CVE-2023-51764 SUSE CVE security@suse.de SUSE Security Team SUSE CVE-2023-51764 Interim 1 33 2026-03-05T03:32:07Z current 2023-12-25T00:08:46Z 2026-03-05T03:32:07Z cve-database/bin/generate-cvrf-cve.pl 2020-12-27T01:00:00Z CVE-2023-51764 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 <LF>.<CR><LF> but some other popular e-mail servers do not. To prevent attack variants (by always disallowing <LF> without <CR>), 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. The CVRF data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0). https://lists.suse.com/pipermail/suse-liberty-linux-updates/2024-November/000586.html E-Mail link for RHSA-2024:9243 https://lists.suse.com/pipermail/sle-security-updates/2023-December/017566.html E-Mail link for SUSE-SU-2023:4981-1 https://lists.suse.com/pipermail/sle-security-updates/2024-January/017584.html E-Mail link for SUSE-SU-2024:0012-1 https://lists.suse.com/pipermail/sle-updates/2024-April/034873.html E-Mail link for SUSE-SU-2024:1149-1 https://www.suse.com/support/kb/doc/?id=000021307 E-Mail link for TID000021307 https://www.suse.com/support/security/rating/ SUSE Security Ratings Image SLES15-SP4-Manager-Server-4-3 Image SLES15-SP4-Manager-Server-4-3-Azure-llc Image SLES15-SP4-Manager-Server-4-3-Azure-ltd Image SLES15-SP4-Manager-Server-4-3-BYOS Image SLES15-SP4-Manager-Server-4-3-BYOS-Azure Image SLES15-SP4-Manager-Server-4-3-BYOS-EC2 Image SLES15-SP4-Manager-Server-4-3-BYOS-GCE Image SLES15-SP4-Manager-Server-4-3-EC2-llc Image SLES15-SP4-Manager-Server-4-3-EC2-ltd SUSE Enterprise Storage 7.1 SUSE Liberty Linux 9 SUSE Linux Enterprise Module for Basesystem 15 SP4 SUSE Linux Enterprise Module for Basesystem 15 SP5 SUSE Linux Enterprise Module for Basesystem 15 SP6 SUSE Linux Enterprise Module for Basesystem 15 SP7 SUSE Linux Enterprise High Performance Computing 15 SP3-ESPOS SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS SUSE Linux Enterprise Module for Basesystem 15 SP4 SUSE Linux Enterprise Module for Legacy 15 SP4 SUSE Linux Enterprise Module for Server Applications 15 SP4 SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS SUSE Linux Enterprise Module for Basesystem 15 SP5 SUSE Linux Enterprise Module for Legacy 15 SP5 SUSE Linux Enterprise Module for Server Applications 15 SP5 SUSE Linux Enterprise Module for Basesystem 15 SP6 SUSE Linux Enterprise Module for Legacy 15 SP6 SUSE Linux Enterprise Module for Server Applications 15 SP6 SUSE Linux Enterprise Module for Basesystem 15 SP7 SUSE Linux Enterprise Module for Legacy 15 SP7 SUSE Linux Enterprise Module for Server Applications 15 SP7 SUSE Linux Enterprise Real Time 15 SP3 SUSE Linux Enterprise Real Time 15 SP4 SUSE Linux Enterprise Server 11 SP4 LTSS SUSE Linux Enterprise Server 12 SP3-TERADATA SUSE Linux Enterprise Server 12 SP5 SUSE Linux Enterprise Software Development Kit 12 SP5 SUSE Linux Enterprise Server 15 SP3-LTSS SUSE Linux Enterprise Module for Basesystem 15 SP4 SUSE Linux Enterprise Module for Legacy 15 SP4 SUSE Linux Enterprise Module for Server Applications 15 SP4 SUSE Linux Enterprise Server 15 SP4-LTSS SUSE Linux Enterprise Server 15 SP4-TERADATA SUSE Linux Enterprise Module for Basesystem 15 SP5 SUSE Linux Enterprise Module for Legacy 15 SP5 SUSE Linux Enterprise Module for Server Applications 15 SP5 SUSE Linux Enterprise Module for Basesystem 15 SP6 SUSE Linux Enterprise Module for Legacy 15 SP6 SUSE Linux Enterprise Module for Server Applications 15 SP6 SUSE Linux Enterprise Module for Basesystem 15 SP7 SUSE Linux Enterprise Module for Legacy 15 SP7 SUSE Linux Enterprise Module for Server Applications 