5.3

CVE-2023-51764

Exploit

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.

Data is provided by the National Vulnerability Database (NVD)
Postfix ≫ Postfix Version < 3.5.23
Postfix ≫ Postfix Version >= 3.6.0 < 3.6.13
Postfix ≫ Postfix Version >= 3.7.0 < 3.7.9
Postfix ≫ Postfix Version >= 3.8.0 < 3.8.4
Fedoraproject ≫ Fedora Version38
Fedoraproject ≫ Fedora Version39
Redhat ≫ Enterprise Linux Version8.0
Redhat ≫ Enterprise Linux Version9.0
Zu dieser CVE wurde keine CISA KEV oder CERT.AT-Warnung gefunden.
EPSS Metriken
Type Source Score Percentile
EPSS FIRST.org 23.08% 0.958
CVSS Metriken
Source Base Score Exploit Score Impact Score Vector string
nvd@nist.gov 5.3 3.9 1.4
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
CWE-345 Insufficient Verification of Data Authenticity

The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data.

https://bugzilla.redhat.com/show_bug.cgi?id=2255563
Third Party Advisory
Issue Tracking
https://github.com/duy-31/CVE-2023-51764
Third Party Advisory
Exploit
https://github.com/eeenvik1/CVE-2023-51764
Third Party Advisory
Exploit
https://www.postfix.org/smtp-smuggling.html
Vendor Advisory
Exploit
Mitigation