A flaw was found in the way samba implemented an RPC endpoint emulating the Windows registry service API. An unprivileged attacker could use this flaw to create a new registry hive file anywhere they have unix permissions which could lead to creation of a new file in the Samba share. Versions before 4.8.11, 4.9.6 and 4.10.2 are vulnerable.
https://www.synology.com/security/advisory/Synology_SA_19_15
https://www.samba.org/samba/security/CVE-2019-3880.html
https://support.f5.com/csp/article/K20804356
https://security.netapp.com/advisory/ntap-20190411-0004/
https://lists.debian.org/debian-lts-announce/2019/04/msg00013.html
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3880
https://access.redhat.com/security/cve/cve-2019-3880
https://access.redhat.com/errata/RHSA-2019:3582
https://access.redhat.com/errata/RHSA-2019:2099
https://access.redhat.com/errata/RHSA-2019:1967
https://access.redhat.com/errata/RHSA-2019:1966
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00106.html
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00050.html