{ "document": { "aggregate_severity": { "text": "High" }, "category": "csaf_vex", "csaf_version": "2.0", "distribution": { "text": "TuxCare License Agreement", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "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 Cloud Linux Inc. and provide a link to the original.", "title": "Terms of Use" } ], "publisher": { "category": "vendor", "contact_details": "https://tuxcare.com/contact/", "name": "TuxCare", "namespace": "https://tuxcare.com/" }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://security.tuxcare.com/csaf/v2/els_os/ubuntu18.04els/vex/2023/cve-2023-4807-els_os-ubuntu18_04els.json" } ], "tracking": { "current_release_date": "2026-06-13T08:40:43Z", "generator": { "date": "2026-06-14T03:46:13Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2023-4807-ELS_OS-UBUNTU18.04ELS", "initial_release_date": "2023-09-08T12:15:00Z", "revision_history": [ { "date": "2023-09-08T12:15:00Z", "number": "1", "summary": "Initial version" }, { "date": "2025-11-29T14:42:50Z", "number": "2", "summary": "Official Publication" }, { "date": "2025-12-23T22:15:38Z", "number": "3", "summary": "Update document" }, { "date": "2026-06-13T08:40:43Z", "number": "4", "summary": "Update document" } ], "status": "final", "version": "4" }, "title": "Security update on CVE-2023-4807" }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_name", "name": "Ubuntu 18.04", "product": { "name": "Ubuntu 18.04", "product_id": "Ubuntu-18", "product_identification_helper": { "cpe": "cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*" } } } ], "category": "product_family", "name": "Ubuntu" } ], "category": "vendor", "name": "Canonical Ltd." }, { "branches": [ { "branches": [ { "category": "product_version", "name": "libssl-dev-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els1.amd64", "product": { "name": "libssl-dev-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els1.amd64", "product_id": "libssl-dev-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els1.amd64", "product_identification_helper": { "purl": "pkg:deb/cloudlinux/libssl-dev@1.1.1-1ubuntu2.1~18.04.23%2Btuxcare.els1?arch=amd64" } 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"full_product_name": { "name": "libssl1.1-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els10.amd64 as a component of Ubuntu 18.04", "product_id": "Ubuntu-18:libssl1.1-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els10.amd64" }, "product_reference": "libssl1.1-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els10.amd64", "relates_to_product_reference": "Ubuntu-18" }, { "category": "default_component_of", "full_product_name": { "name": "libssl-dev-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els10.amd64 as a component of Ubuntu 18.04", "product_id": "Ubuntu-18:libssl-dev-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els10.amd64" }, "product_reference": "libssl-dev-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els10.amd64", "relates_to_product_reference": "Ubuntu-18" }, { "category": "default_component_of", "full_product_name": { "name": "libssl-doc-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els10.all as a component of Ubuntu 18.04", "product_id": "Ubuntu-18:libssl-doc-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els10.all" }, "product_reference": "libssl-doc-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els10.all", "relates_to_product_reference": "Ubuntu-18" }, { "category": "default_component_of", "full_product_name": { "name": "openssl-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els10.amd64 as a component of Ubuntu 18.04", "product_id": "Ubuntu-18:openssl-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els10.amd64" }, "product_reference": "openssl-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els10.amd64", "relates_to_product_reference": "Ubuntu-18" } ] }, "vulnerabilities": [ { "cve": "CVE-2023-4807", "cwe": { "id": "CWE-440", "name": "Expected Behavior Violation" }, "notes": [ { "category": "description", "text": "Issue summary: The POLY1305 MAC (message authentication code) implementation\ncontains a bug that might corrupt the internal state of applications on the\nWindows 64 platform when running on newer X86_64 processors supporting the\nAVX512-IFMA instructions.\n\nImpact summary: If in an application that uses the OpenSSL library an attacker\ncan influence whether the POLY1305 MAC algorithm is used, the application\nstate might be corrupted with various application dependent consequences.\n\nThe POLY1305 MAC (message authentication code) implementation in OpenSSL does\nnot save the contents of non-volatile XMM registers on Windows 64 platform\nwhen calculating the MAC of data larger than 64 bytes. Before returning to\nthe caller all the XMM registers are set to zero rather than restoring their\nprevious content. The vulnerable code is used only on newer x86_64 processors\nsupporting the AVX512-IFMA instructions.\n\nThe consequences of this kind of internal application state corruption can\nbe various - from no consequences, if the calling application does not\ndepend on the contents of non-volatile XMM registers at all, to the worst\nconsequences, where the attacker could get complete control of the application\nprocess. However given the contents of the registers are just zeroized so\nthe attacker cannot put arbitrary values inside, the most likely consequence,\nif any, would be an incorrect result of some application dependent\ncalculations or a crash leading to a denial of service.