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HTTPServerILServlet.java in JMS over HTTP Invocation Layer of the JbossMQ implementation (jbossmq-httpil.sar, which is enabled by default in Red Hat Jboss Applicatino Server <= Jboss 4.X) does not restrict the classes for which it performs deserialization, which allows remote attackers to execute arbitrary code via crafted serialized data.
Acknowledgments: Name: Joao Filho Matos Figueiredo
Statement: JBoss 4.x is not supported by Red Hat