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VuXML IDDescription
3d95c9a7-7d5c-11e3-a8c1-206a8a720317ntpd DRDoS / Amplification Attack using ntpdc monlist command

ntp.org reports:

Unrestricted access to the monlist feature in ntp_request.c in ntpd in NTP before 4.2.7p26 allows remote attackers to cause a denial of service (traffic amplification) via forged (1) REQ_MON_GETLIST or (2) REQ_MON_GETLIST_1 requests, as exploited in the wild in December 2013

Use noquery to your default restrictions to block all status queries.

Use disable monitor to disable the ``ntpdc -c monlist'' command while still allowing other status queries.


Discovery 2014-01-01
Entry 2014-01-14
Modified 2016-08-09
ntp
< 4.2.7p26

FreeBSD
ge 8.3 lt 8.3_14

ge 8.4 lt 8.4_7

ge 9.1 lt 9.1_10

ge 9.2 lt 9.2_3

CVE-2013-5211
SA-14:02.ntpd
http://support.ntp.org/bin/view/Main/SecurityNotice#DRDoS_Amplification_Attack_using