A proftpd-dfsg regression update has been released for Debian GNU/Linux 8 LTS to address an issue introduced by the previous update.

Package : proftpd-dfsg
Version : 1.3.5e+r1.3.5-2+deb8u7
CVE ID : CVE-2020-9273

It was discovered that there was a regression in a previous fix for a
use-after-free vulnerability in the proftpd-dfsg FTP server.

Exploitation of the original vulnerability within the memory pool handling
could have allowed a remote attacker to execute arbitrary code on the
affected system. However, the fix that was released in proftpd-dfsg
version 1.3.5e+r1.3.5-2+deb8u6 had a regression around the handling
of log formatting.

For more information, please see:

  https://github.com/proftpd/proftpd/issues/903

For Debian 8 "Jessie", this issue has been fixed in proftpd-dfsg version
1.3.5e+r1.3.5-2+deb8u7.

We recommend that you upgrade your proftpd-dfsg packages.

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://wiki.debian.org/LTS