[Announce] Samba 4.3.6, 4.2.9, 4.1.23 and 4.4.0rc4 Security Releases Available for Download

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[Announce] Samba 4.3.6, 4.2.9, 4.1.23 and 4.4.0rc4 Security Releases Available for Download

Karolin Seeger-2
Release Announcements
---------------------

This is a security release in order to address the following CVEs:

o  CVE-2015-7560 (Incorrect ACL get/set allowed on symlink path)
o  CVE-2016-0771 (Out-of-bounds read in internal DNS server)

=======
Details
=======

o  CVE-2015-7560:
   All versions of Samba from 3.2.0 to 4.4.0rc3 inclusive are vulnerable to
   a malicious client overwriting the ownership of ACLs using symlinks.

   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.

o  CVE-2016-0771:
   All versions of Samba from 4.0.0 to 4.4.0rc3 inclusive, when deployed as
   an AD DC and choose to run the internal DNS server, are vulnerable to an
   out-of-bounds read issue during DNS TXT record handling caused by users
   with permission to modify DNS records.

   A malicious client can upload a specially constructed DNS TXT record,
   resulting in a remote denial-of-service attack. As long as the affected
   TXT record remains undisturbed in the Samba database, a targeted DNS
   query may continue to trigger this exploit.

   While unlikely, the out-of-bounds read may bypass safety checks and
   allow leakage of memory from the server in the form of a DNS TXT reply.

   By default only authenticated accounts can upload DNS records,
   as "allow dns updates = secure only" is the default.
   Any other value would allow anonymous clients to trigger this
   bug, which is a much higher risk.


#######################################
Reporting bugs & Development Discussion
#######################################

Please discuss this release on the samba-technical mailing list or by
joining the #samba-technical IRC channel on irc.freenode.net.

If you do report problems then please try to send high quality
feedback. If you don't provide vital information to help us track down
the problem then you will probably be ignored.  All bug reports should
be filed under the "Samba 4.1 and newer" product in the project's Bugzilla
database (https://bugzilla.samba.org/).


======================================================================
== Our Code, Our Bugs, Our Responsibility.
== The Samba Team
======================================================================


================
Download Details
================

The uncompressed tarballs and patch files have been signed
using GnuPG (ID 6568B7EA).  The source code can be downloaded
from:

        https://download.samba.org/pub/samba/stable/
        https://download.samba.org/pub/samba/rc/

Patches addressing this defect have been posted to

        https://www.samba.org/samba/history/security.html

The release notes are available online at:

        https://www.samba.org/samba/history/samba-4.3.6.html
        https://www.samba.org/samba/history/samba-4.2.9.html
        https://www.samba.org/samba/history/samba-4.1.23.html
        https://download.samba.org/pub/samba/rc/samba-4.4.0rc4.WHATSNEW.txt

Our Code, Our Bugs, Our Responsibility.
(https://bugzilla.samba.org/)

                        --Enjoy
                        The Samba Team

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