Vulnerability (Informational: HTTP PE Download) Blocked

Received Norton message "Vulnerability (Informational: HTTP PE Download) Blocked" two days ago.

Was running under Mac OS 10.9.4.  Last night I upgraded to OS 10.9.5 and installed the BASH patch.

Then I ran a complete Norton scan of my entire system, and it revealed a clean system with no alerts.

Am I ok, or do I need to take additional action?