15 SP7 SUSE Linux Enterprise Server 16.0 SUSE Linux Enterprise Server for SAP Applications 12 SP5 SUSE Linux Enterprise Software Development Kit 12 SP5 SUSE Linux Enterprise Server for SAP Applications 15 SP3 SUSE Linux Enterprise Module for Basesystem 15 SP4 SUSE Linux Enterprise Module for Legacy 15 SP4 SUSE Linux Enterprise Module for Server Applications 15 SP4 SUSE Linux Enterprise Server for SAP Applications 15 SP4 SUSE Linux Enterprise Module for Basesystem 15 SP5 SUSE Linux Enterprise Module for Legacy 15 SP5 SUSE Linux Enterprise Module for Server Applications 15 SP5 SUSE Linux Enterprise Module for Basesystem 15 SP6 SUSE Linux Enterprise Module for Legacy 15 SP6 SUSE Linux Enterprise Module for Server Applications 15 SP6 SUSE Linux Enterprise Module for Basesystem 15 SP7 SUSE Linux Enterprise Module for Legacy 15 SP7 SUSE Linux Enterprise Module for Server Applications 15 SP7 SUSE Manager Proxy 4.2 SUSE Linux Enterprise Module for Basesystem 15 SP4 SUSE Linux Enterprise Module for Legacy 15 SP4 SUSE Linux Enterprise Module for Server Applications 15 SP4 SUSE Manager Proxy 4.3 SUSE Manager Retail Branch Server 4.2 SUSE Linux Enterprise Module for Basesystem 15 SP4 SUSE Linux Enterprise Module for Legacy 15 SP4 SUSE Linux Enterprise Module for Server Applications 15 SP4 SUSE Manager Retail Branch Server 4.3 SUSE Manager Server 4.2 SUSE Linux Enterprise Module for Basesystem 15 SP4 SUSE Linux Enterprise Module for Legacy 15 SP4 SUSE Linux Enterprise Module for Server Applications 15 SP4 SUSE Manager Server 4.3 openSUSE Leap 15.4 openSUSE Leap 15.5 openSUSE Tumbleweed postfix postfix-3.10.2-160000.2.2 postfix-3.2.10-3.30.1 postfix-3.5.25-1.el9 postfix-3.5.9-150300.5.15.1 postfix-3.7.3-150500.3.11.1 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Linux Enterprise Server for SAP Applications 15 SP4 postfix-devel-3.5.9-150300.5.15.1 as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP4 postfix-doc-3.5.9-150300.5.15.1 as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP4 postfix-ldap-3.5.9-150300.5.15.1 as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP4 postfix-mysql-3.5.9-150300.5.15.1 as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP4 postfix-devel-3.2.10-3.30.1 as a component of SUSE Linux Enterprise Software Development Kit 12 SP5 postfix-3.5.9-150300.5.15.1 as a component of SUSE Manager Proxy 4.3 postfix-devel-3.5.9-150300.5.15.1 as a component of SUSE Manager Proxy 4.3 postfix-doc-3.5.9-150300.5.15.1 as a component of SUSE Manager Proxy 4.3 postfix-ldap-3.5.9-150300.5.15.1 as a component of SUSE Manager Proxy 4.3 postfix-mysql-3.5.9-150300.5.15.1 as a component of SUSE Manager Proxy 4.3 postfix-3.5.9-150300.5.15.1 as a component of 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postfix-devel-3.5.9-150300.5.15.1 as a component of openSUSE Leap 15.4 postfix-doc-3.5.9-150300.5.15.1 as a component of openSUSE Leap 15.4 postfix-ldap-3.5.9-150300.5.15.1 as a component of openSUSE Leap 15.4 postfix-mysql-3.5.9-150300.5.15.1 as a component of openSUSE Leap 15.4 postfix-postgresql-3.5.9-150300.5.15.1 as a component of openSUSE Leap 15.4 postfix-3.7.3-150500.3.11.1 as a component of openSUSE Leap 15.5 postfix-bdb-3.7.3-150500.3.11.1 as a component of openSUSE Leap 15.5 postfix-bdb-lmdb-3.7.3-150500.3.11.1 as a component of openSUSE Leap 15.5 postfix-devel-3.7.3-150500.3.11.1 as a component of openSUSE Leap 15.5 postfix-doc-3.7.3-150500.3.11.1 as a component of openSUSE Leap 15.5 postfix-ldap-3.7.3-150500.3.11.1 as a component of openSUSE Leap 15.5 postfix-mysql-3.7.3-150500.3.11.1 as a component of openSUSE