samba announce - Dec 2015 - [Announce] Samba 4.3.3, 4.2.7, 4.1.22 and ldb 1.1.24 Security Releases Available for Download

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

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

o  CVE-2015-7540 (Remote DoS in Samba (AD) LDAP server)
o  CVE-2015-3223 (Denial of service in Samba Active Directory
		  server)
o  CVE-2015-5252 (Insufficient symlink verification in smbd)
o  CVE-2015-5299 (Missing access control check in shadow copy
		  code)
o  CVE-2015-5296 (Samba client requesting encryption vulnerable
		  to downgrade attack)
o  CVE-2015-8467 (Denial of service attack against Windows
		  Active Directory server)
o  CVE-2015-5330 (Remote memory read in Samba LDAP server)

Please note that if building against a system libldb, the required
version has been bumped to ldb-1.1.24.  This is needed to ensure
we build against a system ldb library that contains the fixes
for CVE-2015-5330 and CVE-2015-3223.

======Details
======
o  CVE-2015-7540:
   All versions of Samba from 4.0.0 to 4.1.21 inclusive are vulnerable to
   an anonymous memory exhaustion attack in the samba daemon LDAP server.

   A malicious client can send packets that cause the LDAP server provided
   by the AD DC in the samba daemon process to consume unlimited memory
   and be terminated.

o  CVE-2015-3223:
   All versions of Samba from 4.0.0 to 4.3.2 inclusive (resp. all
   ldb versions up to 1.1.23 inclusive) are vulnerable to
   a denial of service attack in the samba daemon LDAP server.

   A malicious client can send packets that cause the LDAP server in the
   samba daemon process to become unresponsive, preventing the server
   from servicing any other requests.

   This flaw is not exploitable beyond causing the code to loop expending
   CPU resources.

o  CVE-2015-5252:
   All versions of Samba from 3.0.0 to 4.3.2 inclusive are vulnerable to
   a bug in symlink verification, which under certain circumstances could
   allow client access to files outside the exported share path.

   If a Samba share is configured with a path that shares a common path
   prefix with another directory on the file system, the smbd daemon may
   allow the client to follow a symlink pointing to a file or directory
   in that other directory, even if the share parameter "wide links"
is
   set to "no" (the default).

o  CVE-2015-5299:
   All versions of Samba from 3.2.0 to 4.3.2 inclusive are vulnerable to
   a missing access control check in the vfs_shadow_copy2 module. When
   looking for the shadow copy directory under the share path the current
   accessing user should have DIRECTORY_LIST access rights in order to
   view the current snapshots.

   This was not being checked in the affected versions of Samba.

o  CVE-2015-5296:
   Versions of Samba from 3.2.0 to 4.3.2 inclusive do not ensure that
   signing is negotiated when creating an encrypted client connection to
   a server.

   Without this a man-in-the-middle attack could downgrade the connection
   and connect using the supplied credentials as an unsigned, unencrypted
   connection.

o  CVE-2015-8467:
   Samba, operating as an AD DC, is sometimes operated in a domain with a
   mix of Samba and Windows Active Directory Domain Controllers.

   All versions of Samba from 4.0.0 to 4.3.2 inclusive, when deployed as
   an AD DC in the same domain with Windows DCs, could be used to
   override the protection against the MS15-096 / CVE-2015-2535 security
   issue in Windows.

   Prior to MS16-096 it was possible to bypass the quota of machine
   accounts a non-administrative user could create.  Pure Samba domains
   are not impacted, as Samba does not implement the
   SeMachineAccountPrivilege functionality to allow non-administrator
   users to create new computer objects.

o  CVE-2015-5330:
   All versions of Samba from 4.0.0 to 4.3.2 inclusive (resp. all
   ldb versions up to 1.1.23 inclusive) are vulnerable to
   a remote memory read attack in the samba daemon LDAP server.

   A malicious client can send packets that cause the LDAP server in the
   samba daemon process to return heap memory beyond the length of the
   requested value.

   This memory may contain data that the client should not be allowed to
   see, allowing compromise of the server.

   The memory may either be returned to the client in an error string, or
   stored in the database by a suitabily privileged user.  If untrusted
   users can create objects in your database, please confirm that all DN
   and name attributes are reasonable.


#######################################
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/

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-4.3.3.html
        https://www.samba.org/samba/history/samba-4.2.7.html
        https://www.samba.org/samba/history/samba-4.1.22.html

The uncompressed ldb tarball has been signed using GnuPG (ID 13084025).
The ldb-1.1.24 source code can be downloaded from:

        https://download.samba.org/pub/ldb/ldb-1.1.24.tar.gz

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

                        --Enjoy
                        The Samba Team

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