full-disclosure - [ GLSA 200407-11 ] wv: Buffer overflow vulnerability

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From: koon at gentoo.org (Thierry Carrez)
Subject: [ GLSA 200407-11 ] wv: Buffer overflow vulnerability

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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@...too.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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