[Full-Disclosure] [ GLSA 200405-06 ] libpng denial of service vulnerability

From: Thierry Carrez (koon_at_gentoo.org)
Date: 05/14/04

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    Date: Fri, 14 May 2004 21:25:43 +0200
    
    

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    Gentoo Linux Security Advisory GLSA 200405-06
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                                                http://security.gentoo.org/
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      Severity: Normal
         Title: libpng denial of service vulnerability
          Date: May 14, 2004
          Bugs: #49887
            ID: 200405-06

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    Synopsis
    ========

    A bug in the libpng library can be abused to crash programs making use
    of that library to decode PNG images.

    Background
    ==========

    libpng is a standard library used to process PNG (Portable Network
    Graphics) images.

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

        -------------------------------------------------------------------
         Package / Vulnerable / Unaffected
        -------------------------------------------------------------------
      1 media-libs/libpng <= 1.2.5-r4 >= 1.2.5-r5

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

    libpng provides two functions (png_chunk_error and png_chunk_warning)
    for default error and warning messages handling. These functions do not
    perform proper bounds checking on the provided message, which is
    limited to 64 bytes. Programs linked against this library may crash
    when handling a malicious PNG image.

    Impact
    ======

    This vulnerability could be used to crash various programs using the
    libpng library, potentially resulting in a denial of service attack on
    vulnerable daemon processes.

    Workaround
    ==========

    There is no known workaround at this time. All users are advised to
    upgrade to the latest available version of libpng.

    Resolution
    ==========

    All users of libpng should upgrade to the latest stable version:

        # emerge sync

        # emerge -pv ">=media-libs/libpng-1.2.5-r5"
        # emerge ">=media-libs/libpng-1.2.5-r5"

    You should also run revdep-rebuild to rebuild any packages that depend
    on older versions of libpng :

        # revdep-rebuild

    References
    ==========

      [ 1 ] CAN-2004-0421
            http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0421

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

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

         http://security.gentoo.org/glsa/glsa-200405-06.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 Technologies, 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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