The remote host is missing an update to ruby1.9 announced via advisory USN-805-1.

The problem can be corrected by upgrading your system to the following package versions: Ubuntu 6.06 LTS: libruby1.8 1.8.4-1ubuntu1.7 ruby1.8 1.8.4-1ubuntu1.7 Ubuntu 8.04 LTS: libruby1.8 1.8.6.111-2ubuntu1.3 ruby1.8 1.8.6.111-2ubuntu1.3 Ubuntu 8.10: libruby1.8 1.8.7.72-1ubuntu0.2 libruby1.9 1.9.0.2-7ubuntu1.2 ruby1.8 1.8.7.72-1ubuntu0.2 ruby1.9 1.9.0.2-7ubuntu1.2 Ubuntu 9.04: libruby1.8 1.8.7.72-3ubuntu0.1 libruby1.9 1.9.0.2-9ubuntu1.1 ruby1.8 1.8.7.72-3ubuntu0.1 ruby1.9 1.9.0.2-9ubuntu1.1 In general, a standard system upgrade is sufficient to effect the necessary changes. https://secure1.securityspace.com/smysecure/catid.html?in=USN-805-1

It was discovered that Ruby did not properly validate certificates. An attacker could exploit this and present invalid or revoked X.509 certificates. (CVE-2009-0642) It was discovered that Ruby did not properly handle string arguments that represent large numbers. An attacker could exploit this and cause a denial of service. (CVE-2009-1904)