{"dataType": "CVE_RECORD", "cveMetadata": {"state": "PUBLISHED", "cveId": "CVE-2021-23839", "assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "assignerShortName": "openssl", "dateUpdated": "2024-09-17T03:59:18.791Z", "dateReserved": "2021-01-12T00:00:00", "datePublished": "2021-02-16T16:55:17.519714Z"}, "containers": {"cna": {"title": "Incorrect SSLv2 rollback protection", "datePublic": "2021-02-16T00:00:00", "providerMetadata": {"orgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "shortName": "openssl", "dateUpdated": "2024-06-21T19:06:04.879792"}, "descriptions": [{"lang": "en", "value": "OpenSSL 1.0.2 supports SSLv2. If a client attempts to negotiate SSLv2 with a server that is configured to support both SSLv2 and more recent SSL and TLS versions then a check is made for a version rollback attack when unpadding an RSA signature. Clients that support SSL or TLS versions greater than SSLv2 are supposed to use a special form of padding. A server that supports greater than SSLv2 is supposed to reject connection attempts from a client where this special form of padding is present, because this indicates that a version rollback has occurred (i.e. both client and server support greater than SSLv2, and yet this is the version that is being requested). The implementation of this padding check inverted the logic so that the connection attempt is accepted if the padding is present, and rejected if it is absent. This means that such as server will accept a connection if a version rollback attack has occurred. Further the server will erroneously reject a connection if a normal SSLv2 connection attempt is made. Only OpenSSL 1.0.2 servers from version 1.0.2s to 1.0.2x are affected by this issue. In order to be vulnerable a 1.0.2 server must: 1) have configured SSLv2 support at compile time (this is off by default), 2) have configured SSLv2 support at runtime (this is off by default), 3) have configured SSLv2 ciphersuites (these are not in the default ciphersuite list) OpenSSL 1.1.1 does not have SSLv2 support and therefore is not vulnerable to this issue. The underlying error is in the implementation of the RSA_padding_check_SSLv23() function. This also affects the RSA_SSLV23_PADDING padding mode used by various other functions. Although 1.1.1 does not support SSLv2 the RSA_padding_check_SSLv23() function still exists, as does the RSA_SSLV23_PADDING padding mode. Applications that directly call that function or use that padding mode will encounter this issue. However since there is no support for the SSLv2 protocol in 1.1.1 this is considered a bug and not a security issue in that version. OpenSSL 1.0.2 is out of support and no longer receiving public updates. Premium support customers of OpenSSL 1.0.2 should upgrade to 1.0.2y. Other users should upgrade to 1.1.1j. 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Katz and Joel Luellwitz (Trustwave)"}], "metrics": [{"other": {"content": {"lang": "eng", "url": "https://www.openssl.org/policies/secpolicy.html#Low", "value": "Low"}, "type": "unknown"}}], "problemTypes": [{"descriptions": [{"type": "text", "lang": "en", "description": "Rollback attack"}]}]}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2024-08-01T19:19:45.526222Z", "id": "CVE-2021-23839", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-08-01T19:19:52.707Z"}}, {"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T19:14:09.228Z"}, "title": "CVE Program Container", "references": [{"url": "https://www.openssl.org/news/secadv/20210216.txt", "tags": ["x_transferred"]}, {"url": "https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=30919ab80a478f2d81f2e9acdcca3fa4740cd547", "tags": ["x_transferred"]}, {"url": "https://www.oracle.com/security-alerts/cpuApr2021.html", "tags": ["x_transferred"]}, {"url": "https://security.netapp.com/advisory/ntap-20210219-0009/", "tags": ["x_transferred"]}, {"url": "https://www.oracle.com//security-alerts/cpujul2021.html", "tags": ["x_transferred"]}, {"url": "https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44846", "tags": ["x_transferred"]}, {"url": "https://www.oracle.com/security-alerts/cpuoct2021.html", "tags": ["x_transferred"]}, {"url": "https://www.oracle.com/security-alerts/cpuapr2022.html", "tags": ["x_transferred"]}, {"url": "https://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdf", "tags": ["x_transferred"]}, {"url": "https://security.netapp.com/advisory/ntap-20240621-0006/", "tags": ["x_transferred"]}]}]}, "dataVersion": "5.1"}

