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.
2023-12-24T05:15:08.273
2024-11-21T08:38:44.733
Modified
CVSSv3.1: 5.3 (MEDIUM)
Type | Vendor | Product | Version/Range | Vulnerable? |
---|---|---|---|---|
Application | postfix | postfix | < 3.5.23 | Yes |
Application | postfix | postfix | < 3.6.13 | Yes |
Application | postfix | postfix | < 3.7.9 | Yes |
Application | postfix | postfix | < 3.8.4 | Yes |
Operating System | fedoraproject | fedora | 38 | Yes |
Operating System | fedoraproject | fedora | 39 | Yes |
Operating System | redhat | enterprise_linux | 8.0 | Yes |
Operating System | redhat | enterprise_linux | 9.0 | Yes |