CVE-2024-27305 SMTP smuggling in aiosmtpd
Attackers can spoof sender addresses in inbound emails via SMTP smuggling, enabling phishing attacks against aiosmtpd users.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-27305?
CVE-2024-27305 is a medium-severity vulnerability in aio-libs aiosmtpd, published on 12 Mar 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
aiosmtpd is a reimplementation of the Python stdlib smtpd.py based on asyncio. aiosmtpd is vulnerable to inbound SMTP smuggling. SMTP smuggling is a novel vulnerability based on not so novel interpretation differences of the SMTP protocol. By exploiting SMTP smuggling, an attacker may send smuggle/spoof e-mails with fake sender addresses, allowing advanced phishing attacks. This issue is also existed in other SMTP software like Postfix. With the right SMTP server constellation, an attacker can send spoofed e-mails to inbound/receiving aiosmtpd instances. This issue has been addressed in version 1.4.5. Users are advised to upgrade. There are no known workarounds for this vulnerability.
Weakness: CWE-345
Which versions are affected by CVE-2024-27305?
3 open source packages ship an affected version, including aiosmtpd. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
aiosmtpd PyPI | All versions | 1.4.5 |
aiosmtpd PyPI | All versions | 1.4.5 |
aiosmtpd PyPI | All versions | 1.4.5 |
Products include Aio-Libs Aiosmtpd.
How do I fix CVE-2024-27305?
Upgrade aiosmtpd to 1.4.5 or later.
Is CVE-2024-27305 being exploited?
There is no known exploitation of CVE-2024-27305 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2024-27305, GHSA-pr2m-px7j-xg65, OESA-2024-1276, OESA-2024-1320, OESA-2024-1321, OESA-2024-1322 and 3 more.