FreeBSD : ntpd DRDoS / Amplification Attack using ntpdc monlist command (3d95c9a7-7d5c-11e3-a8c1-206a8a720317)

This script is Copyright (C) 2014 Tenable Network Security, Inc.


Synopsis :

The remote FreeBSD host is missing a security-related update.

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.

See also :

http://www.nessus.org/u?58c8d5f5
http://www.nessus.org/u?ce8d1d82

Solution :

Update the affected package.

Risk factor :

Medium / CVSS Base Score : 5.0
(CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P)
CVSS Temporal Score : 4.3
(CVSS2#E:ND/RL:OF/RC:C)
Public Exploit Available : true

Family: FreeBSD Local Security Checks

Nessus Plugin ID: 71960 ()

Bugtraq ID: 64692

CVE ID: CVE-2013-5211