Ubuntu Security Notice 930-3 - USN-930-1 fixed vulnerabilities in Firefox. Due to a software packaging problem, the Firefox 3.6 update could not be installed when the firefox-2 package was also installed. This update fixes the problem and updates apturl for the change. If was discovered that Firefox could be made to access freed memory. A flaw was discovered in the way plugin instances interacted. An integer overflow was discovered in Firefox. Martin Barbella discovered an integer overflow in an XSLT node sorting routine. Michal Zalewski discovered that the focus behavior of Firefox could be subverted. Ilja van Sprundel discovered that the 'Content-Disposition: attachment' HTTP header was ignored when 'Content-Type: multipart' was also present.
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