GLSA 200407-11 - wv: Buffer overflow vulnerability
Posted on: 07/14/2004 07:32 AM

A wv update has been released for Gentoo Linux

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Gentoo Linux Security Advisory GLSA 200407-11
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
http://security.gentoo.org/
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Severity: Normal
Title: wv: Buffer overflow vulnerability
Date: July 14, 2004
Bugs: #56595
ID: 200407-11

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

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=115type=vulnerabilitiesflashstatus=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 license under the Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/1.0


Printed from Linux Compatible (http://www.linuxcompatible.org/news/story/glsa_200407_11__wv_buffer_overflow_vulnerability.html)