An updated thunderbird package that fixes one security issue is now available for Red Hat Enterprise Linux 6. The Red Hat Security Response Team has rated this update as having critical security impact. A Common Vulnerability Scoring System (CVSS) base score,

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====================================================================                   Red Hat Security Advisory

Synopsis:          Critical: thunderbird security update
Advisory ID:       RHSA-2012:0140-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2012:0140.html
Issue date:        2012-02-16
CVE Names:         CVE-2011-3026 
====================================================================
1. Summary:

An updated thunderbird package that fixes one security issue is now
available for Red Hat Enterprise Linux 6.

The Red Hat Security Response Team has rated this update as having critical
security impact. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available from the CVE link in
the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64
Red Hat Enterprise Linux Server Optional (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64

3. Description:

Mozilla Thunderbird is a standalone mail and newsgroup client.

A heap-based buffer overflow flaw was found in the way Thunderbird handled
PNG (Portable Network Graphics) images. An HTML mail message or remote
content containing a specially-crafted PNG image could cause Thunderbird to
crash or, possibly, execute arbitrary code with the privileges of the user
running Thunderbird. (CVE-2011-3026)

All Thunderbird users should upgrade to this updated package, which
corrects this issue. After installing the update, Thunderbird must be
restarted for the changes to take effect.

4. Solution:

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
https://access.redhat.com/kb/docs/DOC-11259

5. Bugs fixed (http://bugzilla.redhat.com/):

790737 - CVE-2011-3026 libpng: Heap-buffer-overflow in png_decompress_chunk

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:

i386:
thunderbird-3.1.18-2.el6_2.i686.rpm
thunderbird-debuginfo-3.1.18-2.el6_2.i686.rpm

x86_64:
thunderbird-3.1.18-2.el6_2.x86_64.rpm
thunderbird-debuginfo-3.1.18-2.el6_2.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 6):

Source:

i386:
thunderbird-3.1.18-2.el6_2.i686.rpm
thunderbird-debuginfo-3.1.18-2.el6_2.i686.rpm

ppc64:
thunderbird-3.1.18-2.el6_2.ppc64.rpm
thunderbird-debuginfo-3.1.18-2.el6_2.ppc64.rpm

s390x:
thunderbird-3.1.18-2.el6_2.s390x.rpm
thunderbird-debuginfo-3.1.18-2.el6_2.s390x.rpm

x86_64:
thunderbird-3.1.18-2.el6_2.x86_64.rpm
thunderbird-debuginfo-3.1.18-2.el6_2.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:

i386:
thunderbird-3.1.18-2.el6_2.i686.rpm
thunderbird-debuginfo-3.1.18-2.el6_2.i686.rpm

x86_64:
thunderbird-3.1.18-2.el6_2.x86_64.rpm
thunderbird-debuginfo-3.1.18-2.el6_2.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and 
details on how to verify the signature are available from
https://access.redhat.com/security/team/key#package

7. References:

https://access.redhat.com/security/cve/CVE-2011-3026
https://access.redhat.com/security/updates/classification#critical

8. Contact:

The Red Hat security contact is .  More contact
details at https://access.redhat.com/security/team/contact

Copyright 2012 Red Hat, Inc.
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