The remote host is missing an update to xorg announced via advisory USN-341-1.
A security issue affects the following Ubuntu releases:
Ubuntu 5.04 Ubuntu 5.10 Ubuntu 6.06 LTS
This advisory also applies to the corresponding versions of Kubuntu, Edubuntu, and Xubuntu.
An integer overflow has been discovered in X.org's font handling library. By using a specially crafted font file, this could be exploited to crash the X server or execute arbitrary code with root privileges.
Solution: The problem can be corrected by upgrading your system to the following package versions: