The default configuration of JBoss does not restrict access to the (1) console and (2) web management interfaces, which allows remote attackers to bypass authentication and gain administrative access via direct requests.
http://wiki.jboss.org/wiki/Wiki.jsp?page=SecureJBoss
http://wiki.jboss.org/wiki/Wiki.jsp?page=SecureTheJmxConsole
http://www.kb.cert.org/vuls/id/632656
http://www.securityfocus.com/archive/1/460597/100/0/threaded
http://www.securityfocus.com/archive/1/460605/100/0/threaded
http://www.securityfocus.com/archive/1/460695/100/0/threaded