Oracle Security Alert for CVE-2012-1675 (TNS Listener Poison Attack)

Dears,

  I am running Oracle with the following environments :

  - 10.2.0.5 under IBM AIX 64

  - 10.2.0.5 under HP UX (ia64)

  - 10.2.0.5 under Windows Server 2008 R2 (x64 bit)

  - 10.2.0.4 under Linux x86

I read the new security alert from Oracle about Listener Posion Attack (Note 1453883.1).

I am not using RAC.

This note requires to add COST parameter to the listener.ora.

But my question is : For the above releases, is it required to apply the patch 12880299 before doing this change in Listener.ora

If yes, why I cannot see through the Metalink the availability of this patch for envirronments NON RAC

(All what I found is RAC: TCP HANDLERS BLOCK IF LISTENER REGISTRATION IS RESTRICTED TO IPC W/COST (Patch))