A Security researcher has found a vulnerability in Ubuntu 18.04 Debian-LAN.
Debian-LAN could be made to change Kerberos user passwords on run program as an root privileges.
Wolfgang Schweer discovered that Debian-LAN did not properly handle ACLs
for the Kerberos admin server. A local attacker could possibly use this
issue to change the passwords of other users, leading to root privilege
escalation. (CVE-2019-3467)
The problem can be corrected by updating your system to the following package versions:
debian-lan-config – 0.23+deb9u1build0.18.04.1
In general, a standard system update will make all the necessary changes.