A proftpd-dfsg security update has been released for Debian GNU/Linux 9 LTS to address several memory leaks.

DLA 2338-1: proftpd-dfsg security update

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Debian LTS Advisory DLA-2338-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Markus Koschany
August 22, 2020   https://wiki.debian.org/LTS
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Package : proftpd-dfsg
Version : 1.3.5e+r1.3.5b-4+deb9u1
CVE ID : not available
Debian Bug : 923926

Several memory leaks were discovered in proftpd-dfsg, a versatile,
virtual-hosting FTP daemon, when mod_facl or mod_sftp
is used which could lead to memory exhaustion and a denial-of-service.

The update also makes automatic upgrades of proftpd-dfsg from Debian 8
to Debian 9 possible again.

For Debian 9 stretch, this problem has been fixed in version
1.3.5e+r1.3.5b-4+deb9u1.

We recommend that you upgrade your proftpd-dfsg packages.

For the detailed security status of proftpd-dfsg please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/proftpd-dfsg

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