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Katz and Joel Luellwitz (Trustwave)"}], "metrics": [{"other": {"type": "unknown", "content": {"url": "https://www.openssl.org/policies/secpolicy.html#Low", "lang": "eng", "value": "Low"}}}], "affected": [{"vendor": "OpenSSL", "product": "OpenSSL", "versions": [{"status": "affected", "version": "Fixed in OpenSSL 1.0.2y (Affected 1.0.2s-1.0.2x)"}]}], "datePublic": "2021-02-16T00:00:00", "references": [{"url": "https://www.openssl.org/news/secadv/20210216.txt"}, {"url": "https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=30919ab80a478f2d81f2e9acdcca3fa4740cd547"}, {"url": "https://www.oracle.com/security-alerts/cpuApr2021.html"}, {"url": "https://security.netapp.com/advisory/ntap-20210219-0009/"}, {"url": "https://www.oracle.com//security-alerts/cpujul2021.html"}, {"url": "https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44846"}, {"url": "https://www.oracle.com/security-alerts/cpuoct2021.html"}, {"url": "https://www.oracle.com/security-alerts/cpuapr2022.html"}, {"url": "https://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdf"}, {"url": "https://security.netapp.com/advisory/ntap-20240621-0006/"}], "descriptions": [{"lang": "en", "value": "OpenSSL 1.0.2 supports SSLv2. 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Only OpenSSL 1.0.2 servers from version 1.0.2s to 1.0.2x are affected by this issue. In order to be vulnerable a 1.0.2 server must: 1) have configured SSLv2 support at compile time (this is off by default), 2) have configured SSLv2 support at runtime (this is off by default), 3) have configured SSLv2 ciphersuites (these are not in the default ciphersuite list) OpenSSL 1.1.1 does not have SSLv2 support and therefore is not vulnerable to this issue. The underlying error is in the implementation of the RSA_padding_check_SSLv23() function. This also affects the RSA_SSLV23_PADDING padding mode used by various other functions. Although 1.1.1 does not support SSLv2 the RSA_padding_check_SSLv23() function still exists, as does the RSA_SSLV23_PADDING padding mode. Applications that directly call that function or use that padding mode will encounter this issue. However since there is no support for the SSLv2 protocol in 1.1.1 this is considered a bug and not a security issue in that version. OpenSSL 1.0.2 is out of support and no longer receiving public updates. Premium support customers of OpenSSL 1.0.2 should upgrade to 1.0.2y. Other users should upgrade to 1.1.1j. Fixed in OpenSSL 1.0.2y (Affected 1.0.2s-1.0.2x)."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "text", "description": "Rollback attack"}]}], "providerMetadata": {"orgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "shortName": "openssl", "dateUpdated": "2024-06-21T19:06:04.879792"}}}, "cveMetadata": {"cveId": "CVE-2021-23839", "state": "PUBLISHED", "dateUpdated": "2024-09-17T03:59:18.791Z", "dateReserved": "2021-01-12T00:00:00", "assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "datePublished": "2021-02-16T16:55:17.519714Z", "assignerShortName": "openssl"}, "dataVersion": "5.1"}

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If a client attempts to negotiate SSLv2 with a server that is configured to support both SSLv2 and more recent SSL and TLS versions then a check is made for a version rollback attack when unpadding an RSA signature. Clients that support SSL or TLS versions greater than SSLv2 are supposed to use a special form of padding. A server that supports greater than SSLv2 is supposed to reject connection attempts from a client where this special form of padding is present, because this indicates that a version rollback has occurred (i.e. both client and server support greater than SSLv2, and yet this is the version that is being requested). The implementation of this padding check inverted the logic so that the connection attempt is accepted if the padding is present, and rejected if it is absent. This means that such as server will accept a connection if a version rollback attack has occurred. Further the server will erroneously reject a connection if a normal SSLv2 connection attempt is made. Only OpenSSL 1.0.2 servers from version 1.0.2s to 1.0.2x are affected by this issue. In order to be vulnerable a 1.0.2 server must: 1) have configured SSLv2 support at compile time (this is off by default), 2) have configured SSLv2 support at runtime (this is off by default), 3) have configured SSLv2 ciphersuites (these are not in the default ciphersuite list) OpenSSL 1.1.1 does not have SSLv2 support and therefore is not vulnerable to this issue. The underlying error is in the implementation of the RSA_padding_check_SSLv23() function. This also affects the RSA_SSLV23_PADDING padding mode used by various other functions. Although 1.1.1 does not support SSLv2 the RSA_padding_check_SSLv23() function still exists, as does the RSA_SSLV23_PADDING padding mode. Applications that directly call that function or use that padding mode will encounter this issue. However since there is no support for the SSLv2 protocol in 1.1.1 this is considered a bug and not a security issue in that version. OpenSSL 1.0.2 is out of support and no longer receiving public updates. Premium support customers of OpenSSL 1.0.2 should upgrade to 1.0.2y. Other users should upgrade to 1.1.1j. Fixed in OpenSSL 1.0.2y (Affected 1.0.2s-1.0.2x)."