Moderate: 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 moderate
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-2011-0051, CVE-2011-0053)

Note: JavaScript support is disabled by default in Thunderbird. The above
issues are not exploitable unless JavaScript is enabled.

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
http://kbase.redhat.com/faq/docs/DOC-11259

675082 - CVE-2011-0053 Mozilla miscellaneous memory safety hazards (MFSA 2011-01)
675087 - CVE-2011-0051 Mozilla recursive eval call causes confirm dialog to evaluate to true (MFSA 2011-02)

https://www.redhat.com/security/data/cve/CVE-2011-0051.html
https://www.redhat.com/security/data/cve/CVE-2011-0053.html
https://access.redhat.com/security/updates/classification/#moderate