{ "document": { "aggregate_severity": { "namespace": "https://access.redhat.com/security/updates/classification/", "text": "Important" }, "category": "csaf_security_advisory", "csaf_version": "2.0", "distribution": { "text": "Copyright © Red Hat, Inc. All rights reserved.", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "summary", "text": "An update for openssl is now available for Red Hat Enterprise Linux 8.\n\nRed Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.", "title": "Topic" }, { "category": "general", "text": "OpenSSL is a toolkit that implements the Secure Sockets Layer (SSL) and Transport Layer Security (TLS) protocols, as well as a full-strength general-purpose cryptography library.\n\nSecurity Fix(es):\n\n* openssl: NULL pointer dereference in signature_algorithms processing (CVE-2021-3449)\n\n* openssl: CA certificate check bypass with X509_V_FLAG_X509_STRICT (CVE-2021-3450)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.", "title": "Details" }, { "category": "legal_disclaimer", "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.", "title": "Terms of Use" } ], "publisher": { "category": "vendor", "contact_details": "https://access.redhat.com/security/team/contact/", "issuing_authority": "Red Hat Product Security is responsible for vulnerability handling across all Red Hat products and services.", "name": "Red Hat Product Security", "namespace": "https://www.redhat.com" }, "references": [ { "category": "self", "summary": "https://access.redhat.com/errata/RHSA-2021:1024", "url": "https://access.redhat.com/errata/RHSA-2021:1024" }, { "category": "external", "summary": "https://access.redhat.com/security/updates/classification/#important", "url": "https://access.redhat.com/security/updates/classification/#important" }, { "category": "external", "summary": "1941547", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1941547" }, { "category": "external", "summary": "1941554", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1941554" }, { "category": "self", "summary": "Canonical URL", "url": "https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_1024.json" } ], "title": "Red Hat Security Advisory: openssl security update", "tracking": { "current_release_date": "2026-06-28T12:34:15+00:00", "generator": { "date": "2026-06-28T12:34:15+00:00", "engine": { "name": "Red Hat SDEngine", "version": "5.2.6" } }, "id": "RHSA-2021:1024", "initial_release_date": "2021-03-30T14:40:51+00:00", "revision_history": [ { "date": "2021-03-30T14:40:51+00:00", "number": "1", "summary": "Initial version" }, { "date": "2021-03-30T14:40:51+00:00", "number": "2", "summary": "Last updated version" }, { "date": "2026-06-28T12:34:15+00:00", "number": "3", "summary": "Last generated version" } ], "status": "final", "version": "3" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_name", "name": "Red Hat Enterprise Linux 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A server crash and denial of service attack could occur if a client sends a TLSv1.2 renegotiation ClientHello and omits the signature_algorithms extension but includes a signature_algorithms_cert extension. The highest threat from this vulnerability is to system availability.", "title": "Vulnerability description" }, { "category": "summary", "text": "openssl: NULL pointer dereference in signature_algorithms processing", "title": "Vulnerability summary" }, { "category": "other", "text": "This flaw only affects OpenSSL 1.1.1, older versions are not affected.", "title": "Statement" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "BaseOS-8.3.0.Z.MAIN:openssl-1:1.1.1g-15.el8_3.aarch64", "BaseOS-8.3.0.Z.MAIN:openssl-1:1.1.1g-15.el8_3.ppc64le", "BaseOS-8.3.0.Z.MAIN:openssl-1:1.1.1g-15.el8_3.s390x", "BaseOS-8.3.0.Z.MAIN:openssl-1:1.1.1g-15.el8_3.src", "BaseOS-8.3.0.Z.MAIN:openssl-1:1.1.1g-15.el8_3.x86_64", 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The flag that enables additional security checks of certificates present in a certificate chain was not enabled allowing a confirmation step to verify that certificates in the chain are valid CA certificates is bypassed. The highest threat from this vulnerability is to data confidentiality and integrity.", "title": "Vulnerability description" }, { "category": "summary", "text": "openssl: CA certificate check bypass with X509_V_FLAG_X509_STRICT", "title": "Vulnerability summary" }, { "category": "other", "text": "This flaw affects openssl 1.1.1h and above only, older versions are not affected by this flaw.", "title": "Statement" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "BaseOS-8.3.0.Z.MAIN:openssl-1:1.1.1g-15.el8_3.aarch64", "BaseOS-8.3.0.Z.MAIN:openssl-1:1.1.1g-15.el8_3.ppc64le", "BaseOS-8.3.0.Z.MAIN:openssl-1:1.1.1g-15.el8_3.s390x", "BaseOS-8.3.0.Z.MAIN:openssl-1:1.1.1g-15.el8_3.src", "BaseOS-8.3.0.Z.MAIN:openssl-1:1.1.1g-15.el8_3.x86_64", 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