The remote host is missing an update to postgresql-8.3 announced via advisory USN-753-1.
Details follow:
It was discovered that PostgreSQL did not properly handle encoding conversion failures. An attacker could exploit this by sending specially crafted requests to PostgreSQL, leading to a denial of service.
Solution: The problem can be corrected by upgrading your system to the following package versions:
This update uses a new upstream release, which includes additional bug fixes. In general, a standard system upgrade is sufficient to effect the necessary changes.