{"dataType": "CVE_RECORD", "cveMetadata": {"state": "PUBLISHED", "cveId": "CVE-2021-3711", "assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "assignerShortName": "openssl", "dateUpdated": "2024-09-16T18:29:03.742Z", "dateReserved": "2021-08-16T00:00:00", "datePublished": "2021-08-24T14:50:13.114745Z"}, "containers": {"cna": {"title": "SM2 Decryption Buffer Overflow", "datePublic": "2021-08-24T00:00:00", "providerMetadata": {"orgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "shortName": "openssl", "dateUpdated": "2024-06-21T19:07:59.573968"}, "descriptions": [{"lang": "en", "value": "In order to decrypt SM2 encrypted data an application is expected to call the API function EVP_PKEY_decrypt(). Typically an application will call this function twice. The first time, on entry, the \"out\" parameter can be NULL and, on exit, the \"outlen\" parameter is populated with the buffer size required to hold the decrypted plaintext. The application can then allocate a sufficiently sized buffer and call EVP_PKEY_decrypt() again, but this time passing a non-NULL value for the \"out\" parameter. A bug in the implementation of the SM2 decryption code means that the calculation of the buffer size required to hold the plaintext returned by the first call to EVP_PKEY_decrypt() can be smaller than the actual size required by the second call. This can lead to a buffer overflow when EVP_PKEY_decrypt() is called by the application a second time with a buffer that is too small. A malicious attacker who is able present SM2 content for decryption to an application could cause attacker chosen data to overflow the buffer by up to a maximum of 62 bytes altering the contents of other data held after the buffer, possibly changing application behaviour or causing the application to crash. The location of the buffer is application dependent but is typically heap allocated. Fixed in OpenSSL 1.1.1l (Affected 1.1.1-1.1.1k)."}], "affected": [{"vendor": "OpenSSL", "product": "OpenSSL", "versions": [{"version": "Fixed in OpenSSL 1.1.1l (Affected 1.1.1-1.1.1k)", "status": "affected"}]}], "references": [{"url": "https://www.openssl.org/news/secadv/20210824.txt"}, {"url": "https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=59f5e75f3bced8fc0e130d72a3f582cf7b480b46"}, {"name": "DSA-4963", "tags": ["vendor-advisory"], "url": "https://www.debian.org/security/2021/dsa-4963"}, {"name": "[tomcat-dev] 20210825 OpenSSL security announcement - do we need a Tomcat Native release?", "tags": ["mailing-list"], "url": "https://lists.apache.org/thread.html/r18995de860f0e63635f3008fd2a6aca82394249476d21691e7c59c9e%40%3Cdev.tomcat.apache.org%3E"}, {"name": "[oss-security] 20210825 OpenSSL SM2 Decryption Buffer Overflow (CVE-2021-3711), Read buffer overruns processing ASN.1 strings (CVE-2021-3712)", "tags": ["mailing-list"], "url": "http://www.openwall.com/lists/oss-security/2021/08/26/2"}, {"name": "[tomcat-dev] 20210826 Re: OpenSSL security announcement - do we need a Tomcat Native release?", "tags": ["mailing-list"], "url": "https://lists.apache.org/thread.html/rad5d9f83f0d11fb3f8bb148d179b8a9ad7c6a17f18d70e5805a713d1%40%3Cdev.tomcat.apache.org%3E"}, {"url": "https://security.netapp.com/advisory/ntap-20210827-0010/"}, {"url": "https://www.oracle.com/security-alerts/cpuoct2021.html"}, {"url": "https://www.tenable.com/security/tns-2021-16"}, {"url": "https://www.oracle.com/security-alerts/cpujan2022.html"}, {"url": "https://security.netapp.com/advisory/ntap-20211022-0003/"}, {"url": "https://www.tenable.com/security/tns-2022-02"}, {"url": "https://www.oracle.com/security-alerts/cpuapr2022.html"}, {"url": "https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf"}, {"name": "GLSA-202209-02", "tags": ["vendor-advisory"], "url": "https://security.gentoo.org/glsa/202209-02"}, {"name": "GLSA-202210-02", "tags": ["vendor-advisory"], "url": "https://security.gentoo.org/glsa/202210-02"}, {"url": "https://security.netapp.com/advisory/ntap-20240621-0006/"}], "credits": [{"lang": "en", "value": "John