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CVE-2024-27938

5.3 · MEDIUM

Postal is an open source SMTP server.

Published Mar 11, 2024CWE-116EPSS 0.66%

Overview

CVE-2024-27938 is a medium-severity vulnerability. It was published on March 11, 2024 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Postal is an open source SMTP server. Postal versions less than 3.0.0 are vulnerable to SMTP Smuggling attacks which may allow incoming e-mails to be spoofed. This, in conjunction with a cooperative outgoing SMTP service, would allow for an incoming e-mail to be received by Postal addressed from a server that a user has 'authorised' to send mail on their behalf but were not the genuine author of the e-mail. Postal is not affected for sending outgoing e-mails as email is re-encoded with `<CR><LF>` line endings when transmitted over SMTP. This issue has been addressed and users should upgrade to Postal v3.0.0 or higher. Once upgraded, Postal will only accept End of DATA sequences which are explicitly `<CR><LF>.<CR><LF>`. If a non-compliant sequence is detected it will be logged to the SMTP server log. There are no workarounds for this issue.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/postalserver/postal/commit/0140dc4GitHubgithub.com/postalserver/postal/security/advisories/GHSA-j42r-6c99-hqf2Refsec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwideRefwww.postfix.org/smtp-smuggling.htmlGitHubgithub.com/postalserver/postal/commit/0140dc4GitHubgithub.com/postalserver/postal/security/advisories/GHSA-j42r-6c99-hqf2Refsec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwideRefwww.postfix.org/smtp-smuggling.html

How CyberStrike helps

Frequently asked questions

What is CVE-2024-27938?

CVE-2024-27938 is a medium-severity vulnerability. It was published on March 11, 2024 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2024-27938?

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2024-27938?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2024-27938?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-27938 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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