AZL-7346 CVE-2018-1057 affecting package samba for versions less than 4.12.5-6

On a Samba 4 AD DC the LDAP server in all versions of Samba from 4.0.0 onwards incorrectly validates permissions to modify passwords over LDAP allowing authenticated users to change any other users' passwords, including administrative users and privileged service accounts eg Domain Controllers...