(RHSA-2006:0735) Critical: thunderbird security update

Mozilla Thunderbird is a standalone mail and newsgroup client.

Several flaws were found in the way Thunderbird processes certain malformed
Javascript code. A malicious HTML mail message could cause the execution of
Javascript code in such a way that could cause Thunderbird to crash or
execute arbitrary code as the user running Thunderbird. (CVE-2006-5463,
CVE-2006-5747, CVE-2006-5748)

Several flaws were found in the way Thunderbird renders HTML mail messages.
A malicious HTML mail message could cause the mail client to crash or
possibly execute arbitrary code as the user running Thunderbird.
(CVE-2006-5464)

A flaw was found in the way Thunderbird verifies RSA signatures. For RSA
keys with exponent 3 it is possible for an attacker to forge a signature
that would be incorrectly verified by the NSS library. Thunderbird as
shipped trusts several root Certificate Authorities that use exponent 3. An
attacker could have created a carefully crafted SSL certificate which would
be incorrectly trusted when their site was visited by a victim. This flaw
was previously thought to be fixed in Thunderbird 1.5.0.7, however Ulrich
Kuehn discovered the fix was incomplete (CVE-2006-5462)

Users of Thunderbird are advised to upgrade to this update, which contains
Thunderbird version 1.5.0.8 that corrects these issues.