full-disclosure - [ GLSA 200407-21 ] Samba: Multiple buffer overflows

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From: klieber at gentoo.org (Kurt Lieber)
Subject: [ GLSA 200407-21 ] Samba: Multiple buffer overflows

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Gentoo Linux Security Advisory                           GLSA 200407-21
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                                            http://security.gentoo.org/
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  Severity: High
     Title: Samba: Multiple buffer overflows
      Date: July 29, 2004
      Bugs: #57962
        ID: 200407-21

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Synopsis
========

Two buffer overflows vulnerabilities were found in Samba, potentially
allowing the remote execution of arbitrary code.

Background
==========

Samba is a package which allows *nix systems to act as file servers for
Windows computers. It also allows *nix systems to mount shares exported
by a Samba/CIFS/Windows server. The Samba Web Administration Tool
(SWAT) is a web-based configuration tool part of the Samba package.

Affected packages
=================

    -------------------------------------------------------------------
     Package       /   Vulnerable   /                       Unaffected
    -------------------------------------------------------------------
  1  net-fs/samba       >= 3.0.5                           <= 3.0.4-r1

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

Evgeny Demidov found a buffer overflow in SWAT, located in the base64
data decoder used to handle HTTP basic authentication (CAN-2004-0600).
The same flaw is present in the code used to handle the sambaMungedDial
attribute value, when using the ldapsam passdb backend. Another buffer
overflow was found in the code used to support the 'mangling method =
hash' smb.conf option (CAN-2004-0686). Note that the default Samba
value for this option is 'mangling method = hash2' which is not
vulnerable.

Impact
======

The SWAT authentication overflow could be exploited to execute
arbitrary code with the rights of the Samba daemon process. The
overflow in the sambaMungedDial handling code is not thought to be
exploitable. The buffer overflow in 'mangling method = hash' code could
also be used to execute arbitrary code on vulnerable configurations.

Workaround
==========

Users disabling SWAT, not using ldapsam passdb backends and not using
the 'mangling method = hash' option are not vulnerable.

Resolution
==========

All Samba users should upgrade to the latest version:

    # emerge sync

    # emerge -pv ">=net-fs/samba-3.0.5"
    # emerge ">=net-fs/samba-3.0.5"

References
==========

  [ 1 ] Samba 3.0.5 Release Notes
        http://www.samba.org/samba/whatsnew/samba-3.0.5.html
  [ 2 ] CAN-2004-0600
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0600
  [ 3 ] CAN-2004-0686
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0686

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

    http://security.gentoo.org/glsa/glsa-200407-21.xml

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
security@...too.org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2004 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/1.0
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