The remote host is missing an update to tar announced via advisory USN-385-1.
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:
Teemu Salmela discovered that tar still handled the deprecated GNUTYPE_NAMES record type. This record type could be used to create symlinks that would be followed while unpacking a tar archive. If a user or an automated system were tricked into unpacking a specially crafted tar file, arbitrary files could be overwritten with user privileges.
Solution: The problem can be corrected by upgrading your system to the following package versions:
Ubuntu 5.10: tar 1.15.1-2ubuntu0.2
Ubuntu 6.06 LTS: tar 1.15.1-2ubuntu2.1
Ubuntu 6.10: tar 1.15.91-2ubuntu0.3
In general, a standard system upgrade is sufficient to effect the necessary changes.