The remote host is missing an update to cupsys announced via advisory USN-780-1.

The problem can be corrected by upgrading your system to the following package versions: Ubuntu 6.06 LTS: cupsys 1.2.2-0ubuntu0.6.06.14 Ubuntu 8.04 LTS: cupsys 1.3.7-1ubuntu3.5 Ubuntu 8.10: cups 1.3.9-2ubuntu9.2 Ubuntu 9.04: cups 1.3.9-17ubuntu3.1 In general, a standard system upgrade is sufficient to effect the necessary changes. https://secure1.securityspace.com/smysecure/catid.html?in=USN-780-1

Anibal Sacco discovered that CUPS did not properly handle certain network operations. A remote attacker could exploit this flaw and cause the CUPS server to crash, resulting in a denial of service.