Attention: A new vulnerability has been identified in Postfix (CVE-2023-51764), which may compromise your email server’s security if not addressed!
To all system administrators and IT professionals using Postfix for handling emails, an urgent update is necessary due to a recent security disclosure. Postfix, a widely-used open-source mail transfer agent that helps in routing and delivering electronic mail, is currently at risk of SMTP smuggling if not configured with certain settings.
The CVE identified (CVE-2023-51764) has a medium severity score of 5.3. It exposes a security loophole in versions up to 3.8.5, which can allow attackers to inject spoofed email messages that bypass SPF protection mechanisms. SPF, or Sender Policy Framework, is a path verification system that prevents spam by detecting email spoofing.
The vulnerability manipulates how line terminations are handled, specifically instances of line-feeds (
To secure your systems against this vulnerability, it is recommended to update to at least one of these Postfix versions: 3.5.23, 3.6.13, 3.7.9, 3.8.4, or 3.9. Additionally, configuring your Postfix server with the setting `smtpd_data_restrictions=reject_unauth_pipelining` and `smtpd_discard_ehlo_keywords=chunking` will further restrain unauthorized email injections.
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