The remote host is missing an update to xterm announced via advisory DSA 1694-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201694-1

Paul Szabo discovered that xterm, a terminal emulator for the X Window System, places arbitrary characters into the input buffer when displaying certain crafted escape sequences (CVE-2008-2383). As an additional precaution, this security update also disables font changing, user-defined keys, and X property changes through escape sequences. For the stable distribution (etch), this problem has been fixed in version 222-1etch3. For the unstable distribution (sid), this problem will be fixed soon. We recommend that you upgrade your xterm package.