A network-manager-ssh security update has been released for both Debian GNU/Linux 9 and 10 to fix a privilege escalation vulnerability.

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Debian Security Advisory DSA-4637-1 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
March 09, 2020   https://www.debian.org/security/faq
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Package : network-manager-ssh
CVE ID : CVE-2020-9355

Kobus van Schoor discovered that network-manager-ssh, a plugin to
provide VPN integration for SSH in NetworkManager, is prone to a
privilege escalation vulnerability. A local user with privileges to
modify a connection can take advantage of this flaw to execute arbitrary
commands as root.

This update drops support to pass extra SSH options to the ssh
invocation.

For the oldstable distribution (stretch), this problem has been fixed
in version 1.2.1-1+deb9u1.

For the stable distribution (buster), this problem has been fixed in
version 1.2.10-1+deb10u1.

We recommend that you upgrade your network-manager-ssh packages.

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

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