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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.1682
                            Samba vulnerability
                                6 July 2017

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

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

Product:           samba
Publisher:         Ubuntu
Operating System:  UNIX variants (UNIX, Linux, OSX)
                   Windows
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-9461  

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3348-1

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-3348-1
July 05, 2017

samba vulnerability
==========================================================================

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

- - Ubuntu 17.04
- - Ubuntu 16.10
- - Ubuntu 16.04 LTS
- - Ubuntu 14.04 LTS

Summary:

Samba could be made to hang if it received specially crafted network
traffic.

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

Details:

It was discovered that Samba incorrectly handled dangling symlinks. A
remote attacker could possibly use this issue to cause Samba to hang,
resulting in a denial of service. This issue only applied to Ubuntu 14.04
LTS and Ubuntu 16.04 LTS. (CVE-2017-9461)

In addition, this update fixes a regression introduced by USN-3267-1
that caused Samba to incorrectly handle non-wide symlinks to directories.

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-0ubuntu0.17.04.3

Ubuntu 16.10:
  samba                           2:4.4.5+dfsg-2ubuntu5.7

Ubuntu 16.04 LTS:
  samba                           2:4.3.11+dfsg-0ubuntu0.16.04.8

Ubuntu 14.04 LTS:
  samba                           2:4.3.11+dfsg-0ubuntu0.14.04.9

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

References:
  https://www.ubuntu.com/usn/usn-3348-1
  CVE-2017-9461

Package Information:
  https://launchpad.net/ubuntu/+source/samba/2:4.5.8+dfsg-0ubuntu0.17.04.3
  https://launchpad.net/ubuntu/+source/samba/2:4.4.5+dfsg-2ubuntu5.7
  https://launchpad.net/ubuntu/+source/samba/2:4.3.11+dfsg-0ubuntu0.16.04.8
  https://launchpad.net/ubuntu/+source/samba/2:4.3.11+dfsg-0ubuntu0.14.04.9

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===========================================================================
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The University of Queensland
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===========================================================================
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