samba - security update

Several vulnerabilities have been discovered in Samba, a SMB/CIFS file,
print, and login server for Unix. The Common Vulnerabilities and
Exposures project identifies the following issues:

• CVE-2015-7560
  Jeremy Allison of Google, Inc. and the Samba Team discovered that
  Samba incorrectly handles getting and setting ACLs on a symlink
  path. An authenticated malicious client can use SMB1 UNIX extensions
  to create a symlink to a file or directory, and then use non-UNIX
  SMB1 calls to overwrite the contents of the ACL on the file or
  directory linked to.
• CVE-2016-0771
  Garming Sam and Douglas Bagnall of Catalyst IT discovered that Samba
  is vulnerable to an out-of-bounds read issue during DNS TXT record
  handling, if Samba is deployed as an AD DC and chosen to run the
  internal DNS server. A remote attacker can exploit this flaw to
  cause a denial of service (Samba crash), or potentially, to allow
  leakage of memory from the server in the form of a DNS TXT reply.

Additionally this update includes a fix for a regression introduced due
to the upstream fix for CVE-2015-5252 in DSA-3433-1 in setups where the
share path is ‘/’.

For the oldstable distribution (wheezy), these problems have been fixed
in version 2:3.6.6-6+deb7u7. The oldstable distribution (wheezy) is not
affected by CVE-2016-0771.

For the stable distribution (jessie), these problems have been fixed in
version 2:4.1.17+dfsg-2+deb8u2.

For the unstable distribution (sid), these problems have been fixed in
version 2:4.3.6+dfsg-1.

We recommend that you upgrade your samba packages.