(RHSA-2011:0311) Critical: thunderbird security update

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-2010-1585, CVE-2011-0053, CVE-2011-0062)

A flaw was found in the way Thunderbird handled malformed JPEG images. An
HTML mail message containing a malicious JPEG image could cause
Thunderbird to crash or, potentially, execute arbitrary code with the
privileges of the user running Thunderbird. (CVE-2011-0061)

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.