{ "document": { "aggregate_severity": { "text": "Moderate" }, "category": "csaf_security_advisory", "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" }, { "category": "details", "text": "CVE-2023-51764: fix SMTP smuggling (backport of 2.11.11-smuggling-patch)", "title": "Details" } ], "publisher": { "category": "vendor", "contact_details": "https://tuxcare.com/contact/", "name": "TuxCare", "namespace": "https://tuxcare.com/" }, "references": [ { "category": "self", "summary": "https://cve.tuxcare.com/els/releases/CLSA-2026:1778834936", "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1778834936" }, { "category": "self", "summary": "Canonical URL", "url": "https://security.tuxcare.com/csaf/v2/els_os/oraclelinux7els/advisories/2026/clsa-2026_1778834936.json" } ], "tracking": { "current_release_date": "2026-05-15T08:49:29Z", "generator": { "date": "2026-05-15T08:49:29Z", "engine": { "name": "pyCSAF" } }, "id": "CLSA-2026:1778834936", "initial_release_date": "2026-05-15T08:49:29Z", "revision_history": [ { "date": "2026-05-15T08:49:29Z", "number": "1", "summary": "Initial version" } ], "status": "final", "version": "1" }, "title": "postfix: Fix of CVE-2023-51764" }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_name", "name": "Oracle Linux 7", "product": { "name": "Oracle Linux 7", "product_id": "Oracle-Linux-7", "product_identification_helper": { "cpe": "cpe:2.3:o:oracle:linux:7:*:*:*:*:*:*:*" } } } ], "category": "product_family", "name": "Oracle Linux" } ], "category": "vendor", "name": "Oracle Corporation" }, { "branches": [ { "branches": [ { "category": "product_version", "name": "postfix-sysvinit-2:2.10.1-9.el7.tuxcare.els1.noarch", "product": { "name": "postfix-sysvinit-2:2.10.1-9.el7.tuxcare.els1.noarch", "product_id": "postfix-sysvinit-2:2.10.1-9.el7.tuxcare.els1.noarch", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/postfix-sysvinit@2.10.1-9.el7.tuxcare.els1?arch=noarch&epoch=2" } } } ], "category": "architecture", "name": "noarch" }, { "branches": [ { "category": "product_version", "name": "postfix-2:2.10.1-9.el7.tuxcare.els1.x86_64", "product": { "name": "postfix-2:2.10.1-9.el7.tuxcare.els1.x86_64", "product_id": "postfix-2:2.10.1-9.el7.tuxcare.els1.x86_64", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/postfix@2.10.1-9.el7.tuxcare.els1?arch=x86_64&epoch=2" } } }, { "category": "product_version", "name": "postfix-perl-scripts-2:2.10.1-9.el7.tuxcare.els1.x86_64", "product": { "name": "postfix-perl-scripts-2:2.10.1-9.el7.tuxcare.els1.x86_64", "product_id": "postfix-perl-scripts-2:2.10.1-9.el7.tuxcare.els1.x86_64", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/postfix-perl-scripts@2.10.1-9.el7.tuxcare.els1?arch=x86_64&epoch=2" } } } ], "category": "architecture", "name": "x86_64" } ], "category": "vendor", "name": "TuxCare" } ], "relationships": [ { "category": "default_component_of", "full_product_name": { "name": "postfix-sysvinit-2:2.10.1-9.el7.tuxcare.els1.noarch as a component of Oracle Linux 7", "product_id": "Oracle-Linux-7:postfix-sysvinit-2:2.10.1-9.el7.tuxcare.els1.noarch" }, "product_reference": "postfix-sysvinit-2:2.10.1-9.el7.tuxcare.els1.noarch", "relates_to_product_reference": "Oracle-Linux-7" }, { "category": "default_component_of", "full_product_name": { "name": "postfix-2:2.10.1-9.el7.tuxcare.els1.x86_64 as a component of Oracle Linux 7", "product_id": "Oracle-Linux-7:postfix-2:2.10.1-9.el7.tuxcare.els1.x86_64" }, "product_reference": "postfix-2:2.10.1-9.el7.tuxcare.els1.x86_64", "relates_to_product_reference": "Oracle-Linux-7" }, { "category": "default_component_of", "full_product_name": { "name": "postfix-perl-scripts-2:2.10.1-9.el7.tuxcare.els1.x86_64 as a component of Oracle Linux 7", "product_id": "Oracle-Linux-7:postfix-perl-scripts-2:2.10.1-9.el7.tuxcare.els1.x86_64" }, "product_reference": "postfix-perl-scripts-2:2.10.1-9.el7.tuxcare.els1.x86_64", "relates_to_product_reference": "Oracle-Linux-7" } ] }, "vulnerabilities": [ { "cve": "CVE-2023-51764", "cwe": { "id": "CWE-345", "name": "Insufficient Verification of Data Authenticity" }, "notes": [ { "category": "description", "text": "Postfix through 3.8.5 allows SMTP smuggling unless configured with smtpd_data_restrictions=reject_unauth_pipelining and smtpd_discard_ehlo_keywords=chunking (or certain other options that exist in recent versions). Remote attackers can use a published exploitation technique to inject e-mail messages with a spoofed MAIL FROM address, allowing bypass of an SPF protection mechanism. This occurs because Postfix supports . but some other popular e-mail servers do not. To prevent attack variants (by always