Red Hat: CVE-2023-51764: postfix: SMTP smuggling vulnerability (Multiple Advisories)
Description
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.
Solution(s)
- redhat-upgrade-postfix
- redhat-upgrade-postfix-cdb
- redhat-upgrade-postfix-cdb-debuginfo
- redhat-upgrade-postfix-debuginfo
- redhat-upgrade-postfix-debugsource
- redhat-upgrade-postfix-ldap
- redhat-upgrade-postfix-ldap-debuginfo
- redhat-upgrade-postfix-lmdb
- redhat-upgrade-postfix-lmdb-debuginfo
- redhat-upgrade-postfix-mysql
- redhat-upgrade-postfix-mysql-debuginfo
- redhat-upgrade-postfix-pcre
- redhat-upgrade-postfix-pcre-debuginfo
- redhat-upgrade-postfix-perl-scripts
- redhat-upgrade-postfix-pgsql
- redhat-upgrade-postfix-pgsql-debuginfo
- redhat-upgrade-postfix-sqlite
- redhat-upgrade-postfix-sqlite-debuginfo
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