The SMB1 implementation in smbd in Samba 3.x and 4.x before 4.1.23, 4.2.x before 4.2.9, 4.3.x before 4.3.6, and 4.4.x before 4.4.0rc4 allows remote authenticated users to modify arbitrary ACLs by using a UNIX SMB1 call to create a symlink, and then using a non-UNIX SMB1 call to write to the ACL content.
https://www.samba.org/samba/security/CVE-2015-7560.html
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05121842
https://bugzilla.samba.org/show_bug.cgi?id=11648
http://www.ubuntu.com/usn/USN-2922-1
http://www.securitytracker.com/id/1035220
http://www.securityfocus.com/bid/84267
http://www.debian.org/security/2016/dsa-3514
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00048.html
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00047.html
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00042.html
http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00092.html
http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00090.html
http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00081.html
http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00065.html
http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00064.html
http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00063.html
http://lists.fedoraproject.org/pipermail/package-announce/2016-March/180000.html
http://lists.fedoraproject.org/pipermail/package-announce/2016-March/178764.html
http://lists.fedoraproject.org/pipermail/package-announce/2016-March/178730.html