The remote host is missing an update to thunderbird announced via advisory USN-741-1. Several flaws were discovered in the browser engine. If Javascript were enabled, an attacker could exploit these flaws to crash Thunderbird and possibly execute arbitrary code with user privileges. (CVE-2009-0352) Jesse Ruderman and Gary Kwong discovered flaws in the browser engine. If a user had Javascript enabled, these problems could allow a remote attacker to cause a denial of service or possibly execute arbitrary code with the privileges of the user invoking the program. (CVE-2009-0772, CVE-2009-0774) Georgi Guninski discovered a flaw when Thunderbird performed a cross-domain redirect. If a user had Javascript enabled, an attacker could bypass the same-origin policy in Thunderbird by utilizing nsIRDFService and steal private data from users authenticated to the redirected website. (CVE-2009-0776)

The problem can be corrected by upgrading your system to the following package versions: Ubuntu 6.06 LTS: mozilla-thunderbird 1.5.0.13+1.5.0.15~prepatch080614k-0ubuntu0.6.06.1 Ubuntu 7.10: thunderbird 2.0.0.21+nobinonly-0ubuntu0.7.10.1 Ubuntu 8.04 LTS: thunderbird 2.0.0.21+nobinonly-0ubuntu0.8.04.1 Ubuntu 8.10: thunderbird 2.0.0.21+nobinonly-0ubuntu0.8.10.1 After a standard system upgrade you need to restart Thunderbird to effect the necessary changes. https://secure1.securityspace.com/smysecure/catid.html?in=USN-741-1