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FreeBSD-SA-10:02.ntpd Security Advisory
The FreeBSD Project
Topic: ntpd mode 7 denial of service
Category: contrib
Module: ntpd
Announced: 2010-01-06
Affects: All supported versions of FreeBSD.
Robin Park and Dmitri Vinokurov discovered that the daemon component of
the ntp package, a reference implementation of the NTP protocol, is
not properly reacting to certain incoming packets.
An unexpected NTP mode 7 packets (MODE_PRIVATE) with spoofed IP data can lead
ntpd to reply with a mode 7 response to the spoofed address. This may result
in the service playing packet ping-pong with other ntp servers or even itself
which causes CPU usage and excessive disk use due to logging. An attacker
can use this to conduct denial of service attacks.
necessary changes.
Details follow:
Robin Park and Dmitri Vinokurov discovered a logic error in ntpd. A remote
attacker could send a crafted NTP mode 7 packet with a spoofed IP address
of an affected server and cause a denial of service via CPU and disk
resource consumption.
Updated packages for Ubuntu 6.06 LTS:
