Vulnerability found and corrected in Samba File Services
Samba file service does not performs ACL checks against stream files while performing generic file operations like read and write. This could allow a remote attacker to bypass file restrictions by leveraging ACL differences between a file and an associated alternate data stream.
Read more here - http://www.samba.org/samba/security/CVE-2013-4475
Patches addressing this issue can be found here - http://www.samba.org/samba/security/