A Pure-FTPd security update has been released for Ubuntu Linux 16.04 LTS.

USN-4515-1: Pure-FTPd vulnerability

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Ubuntu Security Notice USN-4515-1
September 17, 2020

pure-ftpd vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 16.04 LTS

Summary:

Pure-FTPd could be made to expose sensitive information if it recieved
specially crafted input.

Software Description:
- pure-ftpd: Secure and efficient FTP server

Details:

Antonio Norales discovered that Pure-FTPd incorrectly handled directory
aliases. An attacker could possibly use this issue to access sensitive
information. (CVE-2020-9274)

Update instructions:

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

Ubuntu 16.04 LTS:
pure-ftpd 1.0.36-3.2+deb8u1build0.16.04.1
pure-ftpd-common 1.0.36-3.2+deb8u1build0.16.04.1
pure-ftpd-ldap 1.0.36-3.2+deb8u1build0.16.04.1
pure-ftpd-mysql 1.0.36-3.2+deb8u1build0.16.04.1
pure-ftpd-postgresql 1.0.36-3.2+deb8u1build0.16.04.1

In general, a standard system update will make all the necessary changes.

References:
  https://usn.ubuntu.com/4515-1
CVE-2020-9274

Package Information:
  https://launchpad.net/ubuntu/+source/pure-ftpd/1.0.36-3.2+deb8u1build0.16.04.1