14.1. Securing the Oracle Listener
The role of the TNS listener in an Oracle environment cannot be overstated. In fact, it is arguably one of the most critical elements in any Oracle environment. From a security standpoint, it is easily the most important. Yet, in spite of all this, it remains one of the least understood.
For many, listener configuration consists of little more than clicking a few selections in the netca utility. Afterward, testing usually consists of connecting from a remote workstation. Beyond that, little thought is given to the listener.
What they don't realize is that, in its default configuration, the Oracle listener presents an enormous security risk. The listener can be compromised in a number of ways, allowing attackers ...
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