disallowing without ), a different solution is required, such as the smtpd_forbid_bare_newline=yes option with a Postfix minimum version of 3.5.23, 3.6.13, 3.7.9, 3.8.4, or 3.9.", "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" } ], "product_status": { "fixed": [ "Oracle-Linux-7:postfix-2:2.10.1-9.el7.tuxcare.els1.x86_64", "Oracle-Linux-7:postfix-perl-scripts-2:2.10.1-9.el7.tuxcare.els1.x86_64", "Oracle-Linux-7:postfix-sysvinit-2:2.10.1-9.el7.tuxcare.els1.noarch" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2023-51764" }, { "category": "external", "summary": "http://www.openwall.com/lists/oss-security/2023/12/24/1", "url": "http://www.openwall.com/lists/oss-security/2023/12/24/1" }, { "category": "external", "summary": "http://www.openwall.com/lists/oss-security/2023/12/25/1", "url": "http://www.openwall.com/lists/oss-security/2023/12/25/1" }, { "category": "external", "summary": "http://www.openwall.com/lists/oss-security/2024/05/09/3", "url": "http://www.openwall.com/lists/oss-security/2024/05/09/3" }, { "category": "external", "summary": "https://access.redhat.com/security/cve/CVE-2023-51764", "url": "https://access.redhat.com/security/cve/CVE-2023-51764" }, { "category": "external", "summary": "https://bugzilla.redhat.com/show_bug.cgi?id=2255563", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2255563" }, { "category": "external", "summary": "https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html", "url": "https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html" }, { "category": "external", "summary": "https://github.com/duy-31/CVE-2023-51764", "url": "https://github.com/duy-31/CVE-2023-51764" }, { "category": "external", "summary": "https://github.com/eeenvik1/CVE-2023-51764", "url": "https://github.com/eeenvik1/CVE-2023-51764" }, { "category": "external", "summary": "https://lists.debian.org/debian-lts-announce/2024/01/msg00020.html", "url": "https://lists.debian.org/debian-lts-announce/2024/01/msg00020.html" }, { "category": "external", "summary": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JQ5WXFCW2N6G2PH3JXDTYW5PH5EBQEGO/", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JQ5WXFCW2N6G2PH3JXDTYW5PH5EBQEGO/" }, { "category": "external", "summary": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QRLF5SOS7TP5N7FQSEK2NFNB44ISVTZC/", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QRLF5SOS7TP5N7FQSEK2NFNB44ISVTZC/" }, { "category": "external", "summary": "https://lwn.net/Articles/956533/", "url": "https://lwn.net/Articles/956533/" }, { "category": "external", "summary": "https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/", "url": "https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/" }, { "category": "external", "summary": "https://www.openwall.com/lists/oss-security/2024/01/22/1", "url": "https://www.openwall.com/lists/oss-security/2024/01/22/1" }, { "category": "external", "summary": "https://www.postfix.org/announcements/postfix-3.8.5.html", "url": "https://www.postfix.org/announcements/postfix-3.8.5.html" }, { "category": "external", "summary": "https://www.postfix.org/smtp-smuggling.html", "url": "https://www.postfix.org/smtp-smuggling.html" }, { "category": "external", "summary": "https://www.youtube.com/watch?v=V8KPV96g1To", "url": "https://www.youtube.com/watch?v=V8KPV96g1To" }, { "category": "external", "summary": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JQ5WXFCW2N6G2PH3JXDTYW5PH5EBQEGO/", "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JQ5WXFCW2N6G2PH3JXDTYW5PH5EBQEGO/" }, { "category": "external", "summary": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QRLF5SOS7TP5N7FQSEK2NFNB44ISVTZC/", "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QRLF5SOS7TP5N7FQSEK2NFNB44ISVTZC/" } ], "release_date": "2023-12-24T05:15:00Z", "remediations": [ { "category": "vendor_fix", "date": "2026-05-15T08:48:59.389538Z", "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1778834936", "product_ids": [ "Oracle-Linux-7:postfix-2:2.10.1-9.el7.tuxcare.els1.x86_64", "Oracle-Linux-7:postfix-perl-scripts-2:2.10.1-9.el7.tuxcare.els1.x86_64", "Oracle-Linux-7:postfix-sysvinit-2:2.10.1-9.el7.tuxcare.els1.noarch" ], "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1778834936" } ], "scores": [ { "cvss_v3": { "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N", "version": "3.1" }, "products": [ "Oracle-Linux-7:postfix-2:2.10.1-9.el7.tuxcare.els1.x86_64", "Oracle-Linux-7:postfix-perl-scripts-2:2.10.1-9.el7.tuxcare.els1.x86_64", "Oracle-Linux-7:postfix-sysvinit-2:2.10.1-9.el7.tuxcare.els1.noarch" ] } ], "threats": [ { "category": "impact", "details": "Moderate" } ] } ] }