CVE-2023-51764

01/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.

02/מוצרים מושפעים

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

03/קישורים10

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