ESB-2017.2398 - ALERT [UNIX/Linux][Ubuntu] samba: Multiple vulnerabilities 2017-09-22

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.2398
                           Samba vulnerabilities
                             22 September 2017

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           samba
Publisher:         Ubuntu
Operating System:  Ubuntu
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Access Privileged Data         -- Remote/Unauthenticated
                   Provide Misleading Information -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-12163 CVE-2017-12151 CVE-2017-12150

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3426-1

Comment: This advisory references vulnerabilities in products which run on 
         platforms other than Ubuntu. It is recommended that administrators 
         running samba check for an updated version of the software for their
         operating system.

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Ubuntu Security Notice USN-3426-1
September 21, 2017

samba vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- - Ubuntu 17.04
- - Ubuntu 16.04 LTS
- - Ubuntu 14.04 LTS

Summary:

Samba could be made to expose sensitive information over the network.

Software Description:
- - samba: SMB/CIFS file, print, and login server for Unix

Details:

Stefan Metzmacher discovered that Samba incorrectly enforced SMB signing in
certain situations. A remote attacker could use this issue to perform a man
in the middle attack. (CVE-2017-12150)

Stefan Metzmacher discovered that Samba incorrectly handled encryption
across DFS redirects. A remote attacker could use this issue to perform a
man in the middle attack. (CVE-2017-12151)

Yihan Lian and Zhibin Hu discovered that Samba incorrectly handled memory
when SMB1 is being used. A remote attacker could possibly use this issue to
obtain server memory contents. (CVE-2017-12163)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 17.04:
  samba                           2:4.5.8+dfsg-0ubuntu0.17.04.7

Ubuntu 16.04 LTS:
  samba                           2:4.3.11+dfsg-0ubuntu0.16.04.11

Ubuntu 14.04 LTS:
  samba                           2:4.3.11+dfsg-0ubuntu0.14.04.12

In general, a standard system update will make all the necessary changes.

References:
  https://www.ubuntu.com/usn/usn-3426-1
  CVE-2017-12150, CVE-2017-12151, CVE-2017-12163

Package Information:
  https://launchpad.net/ubuntu/+source/samba/2:4.5.8+dfsg-0ubuntu0.17.04.7
  https://launchpad.net/ubuntu/+source/samba/2:4.3.11+dfsg-0ubuntu0.16.04.11
  https://launchpad.net/ubuntu/+source/samba/2:4.3.11+dfsg-0ubuntu0.14.04.12

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===========================================================================
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