Ouyang"}], "metrics": [{"other": {"type": "unknown", "content": {"lang": "eng", "url": "https://www.openssl.org/policies/secpolicy.html#High", "value": "High"}}}], "problemTypes": [{"descriptions": [{"type": "text", "lang": "en", "description": "Buffer overflow"}]}]}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T17:01:08.171Z"}, "title": "CVE Program Container", "references": [{"url": "https://www.openssl.org/news/secadv/20210824.txt", "tags": ["x_transferred"]}, {"url": "https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=59f5e75f3bced8fc0e130d72a3f582cf7b480b46", "tags": ["x_transferred"]}, {"name": "DSA-4963", "tags": ["vendor-advisory", "x_transferred"], "url": "https://www.debian.org/security/2021/dsa-4963"}, {"name": "[tomcat-dev] 20210825 OpenSSL security announcement - do we need a Tomcat Native release?", "tags": ["mailing-list", "x_transferred"], "url": "https://lists.apache.org/thread.html/r18995de860f0e63635f3008fd2a6aca82394249476d21691e7c59c9e%40%3Cdev.tomcat.apache.org%3E"}, {"name": "[oss-security] 20210825 OpenSSL SM2 Decryption Buffer Overflow (CVE-2021-3711), Read buffer overruns processing ASN.1 strings (CVE-2021-3712)", "tags": ["mailing-list", "x_transferred"], "url": "http://www.openwall.com/lists/oss-security/2021/08/26/2"}, {"name": "[tomcat-dev] 20210826 Re: OpenSSL security announcement - do we need a Tomcat Native release?", "tags": ["mailing-list", "x_transferred"], "url": "https://lists.apache.org/thread.html/rad5d9f83f0d11fb3f8bb148d179b8a9ad7c6a17f18d70e5805a713d1%40%3Cdev.tomcat.apache.org%3E"}, {"url": "https://security.netapp.com/advisory/ntap-20210827-0010/", "tags": ["x_transferred"]}, {"url": "https://www.oracle.com/security-alerts/cpuoct2021.html", "tags": ["x_transferred"]}, {"url": "https://www.tenable.com/security/tns-2021-16", "tags": ["x_transferred"]}, {"url": "https://www.oracle.com/security-alerts/cpujan2022.html", "tags": ["x_transferred"]}, {"url": "https://security.netapp.com/advisory/ntap-20211022-0003/", "tags": ["x_transferred"]}, {"url": "https://www.tenable.com/security/tns-2022-02", "tags": ["x_transferred"]}, {"url": "https://www.oracle.com/security-alerts/cpuapr2022.html", "tags": ["x_transferred"]}, {"url": "https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf", "tags": ["x_transferred"]}, {"name": "GLSA-202209-02", "tags": ["vendor-advisory", "x_transferred"], "url": "https://security.gentoo.org/glsa/202209-02"}, {"name": "GLSA-202210-02", "tags": ["vendor-advisory", "x_transferred"], "url": "https://security.gentoo.org/glsa/202210-02"}, {"url": "https://security.netapp.com/advisory/ntap-20240621-0006/", "tags": ["x_transferred"]}]}]}, "dataVersion": "5.1"}

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Typically an application will call this function twice. The first time, on entry, the \"out\" parameter can be NULL and, on exit, the \"outlen\" parameter is populated with the buffer size required to hold the decrypted plaintext. The application can then allocate a sufficiently sized buffer and call EVP_PKEY_decrypt() again, but this time passing a non-NULL value for the \"out\" parameter. A bug in the implementation of the SM2 decryption code means that the calculation of the buffer size required to hold the plaintext returned by the first call to EVP_PKEY_decrypt() can be smaller than the actual size required by the second call. This can lead to a buffer overflow when EVP_PKEY_decrypt() is called by the application a second time with a buffer that is too small. A malicious attacker who is able present SM2 content for decryption to an application could cause attacker chosen data to overflow the buffer by up to a maximum of 62 bytes altering the contents of other data held after the buffer, possibly changing application behaviour or causing the application to crash. The location of the buffer is application dependent but is typically heap allocated. Fixed in OpenSSL 1.1.1l (Affected 1.1.1-1.1.1k)."