas almacenadas en cach\u00e9, sino que continuar\u00eda usando y confiando en las respuestas que obtuvo *antes* del protocolo de enlace TLS como si estuvieran autenticadas. Usando este fallo, permite a un atacante de tipo Man-In-The-Middle inyectar primero las respuestas falsas, luego pasar mediante el tr\u00e1fico TLS del servidor leg\u00edtimo y enga\u00f1ar a curl para que env\u00ede datos de vuelta al usuario pensando que los datos inyectados por el atacante provienen del servidor protegido por TLS"}], "id": "CVE-2021-22947", "lastModified": "2026-04-16T15:16:44.660", "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": 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, "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": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}, "published": "2021-09-29T20:15:08.253", "references": 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{"affected_release": [{"advisory": "RHSA-2022:1354", "cpe": "cpe:/a:redhat:rhel_dotnet:3.1::el7", "package": "rh-dotnet31-curl-0:7.61.1-22.el7_9", "product_name": ".NET Core on Red Hat Enterprise Linux", "release_date": "2022-04-13T00:00:00Z"}, {"advisory": "RHSA-2021:4059", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "curl-0:7.61.1-18.el8_4.2", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2021-11-02T00:00:00Z"}, {"advisory": "RHSA-2022:0635", "cpe": "cpe:/o:redhat:rhel_eus:8.2", "package": "curl-0:7.61.1-12.el8_2.4", "product_name": "Red Hat Enterprise Linux 8.2 Extended Update Support", "release_date": "2022-02-22T00:00:00Z"}], "bugzilla": {"description": "curl: Server responses received before STARTTLS processed after TLS handshake", "id": "2003191", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2003191"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.1", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:N/A:N", "status": "verified"}, "cwe": "CWE-319", "details": ["When curl >= 7.20.0 and <= 7.78.0 connects to an IMAP or POP3 server to retrieve data using STARTTLS to upgrade to TLS security, the server can respond and send back multiple responses at once that curl caches. curl would then upgrade to TLS but not flush the in-queue of cached responses but instead continue using and trustingthe responses it got *before* the TLS handshake as if they were authenticated.Using this flaw, it allows a Man-In-The-Middle attacker to first inject the fake responses, then pass-through the TLS traffic from the legitimate server and trick curl into sending data back to the user thinking the attacker's injected data comes from the TLS-protected server.", "A flaw was found in curl. The flaw lies in how curl handles cached or pipelined responses that it receives from either a IMAP, POP3, SMTP or FTP server before the TLS upgrade using STARTTLS. In such a scenario curl even after upgrading to TLS would trust these cached responses treating them as valid and authenticated and use them. An attacker could potentially use this flaw to carry out a Man-In-The-Middle attack. The highest threat from this vulnerability is to data confidentiality."], "name": "CVE-2021-22947", "package_state": [{"cpe": "cpe:/a:redhat:rhel_dotnet:2.1", "fix_state": "Out of support scope", "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": "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": "Out of support scope", "package_name": "curl", "product_name": "Red Hat Enterprise Linux 7"}, {"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:jboss_core_services:1", "fix_state": "Not affected", "package_name": "curl", "product_name": "Red Hat JBoss Core Services"}, {"cpe": "cpe:/a:redhat:rhel_software_collections:3", "fix_state": "Affected", "package_name": "httpd24-curl", "product_name": "Red Hat Software Collections"}], "public_date": "2021-09-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-22947\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-22947\nhttps://curl.se/docs/CVE-2021-22947.html"], "threat_severity": "Moderate"}

{}