KOffice shared libraries: Heap corruption

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200612-05 / koffice-libs
Release Date	December 10, 2006
Latest Revision	December 10, 2006: 01
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
app-office/koffice-libs	< 1.5.0	>= 1.5.0	All supported architectures

Related bugreports: #155914

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.

2. Impact Information

Background

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

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.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

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

Code Listing 3.1: Resolution

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

4. References

CVE-2006-6120

Page updated December 10, 2006

Summary: This is a Gentoo Linux Security Advisory

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