2.1.2 Ensure 'extproc' Is Not Present in 'listener.ora'
Information
'extproc' should be removed from the 'listener.ora' to mitigate the risk that OS libraries can be invoked by the Oracle instance. Rationale: 'extproc' allows the database to run procedures from OS libraries. These library calls can, in turn, run any OS command.
Solution
To remediate this recommendation: Remove 'extproc' from the 'listener.ora' file.