CVE-2024-27938

5.3 · MEDIUM

Published Mar 11, 2024 postalserver CWE-116 EPSS 0.66% (49th pctl) CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Overview

CVE-2024-27938 is a medium-severity vulnerability affecting postalserver postal. 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 and patches from postalserver. Update postal to the latest patched version. 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.

Affected Products

Vendor	Product	Versions	Status
postalserver	postal	>= 0, < 3.0.0	Affected

References

GitHub github.com/postalserver/postal/commit/0140dc4 GitHub github.com/postalserver/postal/security/advisories/GHSA-j42r-6c99-hqf2 Ref sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide Ref www.postfix.org/smtp-smuggling.html GitHub github.com/postalserver/postal/commit/0140dc4 GitHub github.com/postalserver/postal/security/advisories/GHSA-j42r-6c99-hqf2 Ref sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide Ref www.postfix.org/smtp-smuggling.html

Frequently Asked Questions

What is CVE-2024-27938?

CVE-2024-27938 is a medium-severity vulnerability affecting postalserver postal. 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?

How can CyberStrike help with CVE-2024-27938?

CyberStrike's AI-powered security agents can automatically detect CVE-2024-27938 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.

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