samba - security update

Several vulnerabilities were found in Samba, a SMB/CIFS implementation
that provides a file, print, and login server.

• CVE-2015-5252
  Jan Yenya Kasprzak and the Computer Systems Unit team at Faculty
  of Informatics, Masaryk University, reported that samba wrongly
  verified symlinks, making it possible to access resources outside
  the shared path, under certain circumstances.
• CVE-2015-5296
  Stefan Metzmacher of SerNet and the Samba Team discovered that samba
  did not ensure that signing was negotiated when a client established
  an encrypted connection against a samba server.
• CVE-2015-5299
  Samba was vulnerable to a missing access control check in the
  VFS shadow_copy2 module, that could allow unauthorized users to
  access snapshots.

For Debian 6 Squeeze, this issue has been fixed in samba version
2:3.5.6~dfsg-3squeeze13. We recommend you to upgrade your samba
packages.