}, {"lang": "es", "value": "Para descifrar los datos cifrados de SM2 se espera que una aplicaci\u00f3n llame a la funci\u00f3n de la API EVP_PKEY_decrypt(). Normalmente, una aplicaci\u00f3n llamar\u00e1 a esta funci\u00f3n dos veces. La primera vez, al entrar, el par\u00e1metro \"out\" puede ser NULL y, al salir, el par\u00e1metro \"outlen\" se rellena con el tama\u00f1o del b\u00fafer necesario para contener el texto plano descifrado. La aplicaci\u00f3n puede entonces asignar un b\u00fafer de tama\u00f1o suficiente y llamar de nuevo a EVP_PKEY_decrypt(), pero esta vez pasando un valor no NULL para el par\u00e1metro \"out\". Un bug en la implementaci\u00f3n del c\u00f3digo de descifrado SM2 significa que el c\u00e1lculo del tama\u00f1o del b\u00fafer necesario para mantener el texto plano devuelto por la primera llamada a EVP_PKEY_decrypt() puede ser menor que el tama\u00f1o real requerido por la segunda llamada. Esto puede conllevar a un desbordamiento del b\u00fafer cuando la aplicaci\u00f3n llama a EVP_PKEY_decrypt() por segunda vez con un b\u00fafer demasiado peque\u00f1o. Un atacante malicioso que sea capaz de presentar el contenido de SM2 para su descifrado a una aplicaci\u00f3n podr\u00eda causar que los datos elegidos por el atacante desborden el b\u00fafer hasta un m\u00e1ximo de 62 bytes alterando el contenido de otros datos mantenidos despu\u00e9s del b\u00fafer, posiblemente cambiando el comportamiento de la aplicaci\u00f3n o causando el bloqueo de la misma. La ubicaci\u00f3n del b\u00fafer depende de la aplicaci\u00f3n, pero normalmente se asigna a la pila. Corregido en OpenSSL versi\u00f3n 1.1.1l (Afectada 1.1.1-1.1.1k)."}], "id": "CVE-2021-3711", "lastModified": "2024-11-21T06:22:12.960", "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": "[email protected]", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "[email protected]", "type": "Primary"}]}, "published": "2021-08-24T15:15:09.133", "references": [{"source": "[email protected]", "tags": ["Mailing List", "Third Party Advisory"], "url": "http://www.openwall.com/lists/oss-security/2021/08/26/2"}, {"source": "[email protected]", "tags": ["Third Party Advisory"], "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf"}, {"source": "[email protected]", "url": "https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=59f5e75f3bced8fc0e130d72a3f582cf7b480b46"}, {"source": "[email protected]", "url": "https://lists.apache.org/thread.html/r18995de860f0e63635f3008fd2a6aca82394249476d21691e7c59c9e%40%3Cdev.tomcat.apache.org%3E"}, {"source": "[email protected]", "url": 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{"acknowledgement": "Upstream acknowledges the OpenSSL project (John Ouyang) as the original reporter.", "affected_release": [{"advisory": "RHSA-2021:4618", "cpe": "cpe:/a:redhat:acm:2.4::el8", "package": "acm-grafana-container", "product_name": "Red Hat Advanced Cluster Management for Kubernetes 2", "release_date": "2021-11-11T00:00:00Z"}, {"advisory": "RHSA-2021:4618", "cpe": "cpe:/a:redhat:acm:2.4::el8", "package": "acm-must-gather-container", "product_name": "Red Hat Advanced Cluster Management for Kubernetes 2", "release_date": "2021-11-11T00:00:00Z"}, {"advisory": "RHSA-2021:4618", "cpe": "cpe:/a:redhat:acm:2.4::el8", "package": "acm-operator-bundle-container", "product_name": "Red Hat Advanced Cluster Management for Kubernetes 2", "release_date": "2021-11-11T00:00:00Z"}, {"advisory": "RHSA-2021:4618", "cpe": "cpe:/a:redhat:acm:2.4::el8", "package": "application-ui-container", "product_name": "Red Hat Advanced Cluster Management