FreeBSD VuXML: Documenting security issues in FreeBSD and the FreeBSD Ports Collection

ntpd DRDoS / Amplification Attack using ntpdc monlist command

Affected packages
		ntp	<	4.2.7p26
8.3	<=	FreeBSD	<	8.3_14
8.4	<=	FreeBSD	<	8.4_7
9.1	<=	FreeBSD	<	9.1_10
9.2	<=	FreeBSD	<	9.2_3

Details

VuXML ID	3d95c9a7-7d5c-11e3-a8c1-206a8a720317
Discovery	2014-01-01
Entry	2014-01-14
Modified	2016-08-09

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.

[source]

References

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