[Samba] [Announce] Samba 4.6.8, 4.5.14 and 4.4.16 Security Releases Available

[Arjit Gupta]

Hi Team,

Workaround for
CVE-2017-12151 :- client max protocol = NT1 and
CVE-2017-12163 :-  server min protocol = SMB2_02

are contradicting to each other.

CVE-2017-12151 impacts on SMB3 protocol but workaound suggst to use NT1.
I have below queries regarding this.

Is SMB2 protocol also impacted by CVE-2017-12151 ?
Can i use  client max protocol = SMB2 so that it does not contradict with
workaround of  CVE-2017-12163 ?


Arjit Kumar


On Wed, Sep 20, 2017 at 1:37 PM, Karolin Seeger via samba-technical <
samba-technical at lists.samba.org> wrote:

> Release Announcements
> ---------------------
>
> These are security releases in order to address the following defects:
>
> o  CVE-2017-12150 (SMB1/2/3 connections may not require signing where they
>    should)
> o  CVE-2017-12151 (SMB3 connections don't keep encryption across DFS
> redirects)
> o  CVE-2017-12163 (Server memory information leak over SMB1)
>
>
> =======
> Details
> =======
>
> o  CVE-2017-12150:
>    A man in the middle attack may hijack client connections.
>
> o  CVE-2017-12151:
>    A man in the middle attack can read and may alter confidential
>    documents transferred via a client connection, which are reached
>    via DFS redirect when the original connection used SMB3.
>
> o  CVE-2017-12163:
>    Client with write access to a share can cause server memory contents to
> be
>    written into a file or printer.
>
> For more details and workarounds, please see the security advisories:
>
>    o https://www.samba.org/samba/security/CVE-2017-12150.html
>    o https://www.samba.org/samba/security/CVE-2017-12151.html
>    o https://www.samba.org/samba/security/CVE-2017-12163.html
>
>
> Changes:
> --------
>
> o  Jeremy Allison <jra at samba.org>
>    * BUG 12836: s3: smbd: Fix a read after free if a chained SMB1 call goes
>      async.
>    * BUG 13020: CVE-2017-12163: s3:smbd: Prevent client short SMB1 write
> from
>      writing server memory to file.
>
> o  Ralph Boehme <slow at samba.org>
>    * BUG 12885: s3/smbd: Let non_widelink_open() chdir() to directories
>      directly.
>
> o  Stefan Metzmacher <metze at samba.org>
>    * BUG 12996: CVE-2017-12151: Keep required encryption across SMB3 dfs
>      redirects.
>    * BUG 12997: CVE-2017-12150: Some code path don't enforce smb signing
>      when they should.
>
>
> #######################################
> 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-4.6.8.html
>         https://www.samba.org/samba/history/samba-4.5.14.html
>         https://www.samba.org/samba/history/samba-4.4.16.html
>
> Our Code, Our Bugs, Our Responsibility.
> (https://bugzilla.samba.org/)
>
>                         --Enjoy
>                         The Samba Team
>