{ "document": { "aggregate_severity": { "text": "Medium" }, "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-2023-6918-els_os-ubuntu18_04els.json" } ], "tracking": { "current_release_date": "2026-07-19T13:21:07Z", "generator": { "date": "2026-07-19T13:21:07Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2023-6918-ELS_OS-UBUNTU18.04ELS", "initial_release_date": "2023-12-19T00:15:00Z", "revision_history": [ { "date": "2023-12-19T00:15:00Z", "number": "1", "summary": "Initial version" }, { "date": "2026-06-13T08:34:11Z", "number": "2", "summary": "Official Publication" }, { "date": "2026-07-19T13:21:07Z", "number": "3", "summary": "Update document" } ], "status": "final", "version": "3" }, "title": "Security update on CVE-2023-6918" }, "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": "libssh2-1-dev-0:1.8.0-1ubuntu0.1+tuxcare.els1.amd64", "product": { "name": "libssh2-1-dev-0:1.8.0-1ubuntu0.1+tuxcare.els1.amd64", "product_id": "libssh2-1-dev-0:1.8.0-1ubuntu0.1+tuxcare.els1.amd64", "product_identification_helper": { "purl": "pkg:deb/cloudlinux/libssh2-1-dev@1.8.0-1ubuntu0.1%2Btuxcare.els1?arch=amd64" } } }, { "category": "product_version", "name": "libssh2-1-0:1.8.0-1ubuntu0.1+tuxcare.els1.amd64", "product": { "name": "libssh2-1-0:1.8.0-1ubuntu0.1+tuxcare.els1.amd64", "product_id": "libssh2-1-0:1.8.0-1ubuntu0.1+tuxcare.els1.amd64", "product_identification_helper": { "purl": "pkg:deb/cloudlinux/libssh2-1@1.8.0-1ubuntu0.1%2Btuxcare.els1?arch=amd64" } } }, { "category": "product_version", "name": "libssh2-1-0:1.8.0-1ubuntu0.1+tuxcare.els2.amd64", "product": { "name": "libssh2-1-0:1.8.0-1ubuntu0.1+tuxcare.els2.amd64", "product_id": "libssh2-1-0:1.8.0-1ubuntu0.1+tuxcare.els2.amd64", "product_identification_helper": { "purl": "pkg:deb/cloudlinux/libssh2-1@1.8.0-1ubuntu0.1%2Btuxcare.els2?arch=amd64" } } }, { "category": "product_version", "name": "libssh2-1-dev-0:1.8.0-1ubuntu0.1+tuxcare.els2.amd64", "product": { "name": "libssh2-1-dev-0:1.8.0-1ubuntu0.1+tuxcare.els2.amd64", "product_id": "libssh2-1-dev-0:1.8.0-1ubuntu0.1+tuxcare.els2.amd64", "product_identification_helper": { "purl": "pkg:deb/cloudlinux/libssh2-1-dev@1.8.0-1ubuntu0.1%2Btuxcare.els2?arch=amd64" } } } ], "category": "architecture", "name": "amd64" } ], "category": "vendor", "name": "CloudLinux" } ], "relationships": [ { "category": "default_component_of", "full_product_name": { "name": "libssh2-1-dev-0:1.8.0-1ubuntu0.1+tuxcare.els1.amd64 as a component of Ubuntu 18.04", "product_id": "Ubuntu-18:libssh2-1-dev-0:1.8.0-1ubuntu0.1+tuxcare.els1.amd64" }, "product_reference": "libssh2-1-dev-0:1.8.0-1ubuntu0.1+tuxcare.els1.amd64", "relates_to_product_reference": "Ubuntu-18" }, { "category": "default_component_of", "full_product_name": { "name": "libssh2-1-0:1.8.0-1ubuntu0.1+tuxcare.els1.amd64 as a component of Ubuntu 18.04", "product_id": "Ubuntu-18:libssh2-1-0:1.8.0-1ubuntu0.1+tuxcare.els1.amd64" }, "product_reference": "libssh2-1-0:1.8.0-1ubuntu0.1+tuxcare.els1.amd64", "relates_to_product_reference": "Ubuntu-18" }, { "category": "default_component_of", "full_product_name": { "name": "libssh2-1-0:1.8.0-1ubuntu0.1+tuxcare.els2.amd64 as a component of Ubuntu 18.04", "product_id": "Ubuntu-18:libssh2-1-0:1.8.0-1ubuntu0.1+tuxcare.els2.amd64" }, "product_reference": "libssh2-1-0:1.8.0-1ubuntu0.1+tuxcare.els2.amd64", "relates_to_product_reference": "Ubuntu-18" }, { "category": "default_component_of", "full_product_name": { "name": "libssh2-1-dev-0:1.8.0-1ubuntu0.1+tuxcare.els2.amd64 as a component of Ubuntu 18.04", "product_id": "Ubuntu-18:libssh2-1-dev-0:1.8.0-1ubuntu0.1+tuxcare.els2.amd64" }, "product_reference": "libssh2-1-dev-0:1.8.0-1ubuntu0.1+tuxcare.els2.amd64", "relates_to_product_reference": "Ubuntu-18" } ] }, "vulnerabilities": [ { "cve": "CVE-2023-6918", "cwe": { "id": "CWE-252", "name": "Unchecked Return Value" }, "notes": [ { "category": "description", "text": "A flaw was found in the libssh implements abstract layer for message digest (MD) operations implemented by different supported crypto backends. The return values from these were not properly checked, which could cause low-memory situations failures, NULL dereferences, crashes, or usage of the uninitialized memory as an input for the KDF. In this case, non-matching keys will result in decryption/integrity failures, terminating the connection.", "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:libssh2-1-0:1.8.0-1ubuntu0.1+tuxcare.els1.amd64", "Ubuntu-18:libssh2-1-0:1.8.0-1ubuntu0.1+tuxcare.els2.amd64", "Ubuntu-18:libssh2-1-dev-0:1.8.0-1ubuntu0.1+tuxcare.els1.amd64", "Ubuntu-18:libssh2-1-dev-0:1.8.0-1ubuntu0.1+tuxcare.els2.amd64" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2023-6918" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2024:2504", "url": "https://access.redhat.com/errata/RHSA-2024:2504" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2024:3233", "url": "https://access.redhat.com/errata/RHSA-2024:3233" }, { "category": "external", "summary": "https://access.redhat.com/security/cve/CVE-2023-6918", "url": "https://access.redhat.com/security/cve/CVE-2023-6918" }, { "category": "external", "summary": "https://bugzilla.redhat.com/show_bug.cgi?id=2254997", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2254997" }, { "category": "external", "summary": "https://www.libssh.org/2023/12/18/libssh-0-10-6-and-libssh-0-9-8-security-releases/", "url": "https://www.libssh.org/2023/12/18/libssh-0-10-6-and-libssh-0-9-8-security-releases/" }, { "category": "external", "summary": "https://www.libssh.org/security/advisories/CVE-2023-6918.txt", "url": "https://www.libssh.org/security/advisories/CVE-2023-6918.txt" }, { "category": "external", "summary": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LZQVUHWVWRH73YBXUQJOD6CKHDQBU3DM/", "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LZQVUHWVWRH73YBXUQJOD6CKHDQBU3DM/" }, { "category": "external", "summary": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MKQRBF3DWMWPH36LBCOBUTSIZRTPEZXB/", "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MKQRBF3DWMWPH36LBCOBUTSIZRTPEZXB/" }, { "category": "external", "summary": "https://security.netapp.com/advisory/ntap-20250214-0009/", "url": "https://security.netapp.com/advisory/ntap-20250214-0009/" } ], "release_date": "2023-12-19T00:15:00Z", "scores": [ { "cvss_v3": { "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "version": "3.1" }, "products": [ "Ubuntu-18:libssh2-1-0:1.8.0-1ubuntu0.1+tuxcare.els1.amd64", "Ubuntu-18:libssh2-1-0:1.8.0-1ubuntu0.1+tuxcare.els2.amd64", "Ubuntu-18:libssh2-1-dev-0:1.8.0-1ubuntu0.1+tuxcare.els1.amd64", "Ubuntu-18:libssh2-1-dev-0:1.8.0-1ubuntu0.1+tuxcare.els2.amd64" ] } ], "threats": [ { "category": "impact", "details": "Moderate" }, { "category": "impact", "date": "2026-06-12T12:58:32.808590Z", "details": "Not affected. CVE-2023-6918 targets libssh’s message-digest abstraction and is scoped to the libssh package; it does not apply to the separate libssh2 project. Because the component here is libssh2 1.8.0, the vulnerable code path is absent and no patch is required.", "product_ids": [ "Ubuntu-18:libssh2-1-0:1.8.0-1ubuntu0.1+tuxcare.els1.amd64", "Ubuntu-18:libssh2-1-0:1.8.0-1ubuntu0.1+tuxcare.els2.amd64", "Ubuntu-18:libssh2-1-dev-0:1.8.0-1ubuntu0.1+tuxcare.els1.amd64", "Ubuntu-18:libssh2-1-dev-0:1.8.0-1ubuntu0.1+tuxcare.els2.amd64" ] } ] } ] }