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ntpd DRDoS / Amplification Attack using ntpdc monlist command

Description:

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.

References:

Affects:

portaudit: ntpd DRDoS / Amplification Attack using ntpdc monlist command

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If you have found a vulnerability in a FreeBSD port not listed in the database, please contact the FreeBSD Security Team. Refer to "FreeBSD Security Information" for more information.


Oliver Eikemeier <eik@FreeBSD.org>