MitM attack in aiosmtpd

1) Acceptance of Extraneous Untrusted Data With Trusted Data

EUVDB-ID: #VU91603

Risk: Medium

CVSSv4.0: [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2024-34083

CWE-ID: CWE-349 - Acceptance of Extraneous Untrusted Data With Trusted Data

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform MitM attack.

The vulnerability exists due to aiosmtpd accept extra unencrypted commands after STARTTLS, treating them as if they came from inside the encrypted connection. A remote attacker can perform MitM attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

aiosmtpd: 1.0 - 1.4.5

CPE2.3

• cpe:2.3:a:aio-libs:aiosmtpd:1.0:*:*:*:*:*:*:*
• cpe:2.3:a:aio-libs:aiosmtpd:1.1:*:*:*:*:*:*:*
• cpe:2.3:a:aio-libs:aiosmtpd:1.2:*:*:*:*:*:*:*

External links

http://github.com/aio-libs/aiosmtpd/security/advisories/GHSA-wgjv-9j3q-jhg8
http://github.com/aio-libs/aiosmtpd/commit/b3a4a2c6ecfd228856a20d637dc383541fcdbfda

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.