Critical: thunderbird security update

An updated thunderbird package that fixes several security issues is now
available for Red Hat Enterprise Linux 4 and 5.

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.

Mozilla Thunderbird is a standalone mail and newsgroup client.

Several flaws were found in the processing of malformed HTML content.
Malicious HTML content could cause Thunderbird to crash or, potentially,
execute arbitrary code with the privileges of the user running
Thunderbird. (CVE-2011-2982)

A flaw was found in the way Thunderbird handled malformed JavaScript.
Malicious content could cause Thunderbird to access already freed memory,
causing Thunderbird to crash or, potentially, execute arbitrary code with
the privileges of the user running Thunderbird. (CVE-2011-2983)

Note: This update disables support for Scalable Vector Graphics (SVG)
images in Thunderbird on Red Hat Enterprise Linux 5.

All Thunderbird users should upgrade to this updated package, which
resolves these issues. All running instances of Thunderbird must be
restarted for the 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
https://access.redhat.com/kb/docs/DOC-11259

730518 - CVE-2011-2982 Mozilla: Miscellaneous memory safety hazards
730523 - CVE-2011-2983 Mozilla: Private data leakage using RegExp.input

https://www.redhat.com/security/data/cve/CVE-2011-2982.html
https://www.redhat.com/security/data/cve/CVE-2011-2983.html
https://access.redhat.com/security/updates/classification/#critical