CVE-2024-27938

CVSS 3.1 Score 5.3 of 10 (medium)

Details

Published Mar 11, 2024
Updated: Mar 12, 2024
CWE ID 116

Summary

CVE-2024-27938 is a vulnerability in the Postal SMTP server, specifically affecting versions prior to 3.0.0. This vulnerability allows for SMTP Smuggling attacks, which enable spoofing of incoming emails. By combining this vulnerability with a cooperative outgoing SMTP service, an attacker can send an email that appears to be from a trusted server authorized to send mail on behalf of a user, even though they are not the genuine author of the email. Postal is not impacted when sending outgoing emails as they are re-encoded with `<CR><LF>` line endings during transmission over SMTP. The issue has been addressed in Postal version 3.0.0, and users are advised to upgrade to this version or higher. Upgraded versions of Postal will only accept End of DATA sequences that explicitly use `<CR><LF>.<CR><LF>`. Any non-compliant sequences will be logged to the SMTP server log. No workarounds are available for this vulnerability.

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