CVE-2024-27938 SMTP Smuggling in Postal
Attackers can spoof incoming emails via SMTP smuggling, bypassing sender authorization checks in Postal mail server.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2024-27938?
CVE-2024-27938 is a medium-severity vulnerability in postalserver postal, published on 11 Mar 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-116
Which versions are affected by CVE-2024-27938?
It affects 1 product.
Products include Postalserver Postal.
How do I fix CVE-2024-27938?
No fix has been published for CVE-2024-27938 yet. Limit exposure of the affected software until one is available.
Is CVE-2024-27938 being exploited?
There is no known exploitation of CVE-2024-27938 in the wild and no public exploit code.
Other vulnerabilities in postalserver postal
Sources
Also known as GHSA-j42r-6c99-hqf2.