Samba is "an Open Source/Free Software suite that has, since 1992, provided file and print services to all manner of SMB/CIFS clients, including the numerous versions of Microsoft Windows operating systems. Samba is freely available under the GNU General Public License". Secunia Research has discovered a vulnerability in Samba, which can be exploited by malicious people to compromise a vulnerable system.

http://www.securiteam.com/unixfocus/6P00F0AKKY.html