[Full-disclosure] [ GLSA 200511-23 ] chmlib, KchmViewer: Stack-based buffer overflow

From: Thierry Carrez (koon_at_gentoo.org)
Date: 11/28/05

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    Date: Mon, 28 Nov 2005 11:18:47 +0100
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    Gentoo Linux Security Advisory GLSA 200511-23
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                                                http://security.gentoo.org/
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      Severity: Normal
         Title: chmlib, KchmViewer: Stack-based buffer overflow
          Date: November 28, 2005
          Bugs: #110557
            ID: 200511-23

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    Synopsis
    ========

    chmlib and KchmViewer contain a buffer overflow vulnerability which may
    lead to the execution of arbitrary code.

    Background
    ==========

    chmlib is a library for dealing with Microsoft ITSS and CHM format
    files. KchmViewer is a CHM viewer that includes its own copy of the
    chmlib library.

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

        -------------------------------------------------------------------
         Package / Vulnerable / Unaffected
        -------------------------------------------------------------------
      1 app-doc/chmlib < 0.37.4 >= 0.37.4
      2 app-doc/kchmviewer < 1.1 >= 1.1
        -------------------------------------------------------------------
         2 affected packages on all of their supported architectures.
        -------------------------------------------------------------------

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

    Sven Tantau reported about a buffer overflow vulnerability in chmlib.
    The function "_chm_decompress_block()" does not properly perform
    boundary checking, resulting in a stack-based buffer overflow.

    Impact
    ======

    By convincing a user to open a specially crafted ITSS or CHM file,
    using KchmViewer or a program makes use of chmlib, a remote attacker
    could execute arbitrary code with the privileges of the user running
    the software.

    Workaround
    ==========

    There is no known workaround at this time.

    Resolution
    ==========

    All chmlib users should upgrade to the latest version:

        # emerge --sync
        # emerge --ask --oneshot --verbose ">=app-doc/chmlib-0.37.4"

    All KchmViewer users should upgrade to the latest version:

        # emerge --sync
        # emerge --ask --oneshot --verbose ">=app-doc/kchmviewer-1.1"

    References
    ==========

      [ 1 ] CVE-2005-3318
            http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-3318

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

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

      http://security.gentoo.org/glsa/glsa-200511-23.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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