Vulnerability identifier: #VU17765

Vulnerability risk: Low

CVSSv3.1: 5.5 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-8337

CWE-ID: CWE-264

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
msmtp
Server applications / Mail servers

Vendor: Martin Lambers

Description

The vulnerability allows a remote authenticated attacker to bypass security restrictions on the system.

The vulnerability exists due to improper certificate verification when the affected software uses the new system default value for the  tls_trust_file command in its default configuration file. A remote attacker can send an email to an SMTP server and bypass certificate verification and conduct further attacks. 

Mitigation
Update to version 1.8.3.

Vulnerable software versions

msmtp: 1.8.2

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External links
http://marlam.de/msmtp/news/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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