The remote host is missing an update to libgsf announced via advisory USN-391-1.
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:
A heap overflow was discovered in the OLE processing code in libgsf. If a user were tricked into opening a specially crafted OLE document, an attacker could execute arbitrary code with the user's privileges.
Solution: The problem can be corrected by upgrading your system to the following package versions:
Ubuntu 5.10: libgsf-1 1.12.3-3ubuntu3.1
Ubuntu 6.06 LTS: libgsf-1-113 1.13.99-0ubuntu2.1
Ubuntu 6.10: libgsf-1-114 1.14.1-2ubuntu1.1
After a standard system upgrade you need to restart your desktop session to effect the necessary changes.