Security Advisory Critical: kdelibs security update

Advisory: RHSA-2012:1418-2
Type: Security Advisory
Severity: Critical
Issued on: 2012-10-30
Last updated on: 2013-02-21
Affected Products: Red Hat Enterprise Linux Desktop (v. 6)
Red Hat Enterprise Linux HPC Node (v. 6)
Red Hat Enterprise Linux Server (v. 6)
Red Hat Enterprise Linux Workstation (v. 6)
CVEs ( CVE-2012-4512


Updated kdelibs packages that fix two security issues are now available for
Red Hat Enterprise Linux 6 FasTrack.

The Red Hat Security Response Team has rated this update as having critical
security impact. Common Vulnerability Scoring System (CVSS) base scores,
which give detailed severity ratings, are available for each vulnerability
from the CVE links in the References section.

[Updated 21st February 2013]
Packages previously available in this erratum were moved to RHBA-2013:0553
to prevent this erratum from incorrectly showing as a security update to
users that do not enable FasTrack channels and who had previously received
these security fixes via RHSA-2012:1416.

The kdelibs packages provide libraries for the K Desktop Environment
(KDE). Konqueror is a web browser.

A heap-based buffer overflow flaw was found in the way the CSS (Cascading
Style Sheets) parser in kdelibs parsed the location of the source for font
faces. A web page containing malicious content could cause an application
using kdelibs (such as Konqueror) to crash or, potentially, execute
arbitrary code with the privileges of the user running the application.

A heap-based buffer over-read flaw was found in the way kdelibs calculated
canvas dimensions for large images. A web page containing malicious content
could cause an application using kdelibs to crash or disclose portions of
its memory. (CVE-2012-4513)

Users should upgrade to these updated packages, which contain backported
patches to correct these issues. The desktop must be restarted (log out,
then log back in) for this update to take effect.


Before applying this update, make sure all previously-released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at

Updated packages

(The unlinked packages above are only available from the Red Hat Network)

Bugs fixed (see bugzilla for more information)

865741 - CVE-2012-4513 kdelibs: Heap-based buffer over-read when calculating dimensions of the canvas within the scale loop
865779 - CVE-2012-4512 kdelibs: Heap-based buffer overflow when parsing location of a font face source


These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from:

The Red Hat security contact is More contact details at