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

[GLSA]

Gentoo Linux Security Advisory

Title: KOffice shared libraries: Heap corruption (GLSA 200612-05)
Severity: normal
Exploitable: remote
Date: December 10, 2006
Bug(s): #155914
ID: 200612-05

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: app-office/koffice-libs
Vulnerable: < 1.5.0
Unaffected: >= 1.5.0
Architectures: All supported architectures


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: