[ GLSA 200612-05 ] KOffice shared libraries: Heap corruption

[Sune Kloppenborg Jeppesen <jaervosz () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 200612-05
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: KOffice shared libraries: Heap corruption
      Date: December 10, 2006
      Bugs: #155914
        ID: 200612-05

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Synopsis
========

An integer overflow in koffice-libs allows for a Denial of Service and
possibly the execution of arbitrary code when viewing malicious
PowerPoint files.

Background
==========

KOffice is an integrated office suite for KDE. koffice-libs is a
package containing shared librares used by KOffice programs.

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

    -------------------------------------------------------------------
     Package                  /  Vulnerable  /              Unaffected
    -------------------------------------------------------------------
  1  app-office/koffice-libs       < 1.5.0                    >= 1.5.0

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

Kees Cook of Ubuntu discovered that 'KLaola::readBigBlockDepot()' in
klaola.cc fills 'num_of_bbd_blocks' while reading a .ppt (PowerPoint)
file without proper sanitizing, resulting in an integer overflow
subsequently overwriting the heap with parts of the file being read.

Impact
======

By enticing a user to open a specially crafted PowerPoint file, an
attacker could crash the application and possibly execute arbitrary
code with the rights of the user running KOffice.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All koffice-libs users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=app-office/koffice-libs-1.5.0"

References
==========

  [ 1 ] CVE-2006-6120
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-6120

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

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

  http://security.gentoo.org/glsa/glsa-200612-05.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 2006 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/2.5

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