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://sourceforge.net/mailarchive/message.php?msg_name=alpine.DEB.2.00.1012011542220.12930%40familiar.castaglia.org http://secunia.com/advisories/42449
http://www.vuxml.org/freebsd/ed7fa1b4-ff59-11df-9759-080027284eaa.html
Insight
The following package is affected: proftpd
