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A  U  S  C  E  R  T                                           A  L  E  R  T

                       AL-2007.0126 -- AUSCERT ALERT
                               [UNIX/Linux]
                 Samba: Buffer overrun in send_mailslot()
                             11 December 2007

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

        AusCERT Alert Summary
        ---------------------

Product:              Samba 3.0.0 to 3.0.27a
Publisher:            The Samba Team
Operating System:     UNIX variants (UNIX, Linux, OSX)
Impact:               Execute Arbitrary Code/Commands
Access:               Remote/Unauthenticated
CVE Names:            CVE-2007-6015

Original Bulletin:    http://samba.org/samba/security/CVE-2007-6015.html

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==========================================================
==
== Subject:     Boundary failure in GETDC mailslot
==              processing can result in a buffer overrun
==
== CVE ID#:     CVE-2007-6015
==
== Versions:    Samba 3.0.0 - 3.0.27a (inclusive)
==
== Summary:     Specifically crafted GETDC mailslot requests
==              can trigger a boundary error in the domain
==              controller GETDC mail slot support which
==              can be remotely exploited to execute arbitrary
==              code.
==
==========================================================

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

Secunia Research reported a vulnerability that allows for
the execution of arbitrary code in nmbd.  This defect is
only be exploited when the "domain logons" parameter has
been enabled in smb.conf.


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

A patch addressing this defect has been posted to

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

Additionally, Samba 3.0.28 has been issued as a security
release to correct the defect.


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

Samba administrators may avoid this security issue by disabling
both the "domain logons" options in the server's smb.conf file.
Note that this will disable all domain controller features as
well.


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

This vulnerability was reported to Samba developers by
Alin Rad Pop, Secunia Research.

The time line is as follows:

* Nov 22, 2007: Initial report to security@samba.org.
* Nov 22, 2007: First response from Samba developers confirming
  the bug along with a proposed patch.
* Dec 10, 2007: Public security advisory made available.


==========================================================
== Our Code, Our Bugs, Our Responsibility.
== The Samba Team
==========================================================
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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

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