[ GLSA 200501-23 ] Exim: Two buffer overflows

From: Matthias Geerdsen (vorlon_at_gentoo.org)
Date: 01/12/05

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    Date: Wed, 12 Jan 2005 23:01:30 +0100
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    Gentoo Linux Security Advisory GLSA 200501-23
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                                                http://security.gentoo.org/
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      Severity: High
         Title: Exim: Two buffer overflows
          Date: January 12, 2005
          Bugs: #76893
            ID: 200501-23

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    Synopsis
    ========

    Buffer overflow vulnerabilities, which could lead to arbitrary code
    execution, have been found in the handling of IPv6 addresses as well
    as in the SPA authentication mechanism in Exim.

    Background
    ==========

    Exim is an highly configurable message transfer agent (MTA) developed
    at the University of Cambridge.

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

        -------------------------------------------------------------------
         Package / Vulnerable / Unaffected
        -------------------------------------------------------------------
      1 mail-mta/exim < 4.43-r2 >= 4.43-r2

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

    Buffer overflows have been found in the host_aton() function
    (CAN-2005-0021) as well as in the spa_base64_to_bits() function
    (CAN-2005-0022), which is part of the SPA authentication code.

    Impact
    ======

    A local attacker could trigger the buffer overflow in host_aton() by
    supplying an illegal IPv6 address with more than 8 components, using a
    command line option. The second vulnerability could be remotely
    exploited during SPA authentication, if it is enabled on the server.
    Both buffer overflows can potentially lead to the execution of
    arbitrary code.

    Workaround
    ==========

    There is no known workaround at this time.

    Resolution
    ==========

    All Exim users should upgrade to the latest version:

        # emerge --sync
        # emerge --ask --oneshot --verbose ">=mail-mta/exim-4.43-r2"

    References
    ==========

      [ 1 ] Exim Announcement
            http://www.exim.org/mail-archives/exim-announce/2005/msg00000.html
      [ 2 ] CAN-2005-0021
            http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0021
      [ 3 ] CAN-2005-0022
            http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0022

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

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

      http://security.gentoo.org/glsa/glsa-200501-23.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 2005 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/2.0

    
    



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