CVE-2024-27938
"Postal SMTP Smuggling Vulnerability"
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.
INFO
Published Date :
March 11, 2024, 10:15 p.m.
Last Modified :
Nov. 21, 2024, 9:05 a.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
1.4
Exploitability Score :
3.9
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2024-27938.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2024-27938 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2024-27938 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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Initial Analysis by [email protected]
Feb. 26, 2025
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:postalserver:postal:*:*:*:*:*:*:*:* versions from (excluding) 3.0.0 Added Reference Type CVE: https://github.com/postalserver/postal/commit/0140dc4 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/postalserver/postal/commit/0140dc4 Types: Patch Added Reference Type CVE: https://github.com/postalserver/postal/security/advisories/GHSA-j42r-6c99-hqf2 Types: Vendor Advisory Added Reference Type GitHub, Inc.: https://github.com/postalserver/postal/security/advisories/GHSA-j42r-6c99-hqf2 Types: Vendor Advisory Added Reference Type CVE: https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide Types: Technical Description Added Reference Type GitHub, Inc.: https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide Types: Technical Description Added Reference Type CVE: https://www.postfix.org/smtp-smuggling.html Types: Exploit Added Reference Type GitHub, Inc.: https://www.postfix.org/smtp-smuggling.html Types: Exploit -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://github.com/postalserver/postal/commit/0140dc4 Added Reference https://github.com/postalserver/postal/security/advisories/GHSA-j42r-6c99-hqf2 Added Reference https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide Added Reference https://www.postfix.org/smtp-smuggling.html -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
CVE Received by [email protected]
Mar. 11, 2024
Action Type Old Value New Value Added 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. Added Reference GitHub, Inc. https://github.com/postalserver/postal/security/advisories/GHSA-j42r-6c99-hqf2 [No types assigned] Added Reference GitHub, Inc. https://github.com/postalserver/postal/commit/0140dc4 [No types assigned] Added Reference GitHub, Inc. https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide [No types assigned] Added Reference GitHub, Inc. https://www.postfix.org/smtp-smuggling.html [No types assigned] Added CWE GitHub, Inc. CWE-116 Added CVSS V3.1 GitHub, Inc. AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2024-27938 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2024-27938
weaknesses.