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             AUSCERT External Security Bulletin Redistribution

                               ESB-2014.0841
                Potential DOS in Samba internal DNS server
                                29 May 2014

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

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

Product:           Samba
Publisher:         The Samba Team
Operating System:  UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2014-0239  

Original Bulletin: 
   http://www.samba.org/samba/security/CVE-2014-0239

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CVE-2014-0239.html:

===========================================================
== Subject:     Potential DOS in Samba internal DNS server
==
== CVE ID#:     CVE-2014-0239
==
== Versions:    All versions of Samba later than 4.0.0
==
== Summary:     The internal DNS server does not check the "reply" flag,
==		potentially causing a packet loop.
==
===========================================================

===========
Description
===========

Samba versions 4.0.0 and above have a flaw in DNS protocol handling in the
internal DNS server. The server will not check the "reply" flag in the DNS
packet header when processing a request. That makes it vulnerable to reply
to a spoofed reply packet with another reply. Two affected servers could thus
DOS each other.

==================
Patch Availability
==================

Patches addressing this issue have been posted to:

    http://www.samba.org/samba/security/

Samba version 4.0.18 includes a patch for this issue.

==========
Workaround
==========

Use the BIND_DLZ DNS backend to avoid this issue.

=======
Credits
=======

This problem was reported on IRC by a Samba user

Patch provided by Kai Blin of the Samba team.

==========================================================
== Our Code, Our Bugs, Our Responsibility.
== The Samba Team
==========================================================

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