\n\nThe POLY1305 MAC algorithm is most frequently used as part of the\nCHACHA20-POLY1305 AEAD (authenticated encryption with associated data)\nalgorithm. The most common usage of this AEAD cipher is with TLS protocol\nversions 1.2 and 1.3 and a malicious client can influence whether this AEAD\ncipher is used by the server. This implies that server applications using\nOpenSSL can be potentially impacted. However we are currently not aware of\nany concrete application that would be affected by this issue therefore we\nconsider this a Low severity security issue.\n\nAs a workaround the AVX512-IFMA instructions support can be disabled at\nruntime by setting the environment variable OPENSSL_ia32cap:\n\n OPENSSL_ia32cap=:~0x200000\n\nThe FIPS provider is not affected by this issue.", "title": "Vulnerability description" }, { "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" }, { "category": "other", "text": "TuxCare has assessed that this vulnerability does not impact any currently supported TuxCare products. This evaluation may change as new information becomes available. For additional details regarding this vulnerability and affected products, refer to the provided references.", "title": "Statement" } ], "product_status": { "known_not_affected": [ "Ubuntu-18:libssl-dev-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els1.amd64", "Ubuntu-18:libssl-dev-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els10.amd64", "Ubuntu-18:libssl-dev-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els2.amd64", "Ubuntu-18:libssl-dev-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els3.amd64", "Ubuntu-18:libssl-dev-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els4.amd64", "Ubuntu-18:libssl-dev-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els7.amd64", "Ubuntu-18:libssl-dev-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els8.amd64", "Ubuntu-18:libssl-dev-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els9.amd64", "Ubuntu-18:libssl-doc-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els1.all", "Ubuntu-18:libssl-doc-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els10.all", "Ubuntu-18:libssl-doc-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els2.all", "Ubuntu-18:libssl-doc-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els3.all", "Ubuntu-18:libssl-doc-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els4.all", "Ubuntu-18:libssl-doc-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els7.all", "Ubuntu-18:libssl-doc-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els8.all", "Ubuntu-18:libssl-doc-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els9.all", "Ubuntu-18:libssl1.1-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els1.amd64", "Ubuntu-18:libssl1.1-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els10.amd64", "Ubuntu-18:libssl1.1-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els2.amd64", "Ubuntu-18:libssl1.1-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els3.amd64", "Ubuntu-18:libssl1.1-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els4.amd64", "Ubuntu-18:libssl1.1-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els7.amd64", "Ubuntu-18:libssl1.1-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els8.amd64", "Ubuntu-18:libssl1.1-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els9.amd64", "Ubuntu-18:openssl-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els1.amd64", "Ubuntu-18:openssl-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els10.amd64", "Ubuntu-18:openssl-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els2.amd64", "Ubuntu-18:openssl-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els3.amd64", "Ubuntu-18:openssl-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els4.amd64", "Ubuntu-18:openssl-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els7.amd64", "Ubuntu-18:openssl-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els8.amd64", "Ubuntu-18:openssl-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els9.amd64" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2023-4807" }, { "category": "external", "summary": "https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=4bfac4471f53c4f74c8d81020beb938f92d84ca5", "url": "https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=4bfac4471f53c4f74c8d81020beb938f92d84ca5" }, { "category": "external", "summary": "https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=6754de4a121ec7f261b16723180df6592cbb4508", "url": "https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=6754de4a121ec7f261b16723180df6592cbb4508" }, { "category": "external", "summary": "https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=a632d534c73eeb3e3db8c7540d811194ef7c79ff", "url": "https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=a632d534c73eeb3e3db8c7540d811194ef7c79ff" }, { "category": "external", "summary": "https://www.openssl.org/news/secadv/20230908.txt", "url": "https://www.openssl.org/news/secadv/20230908.txt" }, { "category": "external", "summary": "https://security.netapp.com/advisory/ntap-20230921-0001/", "url": "https://security.netapp.com/advisory/ntap-20230921-0001/" } ], "release_date": "2023-09-08T12:15:00Z", "scores": [ { "cvss_v3": { "attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1" }, "products": [ "Ubuntu-18:libssl-dev-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els1.amd64", "Ubuntu-18:libssl-dev-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els10.amd64", "Ubuntu-18:libssl-dev-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els2.amd64", "Ubuntu-18:libssl-dev-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els3.amd64", "Ubuntu-18:libssl-dev-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els4.amd64", "Ubuntu-18:libssl-dev-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els7.amd64", "Ubuntu-18:libssl-dev-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els8.amd64", "Ubuntu-18:libssl-dev-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els9.amd64", "Ubuntu-18:libssl-doc-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els1.all", "Ubuntu-18:libssl-doc-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els10.all", 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"Ubuntu-18:openssl-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els1.amd64", "Ubuntu-18:openssl-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els10.amd64", "Ubuntu-18:openssl-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els2.amd64", "Ubuntu-18:openssl-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els3.amd64", "Ubuntu-18:openssl-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els4.amd64", "Ubuntu-18:openssl-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els7.amd64", "Ubuntu-18:openssl-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els8.amd64", "Ubuntu-18:openssl-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els9.amd64" ] } ], "threats": [ { "category": "impact", "details": "Important" }, { "category": "impact", "date": "2026-06-12T12:58:02.753010Z", "details": "Not affected: This flaw exists only in the Windows 64-bit OpenSSL POLY1305 implementation on x86_64 CPUs with AVX512-IFMA, where the Windows calling convention requires preserving non‑volatile XMM registers that the affected code fails to restore. Linux builds do not use this Windows‑specific code path, so the vulnerable behavior cannot be triggered in Linux-based VMs or bare‑metal servers.", "product_ids": [ "Ubuntu-18:libssl-dev-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els1.amd64", "Ubuntu-18:libssl-dev-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els10.amd64", "Ubuntu-18:libssl-dev-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els2.amd64", "Ubuntu-18:libssl-dev-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els3.amd64", "Ubuntu-18:libssl-dev-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els4.amd64", "Ubuntu-18:libssl-dev-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els7.amd64", "Ubuntu-18:libssl-dev-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els8.amd64", "Ubuntu-18:libssl-dev-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els9.amd64", "Ubuntu-18:libssl-doc-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els1.all", "Ubuntu-18:libssl-doc-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els10.all", "Ubuntu-18:libssl-doc-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els2.all", "Ubuntu-18:libssl-doc-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els3.all", "Ubuntu-18:libssl-doc-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els4.all", "Ubuntu-18:libssl-doc-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els7.all", "Ubuntu-18:libssl-doc-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els8.all", "Ubuntu-18:libssl-doc-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els9.all", "Ubuntu-18:libssl1.1-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els1.amd64", "Ubuntu-18:libssl1.1-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els10.amd64", "Ubuntu-18:libssl1.1-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els2.amd64", "Ubuntu-18:libssl1.1-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els3.amd64", "Ubuntu-18:libssl1.1-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els4.amd64", "Ubuntu-18:libssl1.1-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els7.amd64", "Ubuntu-18:libssl1.1-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els8.amd64", "Ubuntu-18:libssl1.1-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els9.amd64", "Ubuntu-18:openssl-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els1.amd64", "Ubuntu-18:openssl-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els10.amd64", "Ubuntu-18:openssl-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els2.amd64", "Ubuntu-18:openssl-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els3.amd64", "Ubuntu-18:openssl-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els4.amd64", "Ubuntu-18:openssl-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els7.amd64", "Ubuntu-18:openssl-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els8.amd64", "Ubuntu-18:openssl-0:1.1.1-1ubuntu2.1~18.04.23+tuxcare.els9.amd64" ] } ] } ] }