JBoss Web Services Native is a web service framework included as part of JBoss Enterprise Application Platform. It implements the JAX-WS specification.
It was found that JBoss Web Services Native did not properly protect against recursive entity resolution when processing Document Type Definitions (DTD). A remote attacker could exploit this flaw by sending a specially-crafted HTTP POST request to a deployed web service, causing excessive CPU and memory consumption on the system hosting that service. If the attack is repeated to consume all available network sockets, the server will become unavailable. (CVE-2011-1483)
All users of JBoss Enterprise Application Platform 4.3 as provided from the Red Hat Customer Portal are advised to install this update.