| The panic_gate check in NTP before 4.2.8p5 is only re-enabled after
the first change to the system clock that was greater than 128
milliseconds by default, which allows remote attackers to set NTP to
an arbitrary time when started with the -g option, or to alter the
time by up to 900 seconds otherwise by responding to an unspecified
number of requests from trusted sources, and leveraging a resulting
denial of service (abort and restart).
|