The remote host is missing an update to globus-gridftp-server announced via advisory DSA 2523-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%202523-1

It was discovered that the GridFTP component from the Globus Toolkit, a toolkit used for building Grid systems and applications performed insufficient validation of a name lookup, which could lead to privilege escalation. For the stable distribution (squeeze), this problem has been fixed in version 3.23-1+squeeze1 of the globus-gridftp-server source package and in version 0.43-1+squeeze1 of the globus-gridftp-server-control source package For the testing distribution (wheezy) and the unstable distribution (sid), this problem has been fixed in version 6.5-1. We recommend that you upgrade your globus-gridftp-server packages.