The bundled LDAP client library in Samba 3.x and 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 "client ldap sasl wrapping" setting, which allows man-in-the-middle attackers to perform LDAP protocol-downgrade attacks by modifying the client-server data stream.
https://www.samba.org/samba/security/CVE-2016-2112.html
https://www.samba.org/samba/latest_news.html#4.4.2
https://www.samba.org/samba/history/samba-4.2.10.html
https://security.gentoo.org/glsa/201612-47
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05162399
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05082964
https://h20566.www2.hpe.com/hpsc/doc/public/display?docId=emr_na-c05087821
https://bto.bluecoat.com/security-advisory/sa122
http://www.ubuntu.com/usn/USN-2950-5
http://www.ubuntu.com/usn/USN-2950-4
http://www.ubuntu.com/usn/USN-2950-3
http://www.ubuntu.com/usn/USN-2950-2
http://www.ubuntu.com/usn/USN-2950-1
http://www.slackware.com/security/viewer.php?l=slackware-security&y=2016&m=slackware-security.458012
http://www.securitytracker.com/id/1035533
http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
http://www.debian.org/security/2016/dsa-3548
http://rhn.redhat.com/errata/RHSA-2016-0624.html
http://rhn.redhat.com/errata/RHSA-2016-0620.html
http://rhn.redhat.com/errata/RHSA-2016-0619.html
http://rhn.redhat.com/errata/RHSA-2016-0618.html
http://rhn.redhat.com/errata/RHSA-2016-0614.html
http://rhn.redhat.com/errata/RHSA-2016-0613.html
http://rhn.redhat.com/errata/RHSA-2016-0612.html
http://rhn.redhat.com/errata/RHSA-2016-0611.html
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/2016-04/msg00024.html
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00023.html
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00022.html
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00021.html
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00020.html
http://lists.fedoraproject.org/pipermail/package-announce/2016-April/182288.html
http://lists.fedoraproject.org/pipermail/package-announce/2016-April/182272.html
http://lists.fedoraproject.org/pipermail/package-announce/2016-April/182185.html