ntpd: DoS with mode 7 packets (VU#568372)

ntprequest.c in ntpd in NTP before 4.2.4p8, and 4.2.5, allows remote attackers to cause a denial of service CPU and bandwidth consumption by using MODEPRIVATE to send a spoofed 1 request or 2 response packet that triggers a continuous exchange of MODEPRIVATE error responses between two NTP daemon...