mcollective -- cert valication issue

Melissa Stone reports:

The MCollective aes_security public key plugin does not correctly
validate certs against the CA. By exploiting this vulnerability
within a race/initialization window, an attacker with local access
could initiate an unauthorized MCollective client connection with a
server, and thus control the mcollective plugins running on that
server. This vulnerability requires a collective be configured to
use the aes_security plugin. Puppet Enterprise and open source
MCollective are not configured to use the plugin and are not
vulnerable by default.