CVE-2023-51764

תיאור (מקור, אנגלית)

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.

מדדים

CVSS 3.1

5.3 (MEDIUM) מקור הציון: NVD CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

EPSS — סבירות ניצול

3% (אחוזון 100) נכון ל-14/10/2026

CWE

CWE-345

מוצרים מושפעים

postfix: postfix; fedoraproject: fedora; redhat: enterprise linux

קישורים

• https://www.postfix.org/smtp-smuggling.html ExploitMitigationVendor Advisory
• https://www.postfix.org/smtp-smuggling.html ExploitMitigationVendor Advisory
• https://github.com/duy-31/CVE-2023-51764 ExploitThird Party Advisory
• https://github.com/eeenvik1/CVE-2023-51764 ExploitThird Party Advisory
• https://www.youtube.com/watch?v=V8KPV96g1To Exploit
• https://github.com/duy-31/CVE-2023-51764 ExploitThird Party Advisory
• https://github.com/eeenvik1/CVE-2023-51764 ExploitThird Party Advisory
• https://www.youtube.com/watch?v=V8KPV96g1To Exploit
• http://www.openwall.com/lists/oss-security/2023/12/24/1 Mailing ListThird Party Advisory
• http://www.openwall.com/lists/oss-security/2023/12/25/1 Mailing ListThird Party Advisory