The remote host is missing an update to ntp announced via advisory USN-777-1.

The problem can be corrected by upgrading your system to the following package versions: Ubuntu 6.06 LTS: ntp 1:4.2.0a+stable-8.1ubuntu6.2 ntp-server 1:4.2.0a+stable-8.1ubuntu6.2 Ubuntu 8.04 LTS: ntp 1:4.2.4p4+dfsg-3ubuntu2.2 Ubuntu 8.10: ntp 1:4.2.4p4+dfsg-6ubuntu2.3 Ubuntu 9.04: ntp 1:4.2.4p4+dfsg-7ubuntu5.1 In general, a standard system upgrade is sufficient to effect the necessary changes. https://secure1.securityspace.com/smysecure/catid.html?in=USN-777-1

A stack-based buffer overflow was discovered in ntpq. If a user were tricked into connecting to a malicious ntp server, a remote attacker could cause a denial of service in ntpq, or possibly execute arbitrary code with the privileges of the user invoking the program. (CVE-2009-0159) Chris Ries discovered a stack-based overflow in ntp. If ntp was configured to use autokey, a remote attacker could send a crafted packet to cause a denial of service, or possible execute arbitrary code. (CVE-2009-1252)