Moderate: tk security update

Updated tk packages that fix a security issue are now available for Red Hat
Enterprise Linux 4.

This update has been rated as having moderate security impact by the Red
Hat Security Response Team.

[Updated 22 February 2008]
The packages in this errata were originally pushed to the wrong Red Hat
Network channels and were not available to all users. We have updated this
errata with the correct channels.

Tk is a graphical toolkit for the Tcl scripting language.

An input validation flaw was discovered in Tk's GIF image handling. A
code-size value read from a GIF image was not properly validated before
being used, leading to a buffer overflow. A specially crafted GIF file
could use this to cause a crash or, potentially, execute code with the
privileges of the application using the Tk graphical toolkit.
(CVE-2008-0553)

A buffer overflow flaw was discovered in Tk's animated GIF image handling.
An animated GIF containing an initial image smaller than subsequent images
could cause a crash or, potentially, execute code with the privileges of
the application using the Tk library. (CVE-2007-5378)

All users are advised to upgrade to these updated packages which contain a
backported patches to resolve these issues.

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

This update is available via Red Hat Network. Details on how to use
the Red Hat Network to apply this update are available at
http://kbase.redhat.com/faq/FAQ_58_10188

332021 - CVE-2007-5378 Tk GIF processing buffer overflow
431518 - CVE-2008-0553 tk: GIF handling buffer overflow

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-5378
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-0553
http://www.redhat.com/security/updates/classification/#moderate