Debian LTS: DLA-2339-1: software-properties security update
Summary
For Debian 9 stretch, this problem has been fixed in version
0.96.20.2-1+deb9u1.
We recommend that you upgrade your software-properties packages.
For the detailed security status of software-properties please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/software-properties
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