SeaMonkey is an open source Web browser, email and newsgroup client, IRCchat client, and HTML editor.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-2009-3979)A flaw was found in the SeaMonkey NT Lan Manager (NTLM) authenticationprotocol implementation. If an attacker could trick a local user that hasNTLM credentials into visiting a specially-crafted web page, they couldsend arbitrary requests, authenticated with the user's NTLM credentials, toother applications on the user's system. (CVE-2009-3983)A flaw was found in the way SeaMonkey displayed the SSL location barindicator. An attacker could create an unencrypted web page that appearsto be encrypted, possibly tricking the user into believing they arevisiting a secure page. (CVE-2009-3984)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.