[ GLSA 200407-21 ] Samba: Multiple buffer overflows

From: Kurt Lieber (klieber_at_gentoo.org)
Date: 07/29/04

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    Date: Thu, 29 Jul 2004 13:23:10 +0000
To: gentoo-announce@lists.gentoo.org

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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@gentoo.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

  • Next message: Len Rose: "[Full-Disclosure] Administrivia: Server instability"

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