A debian-lan-config security update has been released for both Debian GNU/Linux 9 and 10. It was discovered that debian-lan-config, a FAI config space for the Debian-LAN system, configured too permissive ACLs for the Kerberos admin server, which allowed password changes for other user principals.

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Debian Security Advisory DSA-4595-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
December 27, 2019   https://www.debian.org/security/faq
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Package : debian-lan-config
CVE ID : CVE-2019-3467
Debian Bug : 947459

It was discovered that debian-lan-config, a FAI config space for the
Debian-LAN system, configured too permissive ACLs for the Kerberos admin
server, which allowed password changes for other user principals.

This update provides a fixed configuration for new deployments, for
existing setups, the NEWS file shipped in this update provides advice
to fix the configuration.

For the oldstable distribution (stretch), this problem has been fixed
in version 0.23+deb9u1.

For the stable distribution (buster), this problem has been fixed in
version 0.25+deb10u1.

We recommend that you upgrade your debian-lan-config packages.

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

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/