CVE-2023-51764
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.
Severity: MEDIUM
CVE ID: CVE-2023-51764
CVSS Score: 5.3
CVSS Metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Proof Of Concept
duy-31
Postfix SMTP Smuggling - Expect Script POC
Refrence: GitHub
eeenvik1
PoC CVE-2023-51764
Refrence: GitHub
d4op
just idea, no cp pls
Refrence: GitHub
Double-q1015
CVE-2023-51764 poc
Refrence: GitHub