Samba released several updates to fix some security vulnerabilities. Anyone running Samba should take a look at each of the bulletin below and seriously consider upgrading which can be downloaded here.
 

References:

Information disclosure by setuid mount.cifs - affecting all versions

Remote DoS against smbd on authenticated connections - affecting all versions

Misconfigured /etc/passwd file may share folders unexpectedly - affecting version > 3.0.11

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Guy Bruneau IPSS Inc. gbruneau at isc dot sans dot org