A ldm security update has been released for both Debian GNU/Linux 9 and 10

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Debian Security Advisory DSA-4601-1 security@debian.org
https://www.debian.org/security/ Moritz Muehlenhoff
January 09, 2020 https://www.debian.org/security/faq
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Package : ldm
CVE ID : not yet available

It was discovered that a hook script of ldm, the display manager for the
Linux Terminal Server Project incorrectly parsed responses from an SSH
server which could result in local root privilege escalation.

For the oldstable distribution (stretch), this problem has been fixed
in version 2:2.2.18-2+deb9u1.

For the stable distribution (buster), this problem has been fixed in
version 2:2.18.06-1+deb10u1.

We recommend that you upgrade your ldm packages.

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

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/