samba - Mar 2018 - [Announce] Samba 4.7.6, 4.6.14 and 4.5.16 Security Releases Available for Download

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

These are security release in order to address the following defects:

o  CVE-2018-1050 (Denial of Service Attack on external print server.) 
o  CVE-2018-1057 (Authenticated users can change other users' password.)


======Details
======
o  CVE-2018-1050:
   All versions of Samba from 4.0.0 onwards are vulnerable to a denial of
   service attack when the RPC spoolss service is configured to be run as
   an external daemon. Missing input sanitization checks on some of the
   input parameters to spoolss RPC calls could cause the print spooler
   service to crash.

   There is no known vulnerability associated with this error, merely a
   denial of service. If the RPC spoolss service is left by default as an
   internal service, all a client can do is crash its own authenticated
   connection.

o  CVE-2018-1057:
   On a Samba 4 AD DC the LDAP server in all versions of Samba from
   4.0.0 onwards incorrectly validates permissions to modify passwords
   over LDAP allowing authenticated users to change any other users'
   passwords, including administrative users.

   Possible workarounds are described at a dedicated page in the Samba wiki:
   https://wiki.samba.org/index.php/CVE-2018-1057


Changes:
--------

o  Jeremy Allison <jra at samba.org>
   * BUG 11343: CVE-2018-1050: Codenomicon crashes in spoolss server code.

o  Ralph Boehme <slow at samba.org>
   * BUG 13272: CVE-2018-1057: Unprivileged user can change any user (and admin)
     password.

o  Stefan Metzmacher <metze at samba.org>
   * BUG 13272: CVE-2018-1057: Unprivileged user can change any user (and admin)
     password.


#######################################
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-4.7.6.html
        https://www.samba.org/samba/history/samba-4.6.14.html
        https://www.samba.org/samba/history/samba-4.5.16.html

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

                        --Enjoy
                        The Samba Team
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Under what conditions are "server services = -ldap" an acceptable
workaround? would it work with a standalone AD with file sharing done
by other Samba servers?


On Tue, Mar 13, 2018 at 5:20 AM, Karolin Seeger via samba-technical
<samba-technical at lists.samba.org> wrote:
> Release Announcements
> ---------------------
>
> These are security release in order to address the following defects:
>
> o  CVE-2018-1050 (Denial of Service Attack on external print server.)
> o  CVE-2018-1057 (Authenticated users can change other users'
password.)
>
>
> ======> Details
> ======>
> o  CVE-2018-1050:
>    All versions of Samba from 4.0.0 onwards are vulnerable to a denial of
>    service attack when the RPC spoolss service is configured to be run as
>    an external daemon. Missing input sanitization checks on some of the
>    input parameters to spoolss RPC calls could cause the print spooler
>    service to crash.
>
>    There is no known vulnerability associated with this error, merely a
>    denial of service. If the RPC spoolss service is left by default as an
>    internal service, all a client can do is crash its own authenticated
>    connection.
>
> o  CVE-2018-1057:
>    On a Samba 4 AD DC the LDAP server in all versions of Samba from
>    4.0.0 onwards incorrectly validates permissions to modify passwords
>    over LDAP allowing authenticated users to change any other users'
>    passwords, including administrative users.
>
>    Possible workarounds are described at a dedicated page in the Samba
wiki:
>    https://wiki.samba.org/index.php/CVE-2018-1057
>
>
> Changes:
> --------
>
> o  Jeremy Allison <jra at samba.org>
>    * BUG 11343: CVE-2018-1050: Codenomicon crashes in spoolss server code.
>
> o  Ralph Boehme <slow at samba.org>
>    * BUG 13272: CVE-2018-1057: Unprivileged user can change any user (and
admin)
>      password.
>
> o  Stefan Metzmacher <metze at samba.org>
>    * BUG 13272: CVE-2018-1057: Unprivileged user can change any user (and
admin)
>      password.
>
>
> #######################################
> 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-4.7.6.html
>         https://www.samba.org/samba/history/samba-4.6.14.html
>         https://www.samba.org/samba/history/samba-4.5.16.html
>
> Our Code, Our Bugs, Our Responsibility.
> (https://bugzilla.samba.org/)
>
>                         --Enjoy
>                         The Samba Team

On Tue, 2018-03-13 at 09:26 -0400, Sonic via samba-technical
wrote:
> Under what conditions are "server services = -ldap" an acceptable
> workaround? would it work with a standalone AD with file sharing done
> by other Samba servers?
I wrote that part, but sadly I didn't get time to research the full
implications, which is why it is so vague.  It really will depend on
the network.  Samba's winbindd avoids talking to ldap if you don't
enumerate users, so it may work if you 'just' have a member file server
and nothing else.  

It isn't hard to turn back on if things break, and hopefully you can
upgrade Samba fairly swiftly.

Sorry I can't be more clear on this,

Andrew Bartlett
-- 
Andrew Bartlett                       http://samba.org/~abartlet/
Authentication Developer, Samba Team  http://samba.org
Samba Developer, Catalyst IT          http://catalyst.net.nz/services/samba