The update for Red Hat Enterprise Linux 4 fixes problems that could be exploited to bypass certain security restrictions, conduct cross-site scripting attacks, potentially disclose sensitive information or compromise a user's system.
The Red Hat Security Response Team rated the update as 'critical'.
It was found that a malicious HTML mail message could also modify the content of a different open HTML message, possibly stealing sensitive information or installing browser malware.
Red Hat users running Thunderbird are advised to upgrade to the updated package containing Thunderbird version 1.0.8, which is not vulnerable to these issues.
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