Local/SCAN Listener – Enhancing Security (Oracle Security Alert)

Recently we discovered  a possible vulnerability on SCAN Listener,  so we opened   SR  and Oracle give us a solution.

I recommend all apply this security. “As far as I know only the availability can be affected, none concern about data integrity” .

Thread: How prevent REMOTE LISTENER register on SCAN LISTENER

Oracle Security Alert for CVE-2012-1675

This security alert addresses the security issue CVE-2012-1675, a vulnerability in the TNS listener which has been recently disclosed as “TNS Listener Poison Attack” affecting the Oracle Database Server. This vulnerability may be remotely exploitable without authentication, i.e. it may be exploited over a network without the need for a username and password. A remote user can exploit this vulnerability to impact the confidentiality, integrity and availability of systems that do not have recommended solution applied.

Affected Products and Versions
Oracle Database 11g Release 2, versions,
Oracle Database 11g Release 1, version
Oracle Database 10g Release 2, versions,,


Recommendations for protecting against this vulnerability can be found at:

Please note that Oracle has added Oracle Advanced Security SSL/TLS to the Oracle Database Standard Edition license when used with the Real Application Clusters and Oracle has added Oracle Advanced Security SSL/TLS to the Enterprise Edition Real Application Clusters (Oracle RAC) and RAC One Node options so that the directions provided in the Support Notes referenced above can be applied by all Oracle customers without additional cost.

Note: Please refer to the Oracle licensing documentation available on Oracle.com regarding licensing changes that allow Oracle Advanced Security SSL/TLS to be used with Oracle SE Oracle Real Application Clusters and Oracle Enterprise Edition Real Application Customers (Oracle RAC) and Oracle RAC OneNode Options.

Due to the threat posed by a successful attack, Oracle strongly recommends that customers apply this Security Alert solution as soon as possible.




One Comment on “Local/SCAN Listener – Enhancing Security (Oracle Security Alert)”

  1. suhail says:

    really a good bolg ….

    thanks for the post


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