KOffice shared libraries: Heap corruption — GLSA 200612-05

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

Affected Packages

app-office/koffice-libs on all architectures
Affected versions < 1.5.0
Unaffected versions >= 1.5.0

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.

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

Release Date
December 10, 2006

Latest Revision
December 10, 2006: 01

Severity
normal

Exploitable
remote

Bugzilla entries