[Samba] [Announce] Samba 4.6.1, 4.5.7 and 4.4.12 Security Releases Available for Download

[Karolin Seeger]

Release Announcements
---------------------

These are a security releases in order to address the following defect:

o  CVE-2017-2619 (Symlink race allows access outside share definition)

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

o  CVE-2017-2619:
   All versions of Samba prior to 4.6.1, 4.5.7, 4.4.11 are vulnerable to
   a malicious client using a symlink race to allow access to areas of
   the server file system not exported under the share definition.

   Samba uses the realpath() system call to ensure when a client requests
   access to a pathname that it is under the exported share path on the
   server file system.

   Clients that have write access to the exported part of the file system
   via SMB1 unix extensions or NFS to create symlinks can race the server
   by renaming a realpath() checked path and then creating a symlink. If
   the client wins the race it can cause the server to access the new
   symlink target after the exported share path check has been done. This
   new symlink target can point to anywhere on the server file system.

   This is a difficult race to win, but theoretically possible. Note that
   the proof of concept code supplied wins the race reliably only when
   the server is slowed down using the strace utility running on the
   server. Exploitation of this bug has not been seen in the wild.


Changes:
--------

o  Jeremy Allison <jra at samba.org>
   * BUG 12496: CVE-2017-2619: Symlink race permits opening files outside share
     directory.

o  Ralph Boehme <slow at samba.org>
   * BUG 12496: CVE-2017-2619: Symlink race permits opening files outside share
     directory.


#######################################
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 6F33915B6568B7EA).  The source code can be downloaded
from:

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

The release notes are available online at:

        https://www.samba.org/samba/history/samba-4.6.1.html
        https://www.samba.org/samba/history/samba-4.5.7.html
        https://www.samba.org/samba/history/samba-4.4.12.html

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

                        --Enjoy
                        The Samba Team
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