[ GLSA 200407-11 ] wv: Buffer overflow vulnerability

From: Thierry Carrez (koon_at_gentoo.org)
Date: 07/14/04

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    Gentoo Linux Security Advisory GLSA 200407-11
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                                                http://security.gentoo.org/
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      Severity: Normal
         Title: wv: Buffer overflow vulnerability
          Date: July 14, 2004
          Bugs: #56595
            ID: 200407-11

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    Synopsis
    ========

    A buffer overflow vulnerability exists in the wv library that can allow
    an attacker to execute arbitrary code with the privileges of the user
    running the vulnerable application.

    Background
    ==========

    The wv library allows access to MS Word files. It can parse Word files
    and allow other applications, such as abiword, to import those files
    into their native formats.

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

        -------------------------------------------------------------------
         Package / Vulnerable / Unaffected
        -------------------------------------------------------------------
      1 app-text/wv < 1.0.0-r1 >= 1.0.0-r1

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

    A use of strcat without proper bounds checking leads to an exploitable
    buffer overflow. The vulnerable code is executed when wv encounters an
    unrecognized token, so a specially crafted file, loaded in wv, can
    trigger the vulnerable code and execute it's own arbitrary code. This
    exploit is only possible when the user loads the document into HTML
    view mode.

    Impact
    ======

    By inducing a user into running wv on a special file, an attacker can
    execute arbitrary code with the permissions of the user running the
    vulnerable program.

    Workaround
    ==========

    Users should not view untrusted documents with wvHtml or applications
    using wv. When loading an untrusted document in an application using
    the wv library, make sure HTML view is disabled.

    Resolution
    ==========

    All users should upgrade to the latest available version.

        # emerge sync

        # emerge -pv ">=app-text/wv-1.0.0-r1"
        # emerge ">=app-text/wv-1.0.0-r1"

    References
    ==========

      [ 1 ] iDEFENSE Security Advisory

    http://www.idefense.com/application/poi/display?id=115&type=vulnerabilities&flashstatus=true

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

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

        http://security.gentoo.org/glsa/glsa-200407-11.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

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