The remote host is missing an update to ruby-gnome2 announced via advisory DSA 1431-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201431-1

It was discovered that ruby-gnome2, GNOME-related bindings for the Ruby language, didn't properly sanitize input prior to constructing dialogs. This could allow for the execution of arbitary code if untrusted input is displayed within a dialog. For the stable distribution (etch), this problem has been fixed in version 0.15.0-1.1etch1. For the old stable distribution (sarge), this problem has been fixed in version 0.12.0-2sarge1. For the unstable distribution (sid), this problem has been fixed in version 0.16.0-10. We recommend that you upgrade your ruby-gnome2 package.