CVE-2023-51764

CVSS 3.1 Score 5.3 of 10 (medium)

Details

Published Dec 24, 2023
Updated: Jun 10, 2024
CWE ID 345

Summary

CVE-2023-51764 is a vulnerability affecting Postfix email servers up to version 3.8.5. It enables SMTP smuggling, allowing remote attackers to inject e-mail messages with spoofed MAIL FROM addresses, bypassing SPF protection mechanisms. This occurs due to Postfix's support for <LF>.<CR><LF>, which some other popular e-mail servers do not. To mitigate this issue, administrators should configure smtpd_data_restrictions=reject_unauth_pipelining and smtpd_discard_ehlo_keywords=chunking, or enable smtpd_forbid_bare_newline=yes with a Postfix minimum version of 3.5.23, 3.6.13, 3.7.9, 3.8.4, or 3.9.

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Affected Products

  • Postfix
  • Red Hat Enterprise Linux
  • Fedora Operating System

Affected Vendors

  • Postfix
  • Red Hat
  • Fedora Project

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