for Kubernetes 2", "release_date": 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"product_name": "Red Hat Advanced Cluster Management for Kubernetes 2", "release_date": "2021-11-11T00:00:00Z"}, {"advisory": "RHSA-2021:4618", "cpe": "cpe:/a:redhat:acm:2.4::el8", "package": "rhacm-assisted-installer-container", "product_name": "Red Hat Advanced Cluster Management for Kubernetes 2", "release_date": "2021-11-11T00:00:00Z"}, {"advisory": "RHSA-2021:4618", "cpe": "cpe:/a:redhat:acm:2.4::el8", "package": "rhacm-assisted-installer-reporter-container", "product_name": "Red Hat Advanced Cluster Management for Kubernetes 2", "release_date": "2021-11-11T00:00:00Z"}, {"advisory": "RHSA-2021:4618", "cpe": "cpe:/a:redhat:acm:2.4::el8", "package": "search-aggregator-container", "product_name": "Red Hat Advanced Cluster Management for Kubernetes 2", "release_date": "2021-11-11T00:00:00Z"}, {"advisory": "RHSA-2021:4618", "cpe": "cpe:/a:redhat:acm:2.4::el8", "package": "search-api-container", "product_name": "Red Hat Advanced Cluster Management for Kubernetes 2", "release_date": "2021-11-11T00:00:00Z"}, {"advisory": "RHSA-2021:4618", "cpe": "cpe:/a:redhat:acm:2.4::el8", "package": "search-collector-container", "product_name": "Red Hat Advanced Cluster Management for Kubernetes 2", "release_date": "2021-11-11T00:00:00Z"}, {"advisory": "RHSA-2021:4618", "cpe": "cpe:/a:redhat:acm:2.4::el8", "package": "search-operator-container", "product_name": "Red Hat Advanced Cluster Management for Kubernetes 2", "release_date": "2021-11-11T00:00:00Z"}, {"advisory": "RHSA-2021:4618", "cpe": "cpe:/a:redhat:acm:2.4::el8", "package": "search-ui-container", "product_name": "Red Hat Advanced Cluster Management for Kubernetes 2", "release_date": "2021-11-11T00:00:00Z"}, {"advisory": "RHSA-2021:4618", "cpe": "cpe:/a:redhat:acm:2.4::el8", "package": "submariner-addon-container", "product_name": "Red Hat Advanced Cluster Management for Kubernetes 2", "release_date": "2021-11-11T00:00:00Z"}, {"advisory": "RHSA-2021:4618", "cpe": "cpe:/a:redhat:acm:2.4::el8", "package": "thanos-container", "product_name": "Red Hat Advanced Cluster Management for Kubernetes 2", "release_date": "2021-11-11T00:00:00Z"}, {"advisory": "RHSA-2021:4618", "cpe": "cpe:/a:redhat:acm:2.4::el8", "package": "thanos-receive-controller-container", "product_name": "Red Hat Advanced Cluster Management for Kubernetes 2", "release_date": "2021-11-11T00:00:00Z"}, {"advisory": "RHSA-2021:4618", "cpe": "cpe:/a:redhat:acm:2.4::el8", "package": "volsync-container", "product_name": "Red Hat Advanced Cluster Management for Kubernetes 2", "release_date": "2021-11-11T00:00:00Z"}, {"advisory": "RHSA-2021:4618", "cpe": "cpe:/a:redhat:acm:2.4::el8", "package": "volsync-mover-rclone-container", "product_name": "Red Hat Advanced Cluster Management for Kubernetes 2", "release_date": "2021-11-11T00:00:00Z"}, {"advisory": "RHSA-2021:4618", "cpe": "cpe:/a:redhat:acm:2.4::el8", "package": "volsync-mover-restic-container", "product_name": "Red Hat Advanced Cluster Management for Kubernetes 2", "release_date": "2021-11-11T00:00:00Z"}, {"advisory": "RHSA-2021:4618", "cpe": "cpe:/a:redhat:acm:2.4::el8", "package": "volsync-mover-rsync-container", "product_name": "Red Hat Advanced Cluster Management for Kubernetes 2", "release_date": "2021-11-11T00:00:00Z"}, {"advisory": "RHSA-2021:4618", "cpe": "cpe:/a:redhat:acm:2.4::el8", "package": "work-container", "product_name": "Red Hat Advanced Cluster Management for Kubernetes 2", "release_date": "2021-11-11T00:00:00Z"}], "bugzilla": {"description": "openssl: SM2 Decryption Buffer Overflow", "id": "1995623", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1995623"}, "csaw": false, "cvss3": {"cvss3_base_score": "9.8", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "status": "verified"}, "cwe": "CWE-131->CWE-787", "details": ["In