Inbound SMTP Smuggling Vulnerability Affects aiosmtpd

CVE-2024-27305

What is CVE-2024-27305?

The aiosmtpd library, a Python-based implementation of the standard SMTP server, is subject to a vulnerability involving inbound SMTP smuggling. This flaw allows malicious actors to exploit discrepancies in SMTP protocol interpretations to send fraudulent emails, masquerading as legitimate emails with manipulated sender addresses. Such exploitation enables advanced phishing tactics, posing significant risks to users relying on aiosmtpd for email handling. The vulnerability is similarly present in other SMTP software, including Postfix, and necessitates correct server configurations to mitigate exploitation. This issue is resolved in aiosmtpd version 1.4.5, prompting users to upgrade to safeguard against potential attacks.

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