GLSA 200612-05 KOffice shared libraries: Heap corruption
Posted on: 12/10/2006 04:40 PM

A new security update has been released for Gentoo Linux - KOffice shared libraries: Heap corruption. Here the announcement:

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 lt; 1.5.0 gt;= 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 "gt;=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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