CVE-2021-23841

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This may subsequently result in a NULL pointer deref and a crash leading to a potential denial of service attack. The function X509_issuer_and_serial_hash() is never directly called by OpenSSL itself so applications are only vulnerable if they use this function directly and they use it on certificates that may have been obtained from untrusted sources. OpenSSL versions 1.1.1i and below are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1j. OpenSSL versions 1.0.2x and below are affected by this issue. However 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 1.1.1j (Affected 1.1.1-1.1.1i). 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However it fails to correctly handle any errors that may occur while parsing the issuer field (which might occur if the issuer field is maliciously constructed). This may subsequently result in a NULL pointer deref and a crash leading to a potential denial of service attack. The function X509_issuer_and_serial_hash() is never directly called by OpenSSL itself so applications are only vulnerable if they use this function directly and they use it on certificates that may have been obtained from untrusted sources. OpenSSL versions 1.1.1i and below are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1j. OpenSSL versions 1.0.2x and below are affected by this issue. However 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 1.1.1j (Affected 1.1.1-1.1.1i). Fixed in OpenSSL 1.0.2y (Affected 1.0.2-1.0.2x)."}, {"lang": "es", "value": "La funci\u00f3n de la API p\u00fablica de OpenSSL X509_issuer_and_serial_hash() intenta crear un valor hash \u00fanico basado en los datos del emisor y del n\u00famero de serie contenidos en un certificado X509. Sin embargo, no gestiona correctamente los errores que puedan producirse al analizar el campo del emisor (lo que podr\u00eda ocurrir si el campo del emisor se construye de forma maliciosa). Esto puede dar lugar a un desv\u00edo de puntero NULL y a un fallo que conduzca a un posible ataque de denegaci\u00f3n de servicio. La funci\u00f3n X509_issuer_and_serial_hash() nunca es llamada directamente por OpenSSL, por lo que las aplicaciones s\u00f3lo son vulnerables si utilizan esta funci\u00f3n directamente y lo hacen con certificados que pueden haber sido obtenidos de fuentes no fiables. Las versiones de OpenSSL 1.1.1i y posteriores est\u00e1n afectadas por este problema. Los usuarios de estas versiones deber\u00edan actualizar a OpenSSL 1.1.1j. Las versiones de OpenSSL 1.0.2x e inferiores se ven afectadas por este problema. Sin embargo, OpenSSL 1.0.2 est\u00e1 fuera de soporte y ya no recibe actualizaciones p\u00fablicas. Los clientes con soporte Premium de OpenSSL 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 1.1.1j (Afectado 1.1.1-1.1.1i). Corregido en OpenSSL 1.0.2y (Afectado 1.0.2-1.0.2x)"}], "id": "CVE-2021-23841", "lastModified": "2026-06-17T03:38:54.823", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 4.3, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:P", "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": "HIGH", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-23841", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-06-26T20:18:08.118870Z", "version": "2.0.3"}}]}, "published": "2021-02-16T17:15:13.377", "references": [{"source": "openssl-security@openssl.org", "tags": ["Mailing List", "Third Party Advisory"], "url": "http://seclists.org/fulldisclosure/2021/May/67"}, {"source": "openssl-security@openssl.org", "tags": ["Mailing List", "Third Party Advisory"], "url": "http://seclists.org/fulldisclosure/2021/May/68"}, {"source": "openssl-security@openssl.org", "tags": ["Mailing List", "Third Party Advisory"], "url": "http://seclists.org/fulldisclosure/2021/May/70"}, {"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=122a19ab48091c657f7cb1fb3af9fc07bd557bbf"}, {"source": "openssl-security@openssl.org", "url": "https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=8252ee4d90f3f2004d3d0aeeed003ad49c9a7807"}, {"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.gentoo.org/glsa/202103-03"}, {"source": "openssl-security@openssl.org", "tags": ["Third Party Advisory"], "url": "https://security.netapp.com/advisory/ntap-20210219-0009/"}, {"source": "openssl-security@openssl.org", "tags": ["Third Party Advisory"], "url": 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"2021-11-30T00:00:00Z"}, {"advisory": "RHSA-2021:4861", "cpe": "cpe:/a:redhat:jboss_enterprise_web_server:5.6::el8", "package": "jws5-tomcat-native-0:1.2.30-3.redhat_3.el8jws", "product_name": "Red Hat JBoss Web Server 5.6 on RHEL 8", "release_date": "2021-11-30T00:00:00Z"}, {"advisory": "RHSA-2021:4861", "cpe": "cpe:/a:redhat:jboss_enterprise_web_server:5.6::el8", "package": "jws5-tomcat-vault-0:1.1.8-4.Final_redhat_00004.1.el8jws", "product_name": "Red Hat JBoss Web Server 5.6 on RHEL 8", "release_date": "2021-11-30T00:00:00Z"}, {"advisory": "RHSA-2021:4613", "cpe": "cpe:/a:redhat:jboss_core_services:1", "package": "jbcs-httpd24-openssl", "product_name": "Text-Only JBCS", "release_date": "2021-11-10T00:00:00Z"}], "bugzilla": {"description": "openssl: NULL pointer dereference in X509_issuer_and_serial_hash()", "id": "1930310", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1930310"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.9", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-476", "details": ["The OpenSSL public API function X509_issuer_and_serial_hash() attempts to create a unique hash value based on the issuer and serial number data contained within an X509 certificate. However it fails to correctly handle any errors that may occur while parsing the issuer field (which might occur if the issuer field is maliciously constructed). This may subsequently result in a NULL pointer deref and a crash leading to a potential denial of service attack. The function X509_issuer_and_serial_hash() is never directly called by OpenSSL itself so applications are only vulnerable if they use this function directly and they use it on certificates that may have been obtained from untrusted sources. OpenSSL versions 1.1.1i and below are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1j. OpenSSL versions 1.0.2x and below are affected by this issue. However 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 1.1.1j (Affected 1.1.1-1.1.1i). Fixed in OpenSSL 1.0.2y (Affected 1.0.2-1.0.2x).", "The OpenSSL public API function X509_issuer_and_serial_hash() attempts to create a unique hash value based on the issuer and serial number data contained within an X509 certificate. However it fails to correctly handle any errors that may occur while parsing the issuer field (which might occur if the issuer field is maliciously constructed). This may subsequently result in a NULL pointer deref and a crash leading to a potential denial of service attack."], "mitigation": {"lang": "en:us", "value": "As per upstream \"The function X509_issuer_and_serial_hash() is never directly called by OpenSSL itself so applications are only vulnerable if they use this function directly and they use it on certificates that may have been obtained from untrusted sources.\""}, "name": "CVE-2021-23841", "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": "Out of support scope", "package_name": "openssl098e", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Will not fix", "package_name": "openssl098e", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "ovmf", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "package_name": "compat-openssl10", "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_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-2021-23841\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-23841\nhttps://www.openssl.org/news/secadv/20210216.txt"], "statement": "This is a a null pointer dereference in the X509_issuer_and_serial_hash() function, which can result in crash if called by an application compiled with OpenSSL, by passing a specially-crafted certificate. OpenSSL internally does not use this function.", "threat_severity": "Moderate"}

{}