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 mail content.
An HTML mail message containing malicious content could cause Thunderbird
to crash or, potentially, execute arbitrary code with the privileges of the
user running Thunderbird. (CVE-2010-3176, CVE-2010-3180)

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

A flaw was found in the script that launches Thunderbird. The
LD_LIBRARY_PATH variable was appending a "." character, which could allow a
local attacker to execute arbitrary code with the privileges of a different
user running Thunderbird, if that user ran Thunderbird from within an
attacker-controlled directory. (CVE-2010-3182)

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

642272 - CVE-2010-3176 Mozilla miscellaneous memory safety hazards
642283 - CVE-2010-3180 Mozilla use-after-free error in nsBarProp
642300 - CVE-2010-3182 Mozilla unsafe library loading flaw

https://www.redhat.com/security/data/cve/CVE-2010-3176.html
https://www.redhat.com/security/data/cve/CVE-2010-3180.html
https://www.redhat.com/security/data/cve/CVE-2010-3182.html
http://www.redhat.com/security/updates/classification/#moderate