CVE-2016-2114
The SMB1 protocol implementation in Samba 4.x before 4.2.11, 4.3.x before 4.3.8, and 4.4.x before 4.4.2 does not recognize the "server signing = mandatory" setting, which allows man-in-the-middle attackers to spoof SMB servers by modifying the client-server data stream.
Date published : 2016-04-24
http://www.securityfocus.com/bid/86011
http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html