SeaMonkey is an open source web browser, email and newsgroup client, IRCchat client, and HTML editor.A flaw was found in the way SeaMonkey handled dialog boxes. An attackercould use this flaw to create a malicious web page that would present ablank dialog box that has non-functioning buttons. If a user closes thedialog box window, it could unexpectedly grant the malicious web pageelevated privileges. (CVE-2011-0051)Several flaws were found in the processing of malformed web content. A webpage containing malicious content could cause SeaMonkey to crash or,potentially, execute arbitrary code with the privileges of the user runningSeaMonkey. (CVE-2011-0053)A flaw was found in the way SeaMonkey handled plug-ins that perform HTTPrequests. If a plug-in performed an HTTP request, and the server sent a 307redirect response, the plug-in was not notified, and the HTTP request wasforwarded. The forwarded request could contain custom headers, which couldresult in a Cross Site Request Forgery attack. (CVE-2011-0059)All SeaMonkey users should upgrade to these updated packages, which correctthese issues. After installing the update, SeaMonkey must be restarted forthe changes to take effect.