Leap 15.5 postfix-postgresql-3.7.3-150500.3.11.1 as a component of openSUSE Leap 15.5 postfix-3.8.4-2.1 as a component of openSUSE Tumbleweed postfix-devel-3.8.4-2.1 as a component of openSUSE Tumbleweed postfix-doc-3.8.4-2.1 as a component of openSUSE Tumbleweed postfix-ldap-3.8.4-2.1 as a component of openSUSE Tumbleweed postfix-mysql-3.8.4-2.1 as a component of openSUSE Tumbleweed postfix-postgresql-3.8.4-2.1 as a component of openSUSE Tumbleweed postfix as a component of SUSE Linux Enterprise Module for Basesystem 15 SP6 postfix-devel as a component of SUSE Linux Enterprise Module for Basesystem 15 SP6 postfix-doc as a component of SUSE Linux Enterprise Module for Basesystem 15 SP6 postfix-ldap as a component of SUSE Linux Enterprise Module for Basesystem 15 SP6 postfix as a component of SUSE Linux Enterprise Module for Legacy 15 SP6 postfix-mysql as a component of SUSE Linux Enterprise Module for Server Applications 15 SP6 postfix as a component of SUSE Linux Enterprise Module for Server Applications 15 SP6 postfix as a component of SUSE Linux Enterprise Real Time 15 SP3 postfix-devel as a component of SUSE Linux Enterprise Real Time 15 SP3 postfix-doc as a component of SUSE Linux Enterprise Real Time 15 SP3 postfix-ldap as a component of SUSE Linux Enterprise Real Time 15 SP3 postfix-mysql as a component of SUSE Linux Enterprise Real Time 15 SP3 postfix as a component of SUSE Linux Enterprise Server 11 SP4 LTSS postfix as a component of SUSE Manager Proxy 4.2 postfix-devel as a component of SUSE Manager Proxy 4.2 postfix-doc as a component of SUSE Manager Proxy 4.2 postfix-ldap as a component of SUSE Manager Proxy 4.2 postfix-mysql as a component of SUSE Manager Proxy 4.2 postfix as a component of SUSE Manager Retail Branch Server 4.2 postfix-devel as a component of SUSE Manager Retail Branch Server 4.2 postfix-doc as a component of SUSE Manager Retail Branch Server 4.2 postfix-ldap as a component of SUSE Manager Retail Branch Server 4.2 postfix-mysql as a component of SUSE Manager Retail Branch Server 4.2 postfix as a component of SUSE Manager Server 4.2 postfix-devel as a component of SUSE Manager Server 4.2 postfix-doc as a component of SUSE Manager Server 4.2 postfix-ldap as a component of SUSE Manager Server 4.2 postfix-mysql as a component of SUSE Manager Server 4.2 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 <LF>.<CR><LF> but some other popular e-mail servers do not. To prevent attack variants (by always disallowing <LF> without <CR>), 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. CVE-2023-51764 Image SLES15-SP4-Manager-Server-4-3:postfix-3.5.9-150300.5.15.1 Image SLES15-SP4-Manager-Server-4-3-Azure-llc:postfix-3.5.9-150300.5.15.1 Image SLES15-SP4-Manager-Server-4-3-Azure-ltd:postfix-3.5.9-150300.5.15.1 Image SLES15-SP4-Manager-Server-4-3-BYOS:postfix-3.5.9-150300.5.15.1 Image SLES15-SP4-Manager-Server-4-3-BYOS-Azure:postfix-3.5.9-150300.5.15.1 Image SLES15-SP4-Manager-Server-4-3-BYOS-EC2:postfix-3.5.9-150300.5.15.1 Image SLES15-SP4-Manager-Server-4-3-BYOS-GCE:postfix-3.5.9-150300.5.15.1 Image SLES15-SP4-Manager-Server-4-3-EC2-llc:postfix-3.5.9-150300.5.15.1 Image SLES15-SP4-Manager-Server-4-3-EC2-ltd:postfix-3.5.9-150300.5.15.1 SUSE Enterprise Storage 7.1:postfix-3.5.9-150300.5.15.1 SUSE Enterprise Storage 7.1:postfix-bdb-3.5.9-150300.5.15.1 SUSE Enterprise Storage 7.1:postfix-bdb-lmdb-3.5.9-150300.5.15.1 SUSE Enterprise Storage 7.1:postfix-devel-3.5.9-150300.5.15.1 SUSE Enterprise Storage 7.1:postfix-doc-3.5.9-150300.5.15.1 SUSE Enterprise Storage 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