A vsftpd security update has been released for Ubuntu Linux 20.04 LTS.

[USN-6379-1] vsftpd vulnerability

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Ubuntu Security Notice USN-6379-1
September 18, 2023

vsftpd vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS

Summary:

vsftpd could allow unintended access to network services.

Software Description:
- vsftpd: FTP server written for security

Details:

It was discovered that vsftpd was vulnerable to the ALPACA TLS protocol
content confusion attack. A remote attacker could possibly use this issue
to redirect traffic from one subdomain to another.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 20.04 LTS:
vsftpd 3.0.5-0ubuntu0.20.04.1

This update uses a new upstream release, which includes additional bug
fixes. In general, a standard system update will make all the necessary
changes.

References:
https://ubuntu.com/security/notices/USN-6379-1
CVE-2021-3618

Package Information:
https://launchpad.net/ubuntu/+source/vsftpd/3.0.5-0ubuntu0.20.04.1