}, {"lang": "es", "value": "OpenSSL versi\u00f3n 1.0.2 soporta SSLv2. Si un cliente intenta negociar SSLv2 con un servidor que est\u00e1 configurado para soportar tanto SSLv2 como versiones m\u00e1s recientes de SSL y TLS, entonces se hace una comprobaci\u00f3n de un ataque de retroceso de versi\u00f3n cuando se deshace una firma RSA. Los clientes que soportan versiones de SSL o TLS superiores a SSLv2 deben usar una forma especial de relleno. Un servidor que soporta una versi\u00f3n superior a SSLv2 debe rechazar los intentos de conexi\u00f3n de un cliente en el que est\u00e9 presente esta forma especial de relleno, porque esto indica que se ha producido un retroceso de versi\u00f3n (es decir, tanto el cliente como el servidor soportan una versi\u00f3n superior a SSLv2, y sin embargo esta es la versi\u00f3n que se est\u00e1 requiriendo). La implementaci\u00f3n de esta comprobaci\u00f3n de padding invirti\u00f3 la l\u00f3gica para que el intento de conexi\u00f3n sea aceptado si el padding est\u00e1 presente, y rechazado si est\u00e1 ausente. Esto significa que tal servidor aceptar\u00e1 una conexi\u00f3n si se ha producido un ataque de retroceso de versi\u00f3n. Adem\u00e1s, el servidor rechazar\u00e1 err\u00f3neamente una conexi\u00f3n si se realiza un intento de conexi\u00f3n SSLv2 normal. S\u00f3lo los servidores OpenSSL versi\u00f3n 1.0.2 desde la versi\u00f3n 1.0.2s hasta la 1.0.2x est\u00e1n afectados por este problema. Para ser vulnerable, un servidor versi\u00f3n 1.0.2 debe 1) haber configurado la compatibilidad con SSLv2 en tiempo de compilaci\u00f3n (est\u00e1 desactivada por defecto), 2) haber configurado la compatibilidad con SSLv2 en tiempo de ejecuci\u00f3n (est\u00e1 deshabilitada por defecto), 3) haber configurado los ciphersuites de SSLv2 (no est\u00e1n en la lista de ciphersuites por defecto) OpenSSL versi\u00f3n 1.1.1 no presenta compatibilidad con SSLv2 y, por tanto, no es vulnerable a este problema. El error subyacente est\u00e1 en la implementaci\u00f3n de la funci\u00f3n RSA_padding_check_SSLv23(). Esto tambi\u00e9n afecta al modo de relleno RSA_SSLV23_PADDING usado por otras funciones. Aunque la versi\u00f3n 1.1.1 no soporta SSLv2, la funci\u00f3n RSA_padding_check_SSLv23() sigue existiendo, al igual que el modo de relleno RSA_SSLV23_PADDING. Las aplicaciones que llamen directamente a esa funci\u00f3n o utilicen ese modo de relleno se encontrar\u00e1n con este problema. Sin embargo, como no existe soporte para el protocolo SSLv2 en la versi\u00f3n 1.1.1, esto se considera un error y no un problema de seguridad en esa versi\u00f3n. OpenSSL versi\u00f3n 1.0.2 est\u00e1 fuera de soporte y ya no recibe actualizaciones p\u00fablicas. Los clientes de soporte Premium de OpenSSL versi\u00f3n 1.0.2 deben actualizar a la versi\u00f3n 1.0.2y. Los dem\u00e1s usuarios deben actualizar a la versi\u00f3n 1.1.1j. Corregido en OpenSSL versi\u00f3n 1.0.2y (Afect\u00f3 versiones 1.0.2s-1.0.2x)"}], "id": "CVE-2021-23839", "lastModified": "2024-06-21T19:15:16.830", "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"}]}, "published": "2021-02-16T17:15:13.190", "references": [{"source": "openssl-security@openssl.org", "tags": ["Patch", "Third Party Advisory"], "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdf"}, {"source": "openssl-security@openssl.org", "url": "https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=30919ab80a478f2d81f2e9acdcca3fa4740cd547"}, {"source": "openssl-security@openssl.org", "tags": ["Third Party Advisory"], "url": "https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44846"}, {"source": "openssl-security@openssl.org", "tags": ["Third Party Advisory"], "url": "https://security.netapp.com/advisory/ntap-20210219-0009/"}, {"source": "openssl-security@openssl.org", "url": "https://security.netapp.com/advisory/ntap-20240621-0006/"}, {"source": "openssl-security@openssl.org", "tags": ["Vendor Advisory"], "url": "https://www.openssl.org/news/secadv/20210216.txt"}, {"source": "openssl-security@openssl.org", "tags": ["Patch", "Third Party Advisory"], "url": "https://www.oracle.com//security-alerts/cpujul2021.html"}, {"source": "openssl-security@openssl.org", "tags": ["Patch", "Third Party Advisory"], "url": "https://www.oracle.com/security-alerts/cpuApr2021.html"}, {"source": "openssl-security@openssl.org", "tags": ["Patch", "Third Party Advisory"], "url": "https://www.oracle.com/security-alerts/cpuapr2022.html"}, {"source": "openssl-security@openssl.org", "tags": ["Patch", "Third Party Advisory"], "url": "https://www.oracle.com/security-alerts/cpuoct2021.html"}], "sourceIdentifier": "openssl-security@openssl.