Debian: DSA-1948-1 Critical Denial Of Service Fix For NTP Service

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.


For the oldstable distribution (etch), this problem has been fixed in
version 1:4.2.2.p4+dfsg-2etch4.

For the stable distribution (lenny), this problem has been fixed in
version 1:4.2.4p4+dfsg-8lenny3.

For the testing (squeeze) and unstable (sid) distribution, this problem
will be fixed soon.


We recommend that you upgrade your ntp packages.

Upgrade instructions
- --------------------

wget url
will fetch the file for you
dpkg -i file.deb
will inst...