The remote host is missing an update to nas announced via advisory USN-446-1.
A security issue affects the following Ubuntu releases:
Ubuntu 5.10 Ubuntu 6.06 LTS Ubuntu 6.10
This advisory also applies to the corresponding versions of Kubuntu, Edubuntu, and Xubuntu.
Details follow:
Luigi Auriemma discovered multiple flaws in the Network Audio System server. Remote attackers could send specially crafted network requests that could lead to a denial of service or execution of arbitrary code. Note that default Ubuntu installs do not include the NAS server.
Solution: The problem can be corrected by upgrading your system to the following package versions:
Ubuntu 5.10: nas 1.7-2ubuntu2.1
Ubuntu 6.06 LTS: nas 1.7-3ubuntu3.2
Ubuntu 6.10: nas 1.8-2ubuntu0.1
In general, a standard system upgrade is sufficient to effect the necessary changes.