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-327"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2021:3016", "cpe": "cpe:/a:redhat:acm:2.3::el7", "package": "rhacm2/management-ingress-rhel7:v2.3.0-36", "product_name": "Red Hat Advanced Cluster Management for Kubernetes 2.3 for RHEL 7", "release_date": "2021-08-06T00:00:00Z"}], "bugzilla": {"description": "openssl: incorrect SSLv2 rollback protection", "id": "1930294", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1930294"}, "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:N/I:L/A:N", "status": "verified"}, "details": ["OpenSSL 1.0.2 supports SSLv2. If a client attempts to negotiate SSLv2 with a server that is configured to support both SSLv2 and more recent SSL and TLS versions then a check is made for a version rollback attack when unpadding an RSA signature. Clients that support SSL or TLS versions greater than SSLv2 are supposed to use a special form of padding. A server that supports greater than SSLv2 is supposed to reject connection attempts from a client where this special form of padding is present, because this indicates that a version rollback has occurred (i.e. both client and server support greater than SSLv2, and yet this is the version that is being requested). The implementation of this padding check inverted the logic so that the connection attempt is accepted if the padding is present, and rejected if it is absent. This means that such as server will accept a connection if a version rollback attack has occurred. Further the server will erroneously reject a connection if a normal SSLv2 connection attempt is made. Only OpenSSL 1.0.2 servers from version 1.0.2s to 1.0.2x are affected by this issue. In order to be vulnerable a 1.0.2 server must: 1) have configured SSLv2 support at compile time (this is off by default), 2) have configured SSLv2 support at runtime (this is off by default), 3) have configured SSLv2 ciphersuites (these are not in the default ciphersuite list) OpenSSL 1.1.1 does not have SSLv2 support and therefore is not vulnerable to this issue. The underlying error is in the implementation of the RSA_padding_check_SSLv23() function. This also affects the RSA_SSLV23_PADDING padding mode used by various other functions. Although 1.1.1 does not support SSLv2 the RSA_padding_check_SSLv23() function still exists, as does the RSA_SSLV23_PADDING padding mode. Applications that directly call that function or use that padding mode will encounter this issue. However since there is no support for the SSLv2 protocol in 1.1.1 this is considered a bug and not a security issue in that version. OpenSSL 1.0.2 is out of support and no longer receiving public updates. Premium support customers of OpenSSL 1.0.2 should upgrade to 1.0.2y. Other users should upgrade to 1.1.1j. Fixed in OpenSSL 1.0.2y (Affected 1.0.2s-1.0.2x).", "A flaw was found in openssl. OpenSSL 1.0.2 supports SSLv2. If a client attempts to negotiate SSLv2 with a server that is configured to support both SSLv2 and more recent SSL and TLS versions then a check is made for a version rollback attack when unpadding an RSA signature. However since there is no support for the SSLv2 protocol in 1.1.1 this is considered a bug and not a security issue in that version. OpenSSL 1.0.2 is out of support and no longer receiving public updates. Premium support customers of OpenSSL 1.0.2 should upgrade to 1.0.2y. Other users should upgrade to 1.1.1j. Fixed in OpenSSL 1.0.2y (Affected 1.0.2s-1.0.2x)."], "name": "CVE-2021-23839", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "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_application_platform:6", "fix_state": "Out of support scope", "package_name": "openssl", "product_name": "Red Hat JBoss Enterprise Application Platform 6"}], "public_date": "2021-02-16T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-23839\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-23839"], "statement": "Versions of OpenSSL packages shipped with Red Hat Enterprise Linux 7.4 and later do not support SSLv2 and therefore are not affected by this flaw.", "threat_severity": "Low", "upstream_fix": "openssl 1.1.1j, openssl 1.0.2y"}