Summary
The remote host is missing an update to the system as announced in the referenced advisory.
Solution
Update your system with the appropriate patches or software upgrades.
http://www.joomla.org/content/view/1841/78/
http://www.vuxml.org/freebsd/0ab423e7-3822-11db-81e1-000e0c2e438a.html
Insight
The following package is affected: joomla