Oracle provide a tool called the Listener Control utility (lsnrctl) to allow an Oracle DBA to remotely control the Listener. The Listener is responsible for dealing with client requests for database services. This control utility contains an indirect remotely exploitable format string vulnerability. By default the Oracle Listener is not protected against unauthenticated access and control. The configuration files of Listeners in such a state can be modified without the user needing to supply a password. By modifying certain entries in the listener.ora file, by inserting a format string exploit, an attacker can gain control of a Listener control utility.
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