order to decrypt SM2 encrypted data an application is expected to call the API function EVP_PKEY_decrypt(). Typically an application will call this function twice. The first time, on entry, the \"out\" parameter can be NULL and, on exit, the \"outlen\" parameter is populated with the buffer size required to hold the decrypted plaintext. The application can then allocate a sufficiently sized buffer and call EVP_PKEY_decrypt() again, but this time passing a non-NULL value for the \"out\" parameter. A bug in the implementation of the SM2 decryption code means that the calculation of the buffer size required to hold the plaintext returned by the first call to EVP_PKEY_decrypt() can be smaller than the actual size required by the second call. This can lead to a buffer overflow when EVP_PKEY_decrypt() is called by the application a second time with a buffer that is too small. A malicious attacker who is able present SM2 content for decryption to an application could cause attacker chosen data to overflow the buffer by up to a maximum of 62 bytes altering the contents of other data held after the buffer, possibly changing application behaviour or causing the application to crash. The location of the buffer is application dependent but is typically heap allocated. Fixed in OpenSSL 1.1.1l (Affected 1.1.1-1.1.1k).", "A flaw was found in openssl. A miscalculation of a buffer size was found in openssl's SM2 decryption function, allowing up to 62 arbitrary bytes to be written outside of the buffer. A remote attacker could use this flaw to crash an application supporting SM2 signature or encryption algorithm, or, possibly, execute arbitrary code with the permissions of the user running that application. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability."], "name": "CVE-2021-3711", "package_state": [{"cpe": "cpe:/a:redhat:acm:2", "fix_state": "Affected", "impact": "low", "package_name": "rhacm2/management-ingress-rhel7", "product_name": "Red Hat Advanced Cluster Management for Kubernetes 2"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "openssl", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "openssl098e", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "openssl", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "openssl098e", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "compat-openssl10", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "openssl", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "openssl", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:jboss_core_services:1", "fix_state": "Not affected", "package_name": "openssl", "product_name": "Red Hat JBoss Core Services"}, {"cpe": "cpe:/a:redhat:jboss_enterprise_web_server:3", "fix_state": "Not affected", "package_name": "openssl", "product_name": "Red Hat JBoss Web Server 3"}, {"cpe": "cpe:/a:redhat:jboss_enterprise_web_server:5", "fix_state": "Not affected", "package_name": "openssl", "product_name": "Red Hat JBoss Web Server 5"}, {"cpe": "cpe:/o:redhat:rhev_hypervisor:4", "fix_state": "Not affected", "package_name": "redhat-virtualization-host", "product_name": "Red Hat Virtualization 4"}], "public_date": "2021-08-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-3711\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-3711\nhttps://www.openssl.org/news/secadv/20210824.txt"], "statement": "OpenSSL packages shipped with Red Hat Enterprise Linux 8 are not compiled with support for SM2 algorithm and therefore are not affected by this flaw. Packages shipped with Red Hat Enterprise Linux 7 and older do not support the SM2 algorithm. \nThe Red Hat Advanced Cluster Management for Kubernetes 2.3.1 and the previous versions are using the vulnerable version of the OpenSSL library, however the vulnerable code path is not reachable.", "threat_severity": "Important", "upstream_fix": "openssl 1.1.1l"}