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).
https://www.synology.com/support/security/Synology_SA_18_08
https://www.samba.org/samba/security/CVE-2018-1057.html
https://www.debian.org/security/2018/dsa-4135
https://usn.ubuntu.com/3595-1/
https://security.netapp.com/advisory/ntap-20180313-0001/
https://security.gentoo.org/glsa/201805-07
https://lists.debian.org/debian-lts-announce/2019/04/msg00013.html
https://bugzilla.redhat.com/show_bug.cgi?id=1553553